Ultramicropore Engineering by Dehydration to Enable Molecular Sieving of H2 by Calcium Trimesate
作者：
Mukherjee, Soumya;Chen, Shoushun;Bezrukov, Andrey A.;Mostrom, Matthew;Terskikh, Victor V.;...
期刊：
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION ,2020年59(37):16188-16194 ISSN：1433-7851
通讯作者：
Zaworotko, Michael J.;Huang, Yining
作者机构：
[Mukherjee, Soumya; Chen, Shoushun; Wang, Shi-Qiang; Zaworotko, Michael J.; Kumar, Amrit; Bezrukov, Andrey A.] Univ Limerick, Bernal Inst, Dept Chem Sci, Limerick V94 T9PX, Ireland.;[Chen, Shoushun; Huang, Yining] Univ Western Ontario, Dept Chem, London, ON N6A 5B7, Canada.;[Mostrom, Matthew; Franz, Douglas; Space, Brian] Univ S Florida, Dept Chem, 4202 East Fowler Ave,CH E205, Tampa, FL 33620 USA.;[Terskikh, Victor V.] Univ Ottawa, Dept Chem, Ottawa, ON K1N 6N5, Canada.;[Chen, Mansheng] Hengyang Normal Univ, Key Lab Funct Organomet Mat, Coll Chem & Mat Sci, Hengyang 421008, Hunan, Peoples R China.
通讯机构：
[Zaworotko, Michael J.; Huang, Yining] U;Univ Limerick, Bernal Inst, Dept Chem Sci, Limerick V94 T9PX, Ireland.;Univ Western Ontario, Dept Chem, London, ON N6A 5B7, Canada.
关键词：
crystal engineering;hydrogen;physisorption;porous materials;size-sieving
摘要：
The high energy footprint of commodity gas purification and increasing demand for gases require new approaches to gas separation. Kinetic separation of gas mixtures through molecular sieving can enable separation by molecular size or shape exclusion. Physisorbents must exhibit the right pore diameter to enable separation, but the 0.3–0.4 nm range relevant to small gas molecules is hard to control. Herein, dehydration of the ultramicroporous metal–organic framework Ca-trimesate, Ca(HBTC)⋅H2O (H3BTC=trimesic acid), bnn-1-Ca-H2O, affords a narrow pore variant, Ca(HBTC), bnn-1-Ca. Whereas bnn-1-Ca-H2O (pore diameter 0.34 nm) exhibits ultra-high CO2/N2, CO2/CH4, and C2H2/C2H4 binary selectivity, bnn-1-Ca (pore diameter 0.31 nm) offers ideal selectivity for H2/CO2 and H2/N2 under cryogenic conditions. Ca-trimesate, the first physisorbent to exhibit H2 sieving under cryogenic conditions, could be a prototype for a general approach to exert precise control over pore diameter in physisorbents. © 2020 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
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Thermal conductivity and compatibility of LaMgAl11O19/LaPO4 composites
作者：
Sun, Junbin;Niu, Linfeng;Hui, Yu;Li, Wenyi;Chen, Xiaolong* ;...
期刊：
Ceramics International ,2020年46(18):27967-27972 ISSN：0272-8842
通讯作者：
Lu, Weihong;Wang, Jinshuang;Chen, Xiaolong
作者机构：
[Sun, Junbin; Lu, Weihong; Li, Wenyi] Hengyang Normal Univ, Hunan Prov Univ Key Lab Funct Organometall Mat, Coll Chem & Mat Sci, Key Lab Funct Met Organ Cpds Hunan Prov, Hengyang 421008, Peoples R China.;[Niu, Linfeng; Wang, Jinshuang] Xinyang Normal Univ, Henan Prov Key Lab Utilisat Nonmetall Mineral Sou, Xinyang 464000, Peoples R China.;[Hui, Yu] Shenyang Acad Environm Sci, Atmospher Environm Res Ctr, Shenyang 110016, Peoples R China.;[Chen, Xiaolong] Jinan Univ, Inst Adv Wear & Corros Resistant & Funct Mat, Guangzhou 510632, Peoples R China.
通讯机构：
[Lu, Weihong] H;[Wang, Jinshuang] X;[Chen, Xiaolong] J;Hengyang Normal Univ, Hunan Prov Univ Key Lab Funct Organometall Mat, Coll Chem & Mat Sci, Key Lab Funct Met Organ Cpds Hunan Prov, Hengyang 421008, Peoples R China.;Xinyang Normal Univ, Henan Prov Key Lab Utilisat Nonmetall Mineral Sou, Xinyang 464000, Peoples R China.
关键词：
LaPO4;LaMgAl11O19;Compatibility;Thermal conductivity
摘要：
As a toughening agent, LaPO4 has been used to improve several properties of ceramics. In such applications, its compatibility with the matrix material should be considered first. In this study, the compatibility of LaPO4 and magnesium lanthanum hexa-aluminate (LaMgAl11O19, LMA) was elucidated at temperatures ranging from room temperature to 1600 °C. The compositions, thermal stabilities, thermal conductivities and microstructures of the above-mentioned materials were analysed using X-ray diffraction, thermogravimetry-differential scanning calorimetry, thermal conductivity tester and scanning electron microscopy. The results indicated that the two materials maintained a good compatibility at temperatures lower than 1600 °C. At 1600 °C, the diffusion of La was observed to alter the chemical composition of LaPO4 and accelerate its reaction with LMA, leading to the formation of LaAlO3 and magnesium lanthanum aluminium oxide, resulting in the increase of thermal conductivity. © 2020 Elsevier Ltd and Techna Group S.r.l.
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High-temperature degradation of the in-situ laser-glazed plasma sprayed LaMgAl11O19 thermal barrier coating exposed to Ca-Mg-Al-silicate deposits
作者：
Sun, Yiwei;Wu, Hengkai;Zhao, Hongxu;Chen, Xiaolong* ;Guo, Chaoqian;...
期刊：
Corrosion Science ,2020年176:108934 ISSN：0010-938X
通讯作者：
Chen, Xiaolong
作者机构：
[Wu, Hengkai; Chen, Xiaolong; Sun, Yiwei; Li, Wei; Zhao, Hongxu] Jinan Univ, Inst Adv Wear & Corros Resistant & Funct Mat, Guangzhou 510632, Peoples R China.;[Chen, Xiaolong] Natl Univ Def Technol, Sci & Technol Adv Ceram Fibers & Composites Lab, Changsha 410073, Peoples R China.;[Guo, Chaoqian; Deng, Chunming] Guangdong Inst New Mat, Natl Engn Lab Modern Mat Surface Engn Technol, Guangzhou 510651, Peoples R China.;[Guo, Chaoqian; Deng, Chunming] Guangdong Inst New Mat, Guangdong Key Lab Modern Surface Engn Technol, Guangzhou 510651, Peoples R China.;[Sun, Junbin] Hengyang Normal Univ, Hunan Prov Univ, Key Lab Funct Metal Organ Cpds Hunan Prov, Coll Chem & Mat Sci,Key Lab Funct Organometall Ma, Hengyang 421008, Peoples R China.
通讯机构：
[Chen, Xiaolong] J;Jinan Univ, Inst Adv Wear & Corros Resistant & Funct Mat, Guangzhou 510632, Peoples R China.
关键词：
Ceramic;Glass;High temperature corrosion;Oxide coatings
摘要：
High-temperature degradation of the plasma sprayed LaMA coating before and after in-situ laser-glazing under CMAS attacks at 1350 degrees C for 1 h, 12 h and 48 h was comparatively investigated. Results indicate that a dense laser-glazed top layer was successfully created in-situ for a similar to 1 mm thick LaMA coating. It behaved as a sealing layer and reservoir of Al3+, Mg2+ and La3+. Melted CMAS penetration was accordingly effectively arrested accompanied by crystallizations of the CaAl2Si2O8 anorthite, MgAl2O4 spinel and Ca2La8(SiO4)(6)O-2 apatite. CMAS-induced degradation mainly occurred near the surface of the laser-glazed dense LaMA top layer. While significant penetration of the melted CMAS along the entire thickness occurred to the as-sprayed LaMA coating without laser-glazing treatments after 48 h degradation. Ca2La8(SiO4)(6)O-2 apatite phase did not crystallize for the as-sprayed LaMA due to the much reduced local La3+ concentration in melted CMAS resulted from its porous microstructure. Effects of laser-glazing on the CMAS-induced degradation of the plasma sprayed LaMA was carefully analyzed and discussed in terms of the coating's chemical composition, microstructure and surface physical chemistry characteristics base on XRD, SEM/EDS and TEM results.
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英文
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Rapid recognition and determination of tryptophan by carbon nanotubes and molecularly imprinted polymer-modified glassy carbon electrode
作者：
Wu, Yiyong;Deng, Peihong* ;Tian, Yaling;Ding, Ziyu;Li, Guangli;...
期刊：
Bioelectrochemistry ,2020年131:107393 ISSN：1567-5394
通讯作者：
He, Quanguo;Deng, Peihong
作者机构：
[Li, Guangli; He, Quanguo; Tian, Yaling; Zuberi, Zavuga; Ding, Ziyu; Wu, Yiyong; Liu, Jun] Hunan Univ Technol, Sch Life Sci & Chem, Zhuzhou 412007, Peoples R China.;[He, Quanguo; Tian, Yaling; Ding, Ziyu; Deng, Peihong; Wu, Yiyong; Liu, Jun] Hengyang Normal Univ, Key Lab Funct Organometall Mat Hunan Prov Univ, Dept Chem & Mat Sci, Key Lab Funct Met Organ Cpds Hunan Prov, Hengyang 421008, Peoples R China.;[Zuberi, Zavuga] Nelson Mandela African Inst Sci & Technol, Sch Life Sci & Bioengn, POB 447, Arusha, Tanzania.;[Deng, Peihong] Hengyang Normal Univ, Hengyang 421008, Peoples R China.
通讯机构：
[He, Quanguo; Deng, Peihong] H;Hunan Univ Technol, Sch Life Sci & Chem, Zhuzhou 412007, Peoples R China.;Hengyang Normal Univ, Hengyang 421008, Peoples R China.
关键词：
Molecularly imprinting;Multi-walled carbon nanotubes;Tryptophan;Voltammetric sensor
摘要：
A tryptophan (Trp) molecularly imprinted electrochemical sensor was fabricated by drop-coating an imprinted chitosan film on the surface of a glassy carbon electrode modified with multi-walled carbon nanotubes (MIP-MWCNTs/GCE). The surface morphology and electrochemical properties of the MIP-MWCNTs/GCE were characterized by scanning electron microscopy (SEM) and cyclic voltammetry (CV), respectively. The formation of hydrogen bonds between the functional polymer and the template molecule was confirmed by infrared spectroscopy. The electrochemical performance of the MIP-MWCNTs/GCE with Trp showed that the signal of the oxidation current of Trp obtained with MIP-MWCNTs/GCE was significantly enhanced relative to that of the uncovered GCE, indicating that the modified electrode can accelerate electron transfer and has strong selectivity for Trp. The experimental conditions were optimized in parallel, and under the optimal conditions, the MIP-MWCNTs/GCE showed a good linear relationship between the Trp oxidation peak current and Trp concentrations in the ranges of 2.0 nM–0.2 μM, 0.2 μM–10 μM and 10 μM–100 μM The limit of detection (LOD) was 1.0 nM (S/N = 3), and the modified electrode had good reproducibility and stability. Finally, the MIP-MWCNTs/GCE was successfully applied to the determination of Trp in the human serum samples. © 2019
语种：
英文
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Novel hierarchical sea urchin-like Prussian blue@palladium core–shell heterostructures supported on nitrogen-doped reduced graphene oxide: Facile synthesis and excellent guanine sensing performance
作者：
Li, Junhua;Jiang, Jianbo;Zhao, Dan;Xu, Zhifeng;Liu, Mengqin;...
期刊：
Electrochimica Acta ,2020年330:135196 ISSN：0013-4686
通讯作者：
Qian, Dong
作者机构：
[Liu, Xing; Liu, Mengqin; Xu, Zhifeng; Li, Junhua] Hengyang Normal Univ, Coll Chem & Mat Sci, Hunan Prov Univ Key Lab Funct Organometall Mat, Key Lab Funct Met Organ Cpds Hunan Prov, Hengyang 421008, Peoples R China.;[Li, Junhua; Zhao, Dan; Qian, Dong] Cent S Univ, Coll Chem & Chem Engn, Hunan Prov Key Lab Efficient & Clean Utilizat Man, Changsha 410083, Hunan, Peoples R China.;[Jiang, Jianbo] Jishou Univ, Coll Chem & Chem Engn, Jishou 416000, Peoples R China.;[Tong, Haixia] Changsha Univ Sci & Technol, Inst Chem & Biol Engn, Changsha 410114, Hunan, Peoples R China.
通讯机构：
[Qian, Dong] C;Cent S Univ, Coll Chem & Chem Engn, Hunan Prov Key Lab Efficient & Clean Utilizat Man, Changsha 410083, Hunan, Peoples R China.
关键词：
Prussian blue;Palladium;Morphology-controlled synthesis;Electrochemical detection;Guanine
摘要：
Aiming at substantially improving the electrochemical sensing performance for guanine, we bring out a novel high-efficiency electrocatalyst composed of hierarchical sea urchin-like Prussian blue@palladium core-shell heterostructures supported on nitrogen-doped reduced graphene oxide (PB-U@Pd/N-RGO). The said PB-U@Pd/N-RGO was synthesized by a new and facile wet-chemistry method without using any surfactant and template. More impressively, we demonstrate a new strategy for morphology-controlled synthesis of Prussian blue via simply tuning the ratio of N,N'-dimethyl formamide and H2O in the mixed solvent. In-depth electrochemical characterizations demonstrate the superior electrocatalytic performance of PB-U@Pd/N-RGO toward the oxidation of guanine, which benefits from the synergistic effect of component materials and its unique core-shell heterostructure. Consequently, the constructed PBU@Pd/N-RGO-based electrochemical sensor displays superb comprehensive performance for the guanine assay. To be specifical, the developed sensor exhibits wide detection range (0.01-85.0 mu W), low detection limit (2.6 nM), good reproducibility, long-term stability, high sensitivity and selectivity together with acceptable recovery (97.0-104.0%) for the assay of guanine in biological samples. Such outstanding comprehensive performance is amongst the top of reports for the electrochemical sensing of guanine, promising practical applications in biosensing fields. (C) 2019 Elsevier Ltd. All rights reserved.
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英文
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Rutheniumethynyl-Triarylamine Organic−Inorganic Mixed-Valence Systems: Regulating Ru-N Electronic Coupling by Different Aryl Bridge Cores
作者：
Ou, Ya-Ping* ;Zhang, Jing;Wang, Aihui;Yuan, Ande;Yin, Chuang;...
期刊：
CHEMISTRY-AN ASIAN JOURNAL ,2020年15(20):3338-3349 ISSN：1861-4728
通讯作者：
Ou, Ya-Ping;Liu, Sheng Hua
作者机构：
[Ou, Ya-Ping; Wang, Aihui; Yin, Chuang; Yuan, Ande] Hengyang Normal Univ, Coll Chem & Mat Sci, Key Lab Funct Met Organ Cpds Hunan Prov, Key Lab Funct Organometall Mat Hunan Prov, Hengyang 421008, Hunan, Peoples R China.;[Zhang, Jing; Liu, Sheng Hua] Cent China Normal Univ, Coll Chem, Minist Educ, Key Lab Pesticide & Chem Biol, Wuhan 430079, Peoples R China.
通讯机构：
[Ou, Ya-Ping] H;[Liu, Sheng Hua] C;Hengyang Normal Univ, Coll Chem & Mat Sci, Key Lab Funct Met Organ Cpds Hunan Prov, Key Lab Funct Organometall Mat Hunan Prov, Hengyang 421008, Hunan, Peoples R China.;Cent China Normal Univ, Coll Chem, Minist Educ, Key Lab Pesticide & Chem Biol, Wuhan 430079, Peoples R China.
关键词：
ruthenium complexes;triarylamine;electronic coupling;mixed-valence;spin density distribution
摘要：
Four rutheniumethynyl-triarylamine complexes 1–4 with different aryl bridge cores were prepared. The solid structures of complexes 2–4 were fully confirmed by X-ray single-crystal diffraction analysis. Two consecutive one-electron oxidation processes of complexes 1–4 were attributed to the ruthenium and nitrogen centers, as revealed by cyclic voltammetry and square-wave voltammogram. Results also showed decreasing potential difference ΔE of complexes 1, 3, and 4, with the largest value for 2. Upon chemical oxidation of complexes 1–4 by 1.0 eq oxidation reagents FcPF6 or AgSbF6, the mixed-valence complexes, except for 2+, show characteristic broad NIR absorptions in the UV-vis-NIR spectroscopic experiments. NIR multiple absorptions were assigned to NAr2→RuCp*(dppe) intervalence charge transfer (IVCT) and metal-to-ligand charge transfer transitions by TDDFT calculations. Coupling parameter (Hab) from Hush theory revealed that increasing electronic communication in 1+, 3+, and 4+. Electron density distribution of the HOMO for neutral molecules (1, 3, and 4) and spin density distribution of the corresponding single-oxidized states (1+, 3+, and 4+) increases progressively on the bridge as the size of the aromatic system increases, proving incremental contributions from bridge cores during oxidation. © 2020 Wiley-VCH GmbH
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英文
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Nickel Nanoparticles Supported on Nitrogen-Doped Carbon for Vanillin Detection
作者：
Nie, Xue;Deng, Peihong;Zhang, Rui;Tang, Zheng;Wang, Haiyan;...
期刊：
ACS Applied Nano Materials ,2020年3(12):11791-11800 ISSN：2574-0970
通讯作者：
Tang, Yougen
作者机构：
[Wang, Haiyan; Nie, Xue; Tang, Zheng; Zhang, Rui; Tang, Yougen] Cent South Univ, Coll Chem & Chem Engn, Changsha 410083, Peoples R China.;[Deng, Peihong; Nie, Xue] Hengyang Normal Univ, Key Lab Funct Met Organ Cpds Hunan Prov, Coll Chem & Mat Sci, Hengyang 421008, Peoples R China.;[Deng, Peihong; Nie, Xue] Hengyang Normal Univ, Key Lab Funct Organometall Mat Hunan Prov Univ, Coll Chem & Mat Sci, Hengyang 421008, Peoples R China.
通讯机构：
[Tang, Yougen] C;Cent South Univ, Coll Chem & Chem Engn, Changsha 410083, Peoples R China.
关键词：
nickel nanoparticles;nitrogen-doped carbon materials;formamide;vanillin;voltammetric determination
摘要：
We first report a simple, effective, and cost-saving method for the synthesis of nitrogen-doped carbon nanomaterials supported with the high content of nickel nanoparticles (Ni NPs/N-C) using formamide as a carbon and nitrogen source. The characterizations of morphology and structure of the Ni NPs/N-C nanomaterials were analyzed by scanning electron microscopy, transmission electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. A large number of nanotubes were formed during the pyrolysis of the product under the catalysis of nickel salt, which greatly improved the active surface area and the electronic conductivity of the materials. The Ni NPs/N-C was used as an electrode material for electrochemical detection of vanillin. The fabricated sensor enhances the electrochemical signal of vanillin and enables its rapid and accurate determination. Under the optimal measuring conditions, three linear responses were obtained at vanillin concentrations in the range of 0.04-1.0, 1.0-10, and 10-100 μM, respectively. The limit of detection was estimated to be 0.01 μM (S/N = 3). The strategy of producing this new material and its application in electroanalysis will help to fabricate highly sensitive sensors. © 2020 American Chemical Society. All rights reserved.
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英文
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Facile syntheses of bimetallic Prussian blue analogues (KxM[Fe(CN)6]·nH2O, M=Ni, Co, and Mn) for electrochemical determination of toxic 2-nitrophenol
作者：
Li, Junhua;He, Lingzhi;Jiang, Jianbo;Xu, Zhifeng;Liu, Mengqin;...
期刊：
Electrochimica Acta ,2020年353:136579 ISSN：0013-4686
通讯作者：
Qian, Dong
作者机构：
[Liu, Xing; Liu, Mengqin; Xu, Zhifeng; Li, Junhua; He, Lingzhi] Hengyang Normal Univ, Hunan Prov Univ Key Lab Funct Organometall Mat, Coll Chem & Mat Sci, Key Lab Funct Met Organ Cpds Hunan Prov, Hengyang 421008, Peoples R China.;[Li, Junhua; Qian, Dong] Cent South Univ, Coll Chem & Chem Engn, Hunan Prov Key Lab Efficient & Clean Utilizat Man, Changsha 410083, Peoples R China.;[He, Lingzhi] Hunan Polytech Environm & Biol, Sch Med, Hengyang 421008, Peoples R China.;[Jiang, Jianbo] Jishou Univ, Coll Chem & Chem Engn, Jishou 416000, Peoples R China.;[Tong, Haixia] Changsha Univ Sci & Technol, Inst Chem & Biol Engn, Changsha 410114, Peoples R China.
通讯机构：
[Qian, Dong] C;Cent South Univ, Coll Chem & Chem Engn, Hunan Prov Key Lab Efficient & Clean Utilizat Man, Changsha 410083, Peoples R China.
关键词：
Prussian blue analogues;Synthesis;Electrochemical determination;2-Nitrophenol
摘要：
In this work, three kinds of bimetallic Prussian blue analogues (PBAs), i.e. KxNi [Fe(CN)(6)]center dot nH(2)O (NiFe-PBA), KxCo [Fe(CN)(6)]center dot nH(2)O (CoFe-PBA), and KxMn [Fe(CN)(6)]center dot nH(2)O (MnFe-PBA), were synthesized by a simple precipitation method under identical conditions. Their chemical compositions, structures, morphologies, valences of transition metals, and electrochemical sensing performances for 2-nitrophenol (2-NP) are examined in details. It is found that all the prepared PBAs hold face-centered-cubic structures with near perfect cube morphologies for NiFe-PBA and CoFe-PBA and truncated cube morphology for MnFe-PBA. For the electrochemical detection of 2-NP, a wide detection range of 1.0-700.0 mu M was obtained at all PBAs modified electrodes together with the sensitivities of 443.3, 368.0, and 339.0 mu A cm(-2) mM(-1) and detection limits of 0.28, 0.46, and 0.59 mu M achieved at NiFe-PBA, CoFe-PBA, and MnFe-PBA modified electrodes, respectively. The superiority in electrochemical sensing performance of NiFe-PBA to CoFe-PBA and MnFe-PBA may stem from its higher conductivity, lager electroactive surface area, and better intrinsic catalytic property of the transition metal in its framework. Furthermore, the constructed NiFe-PBA-based sensor displays good repeatability, long-term stability, and high selectivity together with desirable recoveries (97.8-103.9%) for the assay of 2-NP in water samples. The present work is the first report on the PBAs-based electrochemical sensors for 2-NP detection, which may promise a future of PBAs or PBAs-based materials for sensing applications. (c) 2020 Elsevier Ltd. All rights reserved.
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英文
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A near infrared fluorescent probe based on ICT for monitoring mitophagy in living cells.
作者：
Tang, Wenqing;Dai, Youzhi* ;Gu, Biao;Liu, Mengqin;Yi, Zhengji;...
期刊：
ANALYST ,2020年145(4):1427-1432 ISSN：0003-2654
通讯作者：
Zeng, Rongying;Dai, Youzhi
作者机构：
[Tang, Wenqing; Li, Zhongliang] Xiangtan Univ, Sch Chem Engn, Xiangtan 411105, Hunan, Peoples R China.;[Liu, Mengqin; Gu, Biao; Zhang, Zhimin; Tang, Wenqing; He, Huiyan; Zeng, Rongying; Yi, Zhengji] Hengyang Normal Univ, Coll Chem & Mat Sci, Key Lab Funct Organometall Mat, Coll Hunan Prov, Hengyang 421008, Peoples R China.;[Dai, Youzhi] Xiangtan Univ, Coll Environm & Resources, Xiangtan 411105, Hunan, Peoples R China.;[Dai, Youzhi] Hunan 2011 Collaborat Innovat Ctr Chem Engn & Te, Xiangtan, Peoples R China.
通讯机构：
[Zeng, Rongying; Dai, Youzhi] H;[Dai, Youzhi] X;Hengyang Normal Univ, Coll Chem & Mat Sci, Key Lab Funct Organometall Mat, Coll Hunan Prov, Hengyang 421008, Peoples R China.;Xiangtan Univ, Coll Environm & Resources, Xiangtan 411105, Hunan, Peoples R China.;Hunan 2011 Collaborat Innovat Ctr Chem Engn & Te, Xiangtan, Peoples R China.
摘要：
Mitophagy, the process in which cells degrade dysfunctional organelles and recycle their nutrient substances by lysosomes, plays a vital role in cell metabolism and physiology. Herein, we present a highly targeting and near-infrared (NIR) mitochondrion fluorescent probe, which can monitor the process of autophagy. The response mechanism of the probe is based on intramolecular charge transfer (ICT) for the detection of autophagy and real-time imaging of living cells. We designed a primary amine as a pH sensitizing group, and due to the ICT process, the probe exhibits green fluorescence, and when it is protonated the ICT process is broken, and the NIR fluorescence will be restored. Simultaneously, the green fluorescence of the probe disappears. This probe exhibits excellent selectivity, high sensitivity and clean responsiveness, which indicate that it can be applied for high-targeting and high-sensitive imaging of the process of autophagy in living systems. © 2020 The Royal Society of Chemistry.
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英文
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Nitrogen-containing graphene networks with high volumetric capacitance and exceptional rate capability
作者：
Wang, Deping;Hu, Wenming;Ma, Qian;Zhang, Xuefang;Xia, Xiaohong* ;...
期刊：
Carbon ,2019年154:13-23 ISSN：0008-6223
通讯作者：
Xia, Xiaohong;Liu, Hongbo
作者机构：
[Wang, Deping] Hengyang Normal Univ, Coll Chem & Mat Sci, Hengyang 421008, Peoples R China.;[Hu, Wenming; Chen, Hui; Xia, Xiaohong; Ma, Qian; Xia, XH; Liu, HB; Zhang, Xuefang; Liu, Hongbo] Hunan Univ, Coll Mat Sci & Engn, Changsha 410082, Hunan, Peoples R China.
通讯机构：
[Xia, XH; Liu, HB] H;Hunan Univ, Coll Mat Sci & Engn, Changsha 410082, Hunan, Peoples R China.
关键词：
Graphene networks;Nitrogen-containing;Rate capability;Volumetric capacitance
摘要：
Graphene has attracted more attention as advanced electrodes for supercapacitors due to its unique geometry structure and outstanding physicochemical property. But its low specific capacitance, especially low volumetric capacitance, has greatly restricted the practical application of graphene electrode materials. Herein, we synthesized nitrogen-containing graphene networks by using 2, 3-diaminopyridine (O-DAP) as functional agent in a facile hydrothermal route. During the hydrothermal process, not only the pyrrolic-N, but also the pyrazine-N is produced in the graphene lattice at the edge/defect site of graphene because of the double –NH2 in DAP reactant. Owing to the high nitrogen content (17.5 at%), special nitrogen configuration, and high density (1.66 g cm−3), the N-containing graphene networks present high gravimetric capacitances up to 353 F g−1 and high volumetric capacitances over 586 F cm−3 in 1 M H2SO4 electrolyte. More remarkably, the N-containing graphene electrodes exhibit exceptional rate capability with a capacitance retention of 80.6% at a high current density of 20 A g−1 and good cycling stability of 91.5% retention after 5000 cycles in a symmetrical two-electrode configuration. © 2019 Elsevier Ltd
语种：
英文
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A promising sensing platform toward dopamine using MnO2 nanowires/electro-reduced graphene oxide composites
作者：
He, Quanguo;Liu, Jun;Liu, Xiaopeng;Li, Guangli* ;Chen, Dongchu;...
期刊：
Electrochimica Acta ,2019年296:683-692 ISSN：0013-4686
通讯作者：
Deng, Peihong;Li, Guangli
作者机构：
[He, Quanguo; Li, Guangli; Liang, Jing; Liu, Xiaopeng; Liu, Jun] Hunan Univ Technol, Coll Life Sci & Chem, Hunan Key Lab Biomed Nanomat & Devices, Zhuzhou 412007, Peoples R China.;[Chen, Dongchu] Foshan Univ, Sch Mat Sci & Energy Engn, Foshan 528000, Peoples R China.;[Deng, Peihong] Hengyang Normal Univ, Dept Chem & Mat Sci, 165 Huangbai Rd, Yanfeng Dist 421008, Hengyang, Peoples R China.;[Li, Guangli] Hunan Univ Technol, Coll Life Sci & Chem, 88 West Taishan Rd, Tianyuan Dist 412007, Zhuzhou, Peoples R China.
通讯机构：
[Deng, Peihong; Li, Guangli] H;Hengyang Normal Univ, Dept Chem & Mat Sci, 165 Huangbai Rd, Yanfeng Dist 421008, Hengyang, Peoples R China.;Hunan Univ Technol, Coll Life Sci & Chem, 88 West Taishan Rd, Tianyuan Dist 412007, Zhuzhou, Peoples R China.
关键词：
MnO2 nanowires;Reduced graphene oxide;Modified electrode;Dopamine sensor;Electrocatalytic oxidation
摘要：
A promising sensing platform for the ultrasensitive detection of dopamine (DA) has been constructed using MnO2 nanowires-electrochemically reduced graphene oxide modified glassy carbon electrode (MnO2 NWs-ErGO/GCE). The proposed MnO2 NWs-ErGO/GCEs had the large electrochemical active area and relative low charge transfer resistant (R-ct). As a result, the response peak current of the MnO2 NWs-ErGO is about 13 times higher than that of the bare GCE, demonstrating the remarkable electrocatalytic activity toward DA. The electrochemical kinetics revealed that DA oxidation is quasi-reversible reaction coupling with one electron and two protons. Three linear ranges (0.01 mu M - 0.10 mu M, 0.10 mu M - 1.0 mu M, and 1.0 mu M - 80 mu M) were obtained on the MnO2 NWs-ErGO/GCE, with a low detection limit of 1.0 nM (S/N = 3). Moreover, the response current was almost unaltered even in the presence of 100-fold ascorbic acid (AA) and uric acid (UA), suggesting MnO2 NWs-ErGO has good selectivity toward DA. Finally, the MnO2 NWs-ErGO/GCEs were successfully applied to detect DA in the injection solutions and human blood serum samples with high accuracy and good recovery. (C) 2018 Elsevier Ltd. All rights reserved.
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英文
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Self-supported hierarchical bead-chain graphite felt@FePO4@polyaniline: A flexible electrode for all-solid-state supercapacitors with ultrahigh energy density
作者：
Wang, Zhiyu;Shen, Miao;Liu, Tiancheng;Yang, Chunming* ;Li, Junhua;...
期刊：
Chemical Engineering Journal ,2019年361:342-352 ISSN：1385-8947
通讯作者：
Yang, Chunming;Qian, Dong
作者机构：
[Shen, Miao; Liu, Tiancheng; Yang, Chunming; Wang, Zhiyu] Hunan Normal Univ, Coll Chem & Chem Engn, Minist Educ China, Natl & Local United Engn Lab New Petrochem Mat, Changsha 410081, Hunan, Peoples R China.;[Shen, Miao; Liu, Tiancheng; Yang, Chunming; Wang, Zhiyu] Hunan Normal Univ, Coll Chem & Chem Engn, Minist Educ China, Key Lab Chem Biol & Tradit Chinese Med Res, Changsha 410081, Hunan, Peoples R China.;[Li, Junhua; Qian, Dong] Cent S Univ, Coll Chem & Chem Engn, Hunan Prov Key Lab Efficient & Clean Utilizat Man, Hunan Prov Key Lab Chem Power Resources, Changsha 410083, Hunan, Peoples R China.;[Li, Junhua] Hengyang Normal Univ, Coll Chem & Mat Sci, Key Lab Funct Met Organ Cpds Hunan Prov, Hengyang 421008, Peoples R China.;[Qian, Dong] Cent S Univ, State Key Lab Powder Met, Changsha 410083, Hunan, Peoples R China.
通讯机构：
[Yang, Chunming] H;[Qian, Dong] C;Hunan Normal Univ, Coll Chem & Chem Engn, Minist Educ China, Natl & Local United Engn Lab New Petrochem Mat, Changsha 410081, Hunan, Peoples R China.;Hunan Normal Univ, Coll Chem & Chem Engn, Minist Educ China, Key Lab Chem Biol & Tradit Chinese Med Res, Changsha 410081, Hunan, Peoples R China.;Cent S Univ, Coll Chem & Chem Engn, Hunan Prov Key Lab Efficient & Clean Utilizat Man, Hunan Prov Key Lab Chem Power Resources, Changsha 410083, Hunan, Peoples R China.
关键词：
All-solid-state flexible supercapacitors;Energy density;Graphite [email protected] 4 @polyaniline;Preparation
摘要：
The relatively low energy density of all-solid-state flexible supercapacitors (AFSCs) is the major bottleneck for their practical applications. Hence, rational designs and constructions of highly desirable hybrid electrodes with ultrahigh energy densities for AFSCs are critically important but challenging. Herein, we report a design of a novel hierarchical graphite felt (GF)@FePO4@polyaniline (PANI) bead-chain hybrid with three-dimensional networking PANI-coated FePO4 nanorods as beads and high conductive carbon fibers of GF as links. Benefiting from the robust synergistic effect between FePO4 and PANI together with plentiful conductive networks emanating from the intimate contacts among GF, FePO4 and PANI, the GF@FePO4@PANI hybrid exhibits overwhelmingly superior supercapacitive performance to GF@FePO4 and GF@PANI. More strikingly, with GF@FePO4@PANI as the binder-free electrode, the assembled symmetric AFSC device shows an ultrahigh energy density of 90.2 Wh kg−1 at a power density of 142.9 W kg−1, and 29.0 Wh kg−1 even at an elevated power density of 5714.6 W kg−1, which are amongst the top of the reported analogous flexible devices. To the best of our knowledge, this is the first report on the fabrication of GF@FePO4@PANI for AFSC applications. © 2018 Elsevier B.V.
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英文
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Self-Supported Hierarchical IrO2@NiO Nanoflake Arrays as an Efficient and Durable Catalyst for Electrochemical Oxygen Evolution
作者：
Liu, Jinlong;Wang, Zhenyu;Su, Kanda;Xv, Deyao;Zhao, Dan;...
期刊：
ACS Applied Materials & Interfaces ,2019年11(29):25854-25862 ISSN：1944-8244
通讯作者：
Qian, Dong;Yang, Chunming;Lu, Zhouguang
作者机构：
[Liu, Jinlong; Xv, Deyao; Su, Kanda; Zhao, Dan; Qian, Dong] Cent S Univ, Coll Chem & Chem Engn, Hunan Prov Key Lab Chem Power Resources, Changsha 410083, Hunan, Peoples R China.;[Yang, Chunming] Hunan Normal Univ, Coll Chem & Chem Engn, Changsha 410081, Hunan, Peoples R China.;[Liu, Jinlong] Univ Cambridge, Dept Engn, Cambridge CB3 OFA, England.;[Lu, Zhouguang; Wang, Zhenyu] South Univ Sci & Technol, Dept Mat Sci & Engn, Shenzhen 518005, Peoples R China.;[Li, Junhua] Hengyang Normal Univ, Coll Chem & Mat Sci, Key Lab Funct Met Organ Cpds Hunan Prov, Hengyang 421008, Peoples R China.
通讯机构：
[Qian, Dong] C;[Yang, Chunming] H;[Lu, Zhouguang] S;Cent S Univ, Coll Chem & Chem Engn, Hunan Prov Key Lab Chem Power Resources, Changsha 410083, Hunan, Peoples R China.;Hunan Normal Univ, Coll Chem & Chem Engn, Changsha 410081, Hunan, Peoples R China.
关键词：
iridium dioxide;nickel oxide;nanoflake array;electrocatalyst;oxygen evolution
摘要：
Although traditional IrO2 nanoparticles loaded on a carbon support (IrO2@C) have been taken as a benchmark catalyst for the oxygen evolution reaction (OER), their catalytic efficiency, operation stability, and IrO2 utilization are far from satisfactory due to the inferior powdery structure and inevitable corrosion of both IrO2 and C under the oxidizing potentials. Here, a rational design of a self-supported hierarchical nanocomposite, composed of IrO2@NiO nanoparticle-built porous nanoflake arrays vertically growing on nickel foam, is proposed, which is demonstrated as a versatile strategy to achieve improved OER activity, remarkable long-term stability, and significantly reduced loading of IrO2 (0.62 atom %). Impressively, the resultant catalyst drives a steady OER current density of 10 mA cm-2, requiring 278 mV overpotential in 1.0 M KOH electrolyte for 25 h and outmaneuvring commercial IrO2@C with much higher mass loading. Further electrochemical investigation and mechanism analysis disclose that the greatly improved electrocatalytic activity stems from the advantageous hierarchical structure and the synergistic effect between IrO2 and underlying potential-induced NiOOH, whereas the outstanding durability is attributed to the unique role of NiO in preventing IrO2 dissolution. © 2019 American Chemical Society.
语种：
英文
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Microwave assisted synthesis of disubstituted benzyltin arylformylhydrazone complexes: anticancer activity and DNA-binding properties
作者：
Jiang, Wu-Jiu* ;Zhou, Qian;Liu, Meng-Qin;Zhang, Fu-Xing;Kuang, Dai-Zhi;...
期刊：
Applied Organometallic Chemistry ,2019年33(9):ARTN e5092 ISSN：0268-2605
通讯作者：
Jiang, Wu-Jiu;Tan, Yu-Xing
作者机构：
[Jiang, WJ; Tan, Yu-Xing; Jiang, Wu-Jiu; Zhang, Fu-Xing; Kuang, Dai-Zhi; Liu, Meng-Qin] Hengyang Normal Univ, Univ Hunan Prov, Coll Chem & Mat Sci, Key Lab Funct Met Organ Cpds Hunan Prov,Key Lab F, Hengyang 421008, Hunan, Peoples R China.;[Zhou, Qian] Peking Univ, Sch Basic Med Sci, Hlth Sci Ctr, Beijing 100191, Peoples R China.
通讯机构：
[Jiang, WJ; Tan, YX] H;Hengyang Normal Univ, Univ Hunan Prov, Coll Chem & Mat Sci, Key Lab Funct Met Organ Cpds Hunan Prov,Key Lab F, Hengyang 421008, Hunan, Peoples R China.
关键词：
biological activity;crystal structure;hydrazone;organotin;synthesis
摘要：
Eight disubstituted benzyltin complexes, i.e., {[R(O)C=N-N=C (Me)COO]R'2Sn(CH3OH)}n (1a and 2b), {[R(O)C=N-N=C (Me)COO]R'2Sn(CH3OH)}2 (1b and 1d) and {[R(O)C=N-N=C (Me)COO]R'2Sn}n (1c, 2a, 2c, and 2d) (R=C4H3O-, C4H3S-, p–t-Bu-C6H4- or p-MeO-C6H4-; R'=o-Cl-C6H4CH2- or o-Me-C6H4CH2-), were prepared from the reaction of arylformylhydrazine, pyruvic acid and disubstituted benzyltin dichloride with microwave irradiation. All complexes were characterized by FT-IR spectroscopy, 1H, 13C and 119Sn NMR spectroscopy, HRMS, elemental analysis, X-ray single-crystal diffraction and TGA. The in vitro antitumour activities of all complexes were evaluated by an MTT assay against three human cancer cell lines (NCI-H460, HepG2, and MCF7). 2b exhibited strong antitumour activity on HepG2 cells and was expected to be a suitable platform for further chemical optimization to develop as anticancer therapeutics. The DNA binding of 2b was studied by UV–visible absorption spectrometry, fluorescence competitive assays, viscosity measurements and gel electrophoresis. Molecular docking was used to predict the binding between 2b and DNA, and the results show that 2b can become embedded in the double helix of DNA and cleave DNA. © 2019 John Wiley & Sons, Ltd.
语种：
英文
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Fluorescent ion-imprinted sensor for selective and sensitive detection of copper (II) ions
作者：
Xu, Zhifeng* ;Deng, Peihong;Li, Junhua;Tang, Siping
期刊：
Sensors and Actuators B-Chemical ,2018年255(Pt.2):2095-2104 ISSN：0925-4005
通讯作者：
Xu, Zhifeng
作者机构：
[Tang, Siping; Deng, Peihong; Xu, Zhifeng; Li, Junhua] Hengyang Normal Univ, Coll Chem & Mat Sci, Hengyang 421008, Peoples R China.;[Tang, Siping; Deng, Peihong; Xu, Zhifeng; Li, Junhua] Hunan Prov Univ, Key Lab Funct Organometall Mat, Hengyang 421008, Peoples R China.
通讯机构：
[Xu, Zhifeng] H;Hengyang Normal Univ, Coll Chem & Mat Sci, Hengyang 421008, Peoples R China.
关键词：
Copper (II) ion;Ion imprinted polymer;1,8-naphthalimide;Ion recognition;Fluorescence emission
摘要：
In the present study, a fluorescent ion-imprinted sensor (FIIS) for rapid and convenient detection of Cu2+ ions was fabricated. A fluorescent polymerizable ligand, i.e., 4-(2-aminomethyl)pyridine-N-allylnaphthalimide, was designed and synthesized. The FIIS was prepared by surface functionalization of PVDF membrane with a thin layer of copper (II) ion-imprinted polymer using the synthesized ligand as the fluorescent functional monomer. The intensity of fluorescence emission of FIIS decreased linearly with the increase of copper (II) ions concentration in the range of 0-70.0 mu M. The results of selectivity tests indicated that FIIS has high specific recognition ability for Cu2+ ions. The recoveries for the spiked samples were in the range of 96.4-104.4%, and the relative standard deviations (RSDs) were found to be 2.17-4.75%. The FIIS was successfully applied to the determination of copper (II) ions in real water samples. The Limits of detection (LODs) for Cu2+ ions in real water samples were in the range of 0.11-0.14 uM. The present study provided a feasible strategy for construction of fluorescent ion-imprinted sensor for convenient, sensitive and selective detection of metal ions. (C) 2017 Elsevier B.V. All rights reserved.
语种：
英文
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A reaction-based, colorimetric and near-infrared fluorescent probe for Cu2+ and its applications
作者：
Gu, Biao* ;Huang, Liyan;Xu, Zhifeng;Tan, Zhen;Hu, Meng;...
期刊：
Sensors and Actuators B-Chemical ,2018年273:118-125 ISSN：0925-4005
通讯作者：
Gu, Biao;Li, Haitao
作者机构：
[Yang, Zitun; Chen, Yanxia; Gu, Biao; Xu, Zhifeng; Huang, Liyan; Xiao, Wenpei; Peng, Cheng; Hu, Meng; Tan, Zhen] Hengyang Normal Univ, Coll Chem & Mat Sci, Key Lab Funct Organometall Mat Coll Hunan Prov, Hengyang 421008, Peoples R China.;[Yu, Donghai; Li, Haitao] Hunan Normal Univ, Coll Chem & Chem Engn, Minist Educ, Key Lab Chem Biol & Tradit Chinese Med Res, Changsha 410081, Hunan, Peoples R China.
通讯机构：
[Gu, Biao; Li, Haitao] H;Hengyang Normal Univ, Coll Chem & Mat Sci, Key Lab Funct Organometall Mat Coll Hunan Prov, Hengyang 421008, Peoples R China.;Hunan Normal Univ, Coll Chem & Chem Engn, Minist Educ, Key Lab Chem Biol & Tradit Chinese Med Res, Changsha 410081, Hunan, Peoples R China.
关键词：
Near-infrared;Colorimetric change;Cu2+;Selectivity;Fluorescence imaging
摘要：
A reaction-based near-infrared (NIR) fluorescent probe, (E)-4-(2-(4-(dicyanometh- ylene)-4H-chromen-2-yl) vinyl)phenyl picolinate (DCM-P), was designed and synthesized by employing the dicyanomethylene-4H-pyran chromophore as the fluorophore and the 2-picolinic ester group as the recognition unit. The proposed probe DCM-P showed significant NIR fluorescence "turn-on" response to Cu2+ with distinct colorimetric change from yellow to purple. The recognition mechanism of probe for Cu2+ was confirmed by fluorescence spectroscopy, H-1 NMR spectra, HAMS spectrometry and TD-DFT calculations. The probe possesses the advantages of large Stokes shift (116 nm), applicability in physiological conditions, low detection limit (2.3 x 10(-8) M), and high selectivity toward Cu2+ in presence of other metal ions. Encouraged by these desirable properties, the probe DCM-P was successfully used for quantitative determination of Cu2+ in real water samples and NIR fluorescence imaging of Cu2+ in living cells with satisfactory results.
语种：
英文
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Analyzing Gas Adsorption in an Amide-Functionalized Metal Organic Framework: Are the Carbonyl or Amine Groups Responsible?
作者：
Chen, Mansheng;Chen, Shoushun;Chen, Wei;Lucier, Bryan E. G.;Zhang, Yue;...
期刊：
CHEMISTRY OF MATERIALS ,2018年30(11):3613-3617 ISSN：0897-4756
通讯作者：
Huang, Yining
作者机构：
[Chen, Mansheng; Chen, Shoushun; Zhang, Yue; Lucier, Bryan E. G.; Huang, Yining] Univ Western Ontario, Dept Chem, London, ON N6A 5B7, Canada.;[Chen, Mansheng] Hengyang Normal Univ, Coll Chem & Mat Sci, Key Lab Funct Organometall Mat, Hengyang 421008, Hunan, Peoples R China.;[Chen, Wei; Zheng, Anmin] Chinese Acad Sci, Wuhan Inst Phys & Math, Wuhan Ctr Magnet Resonance, State Key Lab Magnet Resonance & Atom & Mol Phys, Wuhan 430071, Hubei, Peoples R China.;[Chen, Wei] Chinese Acad Sci Univ, Beijing 100049, Peoples R China.
通讯机构：
[Huang, Yining] U;Univ Western Ontario, Dept Chem, London, ON N6A 5B7, Canada.
摘要：
Gas adsorption within the prototypical amidefunctionalized metal-organic frameworks (MOF) Cu(INAIP) has been thoroughly investigated using a combination of single crystal XRD (SCXRD), solid-state NMR (SSNMR) and computational methods. SCXRD was used to locate the exact gas adsorption sites, whereas VT SSNMR spectra were able to probe the local environment about adsorbed gases across a large temperature range, yielding information on the presence and position of nearby paramagnetic metal centers. Computational methods have identified the various interactions responsible for the adsorption of gas molecules, yielding key insights into the host−gas interactions that are unavailable by direct experimental measurement. A cooperative binding model was found to exist in Cu(INAIP) in which the carbonyl group of the amide plays different roles in the adsorption of specific gas molecules, strengthening our understanding of host-gas interactions and gas adsorption in amide-functionalized MOFs.
语种：
英文
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Adsorption of Zn2+ from aqueous solutions by si-substituted carbonated hydroxylapatite: Equilibrium, kinetics, and mechanisms
作者：
Zeng, Rongying;Tang, Wenqing* ;Liu, Xing;Ding, Chunxia;Gong, Daoxin*
期刊：
ENVIRONMENTAL PROGRESS & SUSTAINABLE ENERGY ,2018年37(6):2073-2081 ISSN：1944-7442
通讯作者：
Gong, Daoxin;Tang, Wenqing
作者机构：
[Ding, Chunxia; Gong, Daoxin; Zeng, Rongying] Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Hunan, Peoples R China.;[Liu, Xing; Tang, Wenqing; Zeng, Rongying] Hengyang Normal Univ, Coll Chem & Mat Sci, Key Lab Funct Met Organ Cpds Hunan Prov, Hengyang 421008, Peoples R China.;[Liu, Xing; Tang, Wenqing; Zeng, Rongying] Hengyang Normal Univ, Coll Chem & Mat Sci, Key Lab Funct Organometall Mat Coll Hunan Prov, Hengyang 421008, Peoples R China.
通讯机构：
[Gong, Daoxin; Tang, Wenqing] H;Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Hunan, Peoples R China.;Hengyang Normal Univ, Coll Chem & Mat Sci, Key Lab Funct Met Organ Cpds Hunan Prov, Hengyang 421008, Peoples R China.;Hengyang Normal Univ, Coll Chem & Mat Sci, Key Lab Funct Organometall Mat Coll Hunan Prov, Hengyang 421008, Peoples R China.
关键词：
silicon-substituted carbonate hydroxyapatite;Zn2+;adsorption;removal efficiency
摘要：
A kind of low-cost silicon-substituted carbonate hydroxyapatite (Si-CHAP) powder was successfully fabricated by using eggshell powder, H3PO4, Ca(OH)2, Na2SiO3, and Na2CO3 under sonochemistry coprecipitation condition. Si-CHAP could serve as an ideal adsorbent to remove zinc ion (Zn2+) from aqueous solution. Under the optimized conditions, the removal efficiency of Zn2+ in solution by Si-CHAP could reach to 96.2%. The adsorption mechanism was investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques. Notably, the adsorption process followed the Langmuir isotherm and pseudo-second-order model, and the saturation adsorption capacities were calculated to be 102.0, 103.1, and 105.3mgg−1 at 293, 303, and 313K, respectively. Thermodynamic studies indicated that the adsorption of Zn2+ by Si-CHAP is endothermic. Mechanism studies revealed that the dominate mechanism was chemical adsorption. These results showed that Si-CHAP is an effective adsorbent for the removal of Zn2+ from aqueous solution, and thus providing a good method to treat Zn2+ in the waste water. © 2018 American Institute of Chemical Engineers Environ Prog, 37: 1901–1907, 2018. © 2018 American Institute of Chemical Engineers
语种：
英文
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Probing Calcium-Based Metal-Organic Frameworks via Natural Abundance 43Ca Solid-State NMR Spectroscopy
作者：
Chen, Shoushun;Lucier, Bryan E. G.;Chen, Mansheng;Terskikh, Victor V.;Huang, Yining*
期刊：
CHEMISTRY-A EUROPEAN JOURNAL ,2018年24(35):8732-8736 ISSN：0947-6539
通讯作者：
Huang, Yining
作者机构：
[Chen, Shoushun; Lucier, Bryan E. G.; Huang, Yining] Univ Western Ontario, Dept Chem, London, ON N6A 5B7, Canada.;[Chen, Mansheng] Hengyang Normal Univ, Key Lab Funct Organometall Mat, Coll Chem & Mat Sci, Hengyang 421008, Hunan, Peoples R China.;[Terskikh, Victor V.] Univ Ottawa, Dept Chem, Ottawa, ON K1N 6N5, Canada.
通讯机构：
[Huang, Yining] U;Univ Western Ontario, Dept Chem, London, ON N6A 5B7, Canada.
关键词：
calcium;density functional calculations;metal-organic frameworks;microporous materials;NMR spectroscopy
摘要：
Calcium-based metal-organic frameworks (MOFs) are of high importance due to their low cost and bio-compatible metal centers. Understanding the local environment of calcium in these materials is critical for unraveling the origins of specific MOF properties. 43Ca solid-state NMR spectroscopy is one of the very few techniques that can directly characterize calcium metal centers, however, the 43Ca nucleus is a very challenging target for solid-state NMR spectroscopy due to its extremely low natural abundance and resonant frequency. In this work, natural abundance 43Ca solid-state NMR spectroscopy, at a high magnetic field of 21.1 T, has been employed to characterize several calcium-based MOFs. We demonstrate that 43Ca NMR spectra and quantum chemical calculations can probe the local structure of calcium metal centers within MOFs, investigate the presence of guests, and monitor phase changes. © 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
语种：
英文
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Facile synthesis of Ag@Cu2 O heterogeneous nanocrystals decorated N-doped reduced graphene oxide with enhanced electrocatalytic activity for ultrasensitive detection of H2 O2
作者：
Li, Junhua;Jiang, Jianbo;Xu, Zhifeng;Liu, Mengqin;Tang, Siping;...
期刊：
Sensors and Actuators B-Chemical ,2018年260:529-540 ISSN：0925-4005
通讯作者：
Qian, Dong
作者机构：
[Tang, Siping; Liu, Mengqin; Xu, Zhifeng; Li, Junhua] Hengyang Normal Univ, Coll Chem & Mat Sci, Hengyang 421008, Peoples R China.;[Li, Junhua; Jiang, Jianbo; Qian, Dong] Cent S Univ, Coll Chem & Chem Engn, Changsha 410083, Hunan, Peoples R China.;[Li, Junhua] Hengyang Normal Univ, Key Lab Funct Met Organ Cpds Hunan Prov, Key Lab Funct Organometall Mat, Hengyang 421008, Peoples R China.;[Jiang, Jianbo] Jishou Univ, Coll Chem & Chem Engn, Jishou 416000, Peoples R China.;[Yang, Chunming] Hunan Normal Univ, Coll Chem & Chem Engn, Changsha 410081, Hunan, Peoples R China.
通讯机构：
[Qian, Dong] C;Cent S Univ, Coll Chem & Chem Engn, Changsha 410083, Hunan, Peoples R China.
关键词：
Hydrogen peroxide;Nonenzymatic sensor;Ultrasensitive detection;Ag@Cu2O nanocrystals;N-doped reduced graphene oxide
摘要：
A nanohybrid composed of Ag@Cu2O heterogeneous nanocrystals supported on N-doped reduced graphene oxide (Ag@Cu2O/N-RGO) has been synthesized by a simple wet-chemical method. The resultant composite consists of N-RGO sheets fully and homogeneously coated with a dense layer of Ag@Cu2O nanocrystals. Both Ag and N-RGO are in direct contact with Cu2O, and Ag nanoparticles with sizes of 2-5 nm are mainly deposited on the surface of Cu2O cubes (edge length of 500 nm). The electrochemical studies reveal that the ternary Ag@Cu2O/N-RGO composite exhibit significantly enhanced electrocatalytic activity for H2O2 sensing compared with either the single component (N-RGO) or two component systems (Cu2O/N-RGO and Ag/N-RGO), which is mainly due to the synergetic catalysis of the ternary system. The nonenzymatic sensor based on Ag@Cu2O/N-RGO composite shows overwhelmingly superior comprehensive performance for the H2O2 detection over the documented Ag-based sensors. More specifically, it displays a rapid response (10 s) to H2O2 over a wide linear range of 54-700 nM with a high sensitivity of 1298.3 mu A mM(-1) cm(-2) and a low detection limit of 10 nM. Moreover, the sensor also exhibits the preferable selectivity in the presence of biologically coactive compounds accompanied with long-term stability and good reproducibility. (C) 2018 Elsevier B.V. All rights reserved.
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英文
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