Poly[diaqua[μ4-4-(isonicotinamido)phthalato]nickel(II)] displaying an sra topology
作者：
Chen, Man-Sheng* ;Xu, Jin-Sheng;Deng, Yi-Fang;Zhang, Chun-Hua
期刊：
ACTA CRYSTALLOGRAPHICA SECTION C-STRUCTURAL CHEMISTRY ,2013年69(10):1124-1127 ISSN：2053-2296
通讯作者：
Chen, Man-Sheng
作者机构：
[Deng, Yi-Fang; Chen, Man-Sheng; Xu, Jin-Sheng; Zhang, Chun-Hua] Hengyang Normal Univ, Key Lab Funct Organometall Mat, Dept Chem & Mat Sci, Hengyang 421008, Hunan, Peoples R China.
通讯机构：
[Chen, Man-Sheng] H;Hengyang Normal Univ, Key Lab Funct Organometall Mat, Dept Chem & Mat Sci, Hengyang 421008, Hunan, Peoples R China.
关键词：
4-(isonicotinamido)phthalate ligand;coordination polymers;crystal structure;metal-organic frameworks;nickel complex;sra topology
摘要：
In the title compound, [Ni(C<inf>14</inf>H<inf>8</inf>N<inf>2</inf>O <inf>5</inf>)(H<inf>2</inf>O)<inf>2</inf>]<inf>n</inf>, the Ni<sup>II</sup> cation is six-coordinate with a slightly distorted octahedral coordination geometry and the 4-(isonicotinamido)phthalate ligand links the Ni<sup>II</sup> centres into a three-dimensional structure with sra topology. The structure is also stabilized by N - H&mellip;O hydrogen bonding between the uncoordinated amide groups of the ligand and extensive O - H&mellip;O hydrogen bonding between the two coordinated water molecules. The magnetic and thermal stability properties of the title compound are also discussed. ©2013 International Union of Crystallography.
语种：
英文
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(4,6-Dimethyl-2-sulfanylidenepyrimidin-1-ium) trichlorido(thiourea- κS)zinc(II)
作者：
Fu, Wei-Wei* ;Chen, Man-Sheng;Liu, Yang;Zhang, Fu-Xing
期刊：
ACTA CRYSTALLOGRAPHICA SECTION C-STRUCTURAL CHEMISTRY ,2013年69(4):384-387 ISSN：2053-2296
通讯作者：
Fu, Wei-Wei
作者机构：
[Fu, Wei-Wei; Zhang, Fu-Xing; Liu, Yang; Chen, Man-Sheng] Hengyang Normal Univ, Key Lab Funct Organometall Mat Gen Coll & Univ Hu, Dept Chem & Mat Sci, Hengyang 421008, Peoples R China.
通讯机构：
[Fu, Wei-Wei] H;Hengyang Normal Univ, Key Lab Funct Organometall Mat Gen Coll & Univ Hu, Dept Chem & Mat Sci, Hengyang 421008, Peoples R China.
摘要：
The title compound, (C<inf>6</inf>H<inf>9</inf>N<inf>2</inf>S)[ZnCl <inf>3</inf>{SC(NH<inf>2</inf>)<inf>2</inf>}], exists as a zincate where the zinc(II) centre is coordinated by three chloride ligands and a thiourea ligand to form the anion. The organic cation adopts the protonated 4,6-dimethyl-2- sulfanylidenepyrimidin-1-ium (L) form of 4,6-dimethylpyrimidine-2(1H)-thione. Two short N-H&mellip;Cl hydrogen bonds involving the pyrimidine H atoms and the [ZnCl<inf>3</inf>L]<sup>-</sup> anion form a crystallographically centrosymmetric dimeric unit consisting of two anions and two cations. The packing structure is completed by longer-range hydrogen bonds donated by the thiourea NH<inf>2</inf> groups to chloride ligand hydrogen-bond acceptors. ©2013 International Union of Crystallography.
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英文
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Green synthesis of silver nanoparticles-graphene oxide nanocomposite and its application in electrochemical sensing of tryptophan
作者：
Li, Junhua* ;Kuang, Daizhi;Feng, Yonglan;Zhang, Fuxing;Xu, Zhifeng;...
期刊：
Biosensors and Bioelectronics ,2013年42(1):198-206 ISSN：0956-5663
通讯作者：
Li, Junhua
作者机构：
[Liu, Mengqin; Xu, Zhifeng; Li, Junhua; Zhang, Fuxing; Feng, Yonglan; Kuang, Daizhi; Wang, Deping] Hengyang Normal Univ, Dept Chem & Mat Sci, Hengyang 421008, Hunan, Peoples R China.;[Liu, Mengqin; Xu, Zhifeng; Li, Junhua; Zhang, Fuxing; Feng, Yonglan; Kuang, Daizhi; Wang, Deping] Hengyang Normal Univ, Hunan Prov Coll, Key Lab Funct Organometall Mat, Hengyang 421008, Hunan, Peoples R China.;[Li, Junhua] Hengyang Normal Univ, Dept Chem & Mat Sci, 165 Huangbai Rd, Hengyang 421008, Hunan, Peoples R China.
通讯机构：
[Li, Junhua] H;Hengyang Normal Univ, Dept Chem & Mat Sci, 165 Huangbai Rd, Hengyang 421008, Hunan, Peoples R China.
关键词：
Electrochemical tryptophan detection;Graphene oxide;Silver nanoparticles;Tryptophan sensor
摘要：
A new kind of nanocomposite based on silver nanoparticles (AgNPs)/graphene oxide (GO) was conveniently achieved through a green and low-cost synthesis approach using glucose as a reducing and stabilizing agent, and the synthetic procedure can be easily used for the construction of a disposable electrochemical sensor on glassy carbon electrode (GCE). The nanocomposite was detailedly characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDX), Fourier transform infrared spectroscopy (FTIR) and electrochemical impedance spectroscopy (EIS). The experimental results demonstrated that the nanocomposite possessed the specific features of both silver nanoparticles and graphene, and the intrinsic high specific area and the fast electron transfer rate ascribed to the nanohybrid structure could improve its electrocatalytic performance greatly. Cyclic voltammetry (CV) and differential pulse voltammetry (DPV) were employed to evaluate the electrochemical properties of AgNPs/GO/GCE towards tryptophan, and the AgNPs/GO film exhibited a distinctly higher activity for the electro-oxidation of tryptophan than GO film with tenfold enhancement of peak current. The oxidation mechanism and the kinetic parameters were investigated, and analysis operation conditions were optimized. Under the selected experimental conditions, the oxidation peak currents were proportional to tryptophan concentrations over the range of 0.01. μM to 50.0. μM and 50.0. μM to 800.0. μM, respectively. The detection limit was 2.0. nM (S/. N=3). Moreover, the proposed method is free of interference from tyrosine and other coexisting species. The resulting sensor displays excellent repeatability and long-term stability; finally it was successfully applied to detect tryptophan in real samples with good recoveries, ranging from 99.0% to 103.0%. © 2012 Elsevier B.V.
语种：
英文
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A graphene oxide-based electrochemical sensor for sensitive determination of 4-nitrophenol
作者：
Li, Junhua* ;Kuang, Daizhi;Feng, Yonglan;Zhang, Fuxing;Xu, Zhifeng;...
期刊：
Journal of Hazardous Materials ,2012年201-202:250-259 ISSN：0304-3894
通讯作者：
Li, Junhua
作者机构：
[Liu, Mengqin; Xu, Zhifeng; Li, Junhua; Zhang, Fuxing; Feng, Yonglan; Kuang, Daizhi] Hengyang Normal Univ, Dept Chem & Mat Sci, Hengyang 421008, Hunan, Peoples R China.;[Liu, Mengqin; Xu, Zhifeng; Li, Junhua; Zhang, Fuxing; Feng, Yonglan; Kuang, Daizhi] Hengyang Normal Univ, Hunan Prov College, Key Lab Funct Organometall Mat, Hengyang 421008, Hunan, Peoples R China.
通讯机构：
[Li, Junhua] H;Hengyang Normal Univ, Dept Chem & Mat Sci, Hengyang 421008, Hunan, Peoples R China.
关键词：
4-Nitrophenol;Electrochemical sensor;Graphene oxide;Sensitive detection
摘要：
A graphene oxide (GO) film coated glassy carbon electrode (GCE) was fabricated for sensitive determination of 4-nitrophenol (4-NP). The GO-based sensor was characterized by scanning electron microscope, atomic force microscopy and electrochemical impedance spectroscopy. The electrochemical behaviors of 4-NP at the GO-film coated GCE were investigated in detail. In 0.1 M acetate buffer with a pH of 4.8, 4-NP yields a very sensitive and well-defined reduction peak at the GO-modified GCE. It is found that the GO film exhibits obvious electrocatalytic activity toward the reduction of 4-NP since it not only increases the reduction peak current but also lowers the reduction overpotential. Based on this, an electrochemical method was proposed for the direct determination of 4-NP. Various kinetic parameters such as transfer electron number, transfer proton number and standard heterogeneous rate constant were calculated, and various experimental parameters were also optimized. Under the optimal conditions, the reduction peak current varies linearly with the concentration of 4-NP ranging from 0.1 to 120 mu M, and the detection limit is 0.02 mu M at the signal noise ratio of 3. Moreover, the fabricated sensor presented high selectivity and long-term stability. This electrochemical sensor was further applied to determine 4-NP in real water samples, and it showed great promise for simple, sensitive, and quantitative detection of 4-NP. (C) 2011 Elsevier B.V. All rights reserved.
语种：
英文
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Poly[[(μ2 -4,4′-bipyridine)(μ3 -5-iso- nicotinamido-isophthalato)cobalt(II)] trihydrate]
作者：
Deng, Yi-Fang;Xu, Jin-Sheng;Chen, Man-Sheng* ;Zhang, Chun-Hua
期刊：
ACTA CRYSTALLOGRAPHICA SECTION C-STRUCTURAL CHEMISTRY ,2012年68(8):m219-m222 ISSN：2053-2296
通讯作者：
Chen, Man-Sheng
作者机构：
[Deng, Yi-Fang; Xu, Jin-Sheng; Chen, Man-Sheng; Zhang, Chun-Hua] Hengyang Normal Univ, Dept Chem & Mat Sci, Key Lab Funct Organometall Mat, Hengyang 421008, Hunan, Peoples R China.
通讯机构：
[Chen, Man-Sheng] H;Hengyang Normal Univ, Dept Chem & Mat Sci, Key Lab Funct Organometall Mat, Hengyang 421008, Hunan, Peoples R China.
摘要：
In the title compound, {[Co(C1<inf>4</inf>H<inf>8</inf>N<inf>2</inf>O <inf>5</inf>)(C<inf>10</inf>H<inf>8</inf>N<inf>2</inf>)]·3H <inf>2</inf>O}<inf>n</inf>, the Co<sup>II</sup> cation is five-coordinated with a slightly distorted trigonal-bipyramidal geometry, and the 5-isonicotinamido- isophthalate ligands link Co<sup>II</sup> atoms into a layered structure. These two-dimensional arrays are further pillared by rod-like 4,4′-bipyridine ligands to give a three-dimensional framework with pcu (primitive cubic) topology. The magnetic and adsorption properties of the title compound are also discussed. ©2012 International Union of Crystallography.
语种：
英文
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Molecularly imprinted polymer based on multiwalled carbon nanotubes for ribavirin recognition
作者：
Xu, Li* ;Xu, Zhi-feng
期刊：
Journal of Polymer Research ,2012年19(8):1-6 ISSN：1022-9760
通讯作者：
Xu, Li
作者机构：
[Xu, Li] S China Agr Univ, Coll Sci, Inst Biomat, Guangzhou 510642, Guangdong, Peoples R China.;[Xu, Zhi-feng] Hengyang Normal Univ, Dept Chem & Mat Sci, Hengyang 421008, Peoples R China.
通讯机构：
[Xu, Li] S;S China Agr Univ, Coll Sci, Inst Biomat, Guangzhou 510642, Guangdong, Peoples R China.
关键词：
Molecular imprinting technology;Multiwalled carbon nanotubes;Ribavirin;Molecule recognition
摘要：
Molecularly imprinted polymers on the surface of multiwalled carbon nanotubes (MWNTs) have been developed for selective recognition for Ribavirin. The composites (MWNTs/MIPs) were prepared by using Ribavirin as the template molecule, acrylamide (AAM) as the functional monomer, N, N- methylenebisacrylamide (NNMBA) as the cross-linker. MWNTs/MIPs obtained were characterized by fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and thermogravimetric analysis (TGA). The properties such as adsorption dynamics, special binding, and the selective recognition ability were evaluated. The adsorption equilibrium was arrived in about 4 h which indicated that the adsorption kinetic was comparatively fast. The results of binding and selectivity experiments showed that the MWNTs/MIPs could bind the template molecule selectively in aqueous media. ©Springer Science+Business Media B.V. 2012.
语种：
英文
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Synthesis, structure and properties of a two-dimensional iron(II) metal-organic framework
作者：
Chen, Mansheng* ;Zeng, Julan;Deng, Yifang;Zhang, Chunhua;Chen, Zhimin;...
期刊：
Transition Metal Chemistry ,2012年37(5):463-468 ISSN：0340-4285
通讯作者：
Chen, Mansheng
作者机构：
[Chen, Mansheng; Deng, Yifang; Chen, Zhimin; Kuang, Daizhi; Zhang, Chunhua] Hengyang Normal Univ, Dept Chem & Mat Sci, Key Lab Funct Organometall Mat, Hengyang 421008, Hunan, Peoples R China.;[Chen, Mansheng; Zeng, Julan] Changsha Univ Sci & Technol, Sch Chem & Biol Engn, Hunan Prov Key Lab Mat Protect Elect Power & Tran, Changsha 410004, Hunan, Peoples R China.
通讯机构：
[Chen, Mansheng] H;Hengyang Normal Univ, Dept Chem & Mat Sci, Key Lab Funct Organometall Mat, Hengyang 421008, Hunan, Peoples R China.
关键词：
Coordination Polymer;PXRD Pattern;Isophthalic Acid;Pyridyl Nitrogen;Pyridinedicarboxylate
摘要：
Reaction of FeSO<inf>4</inf>·7H<inf>2</inf>O with 5-(isonicotinamido) isophthalic acid (H<inf>2</inf>INAIP) in the presence of NaOH results in the formation of a two-dimensional network [Fe(INAIP)(H <inf>2</inf>O)]<inf>n</inf>·2nH<inf>2</inf>O. In the complex, each INAIP<sup>2</sup>- ligand links three Fe(II) atoms to give a doublechain structure using its two carboxylate groups in μ<inf>1</inf>- η<sup>1</sup>:η<sup>1</sup> and μ<inf>2</inf>-η<sup>1</sup>: η<sup>1</sup> coordination modes. The chains are interlinked to form a layer structure through Fe-N interactions, which it is extended to a three-dimensional supramolecular structure by H-bonding interactions. The thermal and magnetic properties of the complex were investigated, and antiferromagnetic interactions were observed. Moreover, the adsorption behavior shows that the title complex has obviously selective adsorption of CO <inf>2</inf> over N<inf>2</inf> after the removal of the solvent molecules within the pores. ©Springer Science+Business Media B.V. 2012.
语种：
英文
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Highly sensitive and simultaneous determination of ascorbic acid and rutin at an acetylene black paste electrode coated with cetyltrimethyl ammonium bromide film
作者：
Deng, Peihong* ;Xu, Zhifeng;Peng, Yonglan
期刊：
Journal of Electroanalytical Chemistry ,2012年683:47-54 ISSN：1572-6657
通讯作者：
Deng, Peihong
作者机构：
[Deng, Peihong; Xu, Zhifeng; Peng, Yonglan] Hengyang Normal Univ, Dept Chem & Mat Sci, Hengyang 421008, Hunan, Peoples R China.
通讯机构：
[Deng, Peihong] H;Hengyang Normal Univ, Dept Chem & Mat Sci, Hengyang 421008, Hunan, Peoples R China.
关键词：
Ascorbic acid;Rutin;Cetyltrimethyl ammonium bromide;Simultaneous detection;Voltammetry
摘要：
A simple and highly sensitive electrochemical method for the simultaneous and quantitative detection of ascorbic acid (AA) and rutin was developed, based on an acetylene black paste electrode coated with cetyltrimethyl ammonium bromide film (denoted as CTAB/ABPE). In 0.1 mol L<sup>-1</sup> HCl aqueous solution, the prepared modified electrode showed higher accumulation efficiency toward AA and rutin compared with bare ABPE, and significantly enhanced the peak currents of AA and rutin. The difference of the anodic peak potentials between AA and rutin was about 350 mV, which is large enough to determine AA and rutin individually and simultaneously. The electrochemical behaviors of AA and rutin were carefully investigated with the electrochemical parameters calculated. Under optimized conditions, the linear calibration ranges were 2.0 ×10<sup>-6</sup> M to 1.0 ×10<sup>-3</sup> M for AA and 6.0 ×10<sup>-9</sup> M to 1.0 ×10<sup>-5</sup> M for rutin, and the detection limits (S/N = 3) were 1.0 ×10<sup>-6</sup> M and 4.0 ×10 <sup>-9</sup> M, respectively. This modified electrode was applied to direct simultaneous determination of AA and rutin in the selected pharmaceutical samples without previous chemical or physical separations. Moreover, the CTAB/ABPE offers some advantages including low cost, facility of construction, good reproducibility and high stability. ©2012 Elsevier B.V. All rights reserved.
语种：
英文
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A novel electrochemical method for sensitive detection of melamine in infant formula and milk using ascorbic acid as recognition element
作者：
Li, Junhua* ;Kuang, Daizhi;Feng, Yonglan;Zhang, Fuzing;Xu, Zhifeng;...
期刊：
Bulletin of the Korean Chemical Society ,2012年33(8):2499-2507 ISSN：1229-5949
通讯作者：
Li, Junhua
作者机构：
[Liu, Mengqin; Zhang, Fuzing; Xu, Zhifeng; Li, Junhua; Feng, Yonglan; Kuang, Daizhi] Hengyang Normal Univ, Dept Chem & Mat Sci, Hengyang 421008, Hunan, Peoples R China.
通讯机构：
[Li, Junhua] H;Hengyang Normal Univ, Dept Chem & Mat Sci, Hengyang 421008, Hunan, Peoples R China.
关键词：
Electrochemical detection;Melamine;Ascorbic acid;Recognition element
摘要：
A novel and convenient electrochemical method has been developed for sensitive determination of melamine (MEL) using ascorbic acid (AA) as the recognition element. The working electrode employed in this method was modified with the nanocomposite of hydroxyapatite/carbon nanotubes to enhance the current signal of recognition element. The interaction between MEL and AA was investigated by fourier transform infrared spectroscopy and cyclic voltammetry, and the experimental results indicated that hydrogen bonding was formed between MEL and AA. Because of the existing hydrogen bonding and electrostatic interaction, the anodic peak current of AA was decreased obviously while the non-electroactive MEL added in. It illustrated that the MEL acted as an inhibitor to the oxidation of AA and the decreasing signals can be used to detect MEL. Under the optimal conditions, the decrease in anodic peak current of AA was proportional to the MEL concentrations ranging from 10 to 350 nM, with a detection limit of 1.5 nM. Finally this newly-proposed method was successfully employed to detect MEL in infant formula and milk, and good recovery was achieved.
语种：
英文
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Electrocatalytic reduction and determination of p-nitrophenol on acetylene black paste electrode coated with salicylaldehyde-modified chitosan
作者：
Deng, Peihong* ;Xu, Zhifeng;Feng, Yonglan;Li, Junhua
期刊：
Sensors and Actuators B-Chemical ,2012年168:381-389 ISSN：0925-4005
通讯作者：
Deng, Peihong
作者机构：
[Deng, Peihong; Xu, Zhifeng; Li, Junhua; Feng, Yonglan] Hengyang Normal Univ, Dept Chem & Mat Sci, Hengyang 421008, Peoples R China.
通讯机构：
[Deng, Peihong] H;Hengyang Normal Univ, Dept Chem & Mat Sci, Hengyang 421008, Peoples R China.
关键词：
p-Nitrophenol;Salicylaldehyde-modified chitosan;Acetylene black paste electrode;Voltammetric determination
摘要：
A novel method has been developed for the determination of p-nitrophenol (p-NP), which was based on the enhanced electrochemical response of p-NP at an acetylene black paste electrode coated with salicylaldehyde-modified chitosan (denoted as S-CHIT/ABPE). In 0.2 mol L−1 HCl solution, p-NP yielded a sensitive reduction peak at −0.348 V. Compared with the poor response at conventional carbon paste electrode, S-CHIT/ABPE remarkably increased the peak current of p-NP. All the experimental conditions, which influence the electrochemical response of p-NP, were studied and the optimum conditions were achieved. Finally, a sensitive and simple voltammetric method with a good linear relationship in the range of 8.0 × 10−8 mol L−1 to 2.0 × 10−6 mol L−1 was developed for the determination of p-NP. The detection limit (S/N = 3) was also examined and a low value of 3.0 × 10−8 mol L−1 for 120 s accumulation was obtained. The method has been successfully applied to the determination of p-NP in water samples with good recovery in the range of 96–104%.
语种：
英文
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Boronic Acid Terminated Thermo-Responsive and Fluorogenic Polymer: Controlling Polymer Architecture for Chemical Sensing and Affinity Separation
作者：
Xu, Zhifeng;Uddin, Khan Mohammad Ahsan;Ye, Lei*
期刊：
MACROMOLECULES ,2012年45(16):6464-6470 ISSN：0024-9297
通讯作者：
Ye, Lei
作者机构：
[Uddin, Khan Mohammad Ahsan; Xu, Zhifeng; Ye, Lei] Lund Univ, Div Pure & Appl Biochem, S-22100 Lund, Sweden.;[Xu, Zhifeng] Hengyang Normal Univ, Dept Chem & Mat Sci, Hengyang 421008, Hunan, Peoples R China.;[Xu, Zhifeng] Coll Hunan Prov, Key Lab Funct Organometall Mat, Hengyang 421008, Hunan, Peoples R China.;[Ye, Lei] Lund Univ, Div Pure & Appl Biochem, Box 124, S-22100 Lund, Sweden.
通讯机构：
[Ye, Lei] L;Lund Univ, Div Pure & Appl Biochem, Box 124, S-22100 Lund, Sweden.
摘要：
Thermo-responsive poly(N-isopropylacrylamide) (polyNIPAm) containing terminal boronic acid was synthesized using atom transfer radical polymerization (ATRP) in combination with Cu(I)-catalyzed alkyne-azide 1,3-dipolar cycloaddition (CuAAC) reaction. Alkyne-terminated polyNIPAm was first synthesized by ATRP using an alkyne-containing initiator. A fluorogenic boronic acid, 3-(2-azido-acetylamino)phenylboronic acid (APBA) was then linked to the polyNIPAm through CuAAC. The synthesized polymers were characterized by <sup>1</sup>H NMR, FT-IR, UV-vis, matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) mass spectrometry, and turbidity measurements. The intensity of fluorescence emission of the boronic acid-terminated polyNIPAm (BA-polyNIPAm) was found to increase when increasing amount of a cis-diol compound (i.e., fructose) was added. At physiological pH value, the BA-polyNIPAm effectively bound fructose and could be easily separated from aqueous solution by raising the temperature above its lower critical solution temperature (LCST). ©2012 American Chemical Society.
语种：
英文
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Removal of uranium(VI) from aqueous solution by dry chitosan powder
作者：
Yi, Zhengji* ;Li, Junhua
期刊：
Advanced Materials Research ,2012年366:434-437 ISSN：1022-6680
通讯作者：
Yi, Zhengji
作者机构：
[Li, Junhua; Yi, Zhengji] Hengyang Normal Univ, Key Lab Funct Organometall Mat, Coll Hunan Prov, Hengyang 421008, Hunan, Peoples R China.
通讯机构：
[Yi, Zhengji] H;Hengyang Normal Univ, Key Lab Funct Organometall Mat, Coll Hunan Prov, Hengyang 421008, Hunan, Peoples R China.
会议名称：
International Conference on Material Engineering, Architectural Engineering and Informatization (MEAEI 2011)
会议时间：
NOV 26-27, 2011
会议地点：
Wuhan, PEOPLES R CHINA
会议主办单位：
[Yi, Zhengji;Li, Junhua] Hengyang Normal Univ, Key Lab Funct Organometall Mat, Coll Hunan Prov, Hengyang 421008, Hunan, Peoples R China.
会议论文集名称：
Advanced Materials Research
关键词：
Adsorption;Chitosan Powder;PH;Temperature;Uranium
摘要：
This study investigated the likelihood of chitosan powder as a novel type of adsorbent, for U(VI) removal from wastewater. Batch experiments were performed to explore the effect of pH, sorption time, sorption temperature, chitosan dosage on U(VI) adsorption to chitosan powder. The results suggest that the accumulation process was highly pH dependent with pH changing from 2.0 to 7.0. An initial solution pH of 5.0 was most favorable for removal. Over the temperature range from 20°C to 70°C, 30°C was the optimum temperature for the U(VI) adsorption. The U(VI) uptake was rapid within 30 min and equilibrium was reached at 60 min. The U(VI) removal efficiency increased concomitantly with increasing chitosan dosage, while the adsorption capacity decreased. The chitosan had an observed U(VI) adsorption capacity of ca. 175 mg/g dry weight of chitosan. The present results implied that chitosan can be used as a sorbent for an effective removal of U(VI) from wastewater. ©(2012) Trans Tech Publications.
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英文
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A novel electrochemical sensor for isocarbophos based on a glassy carbon electrode modified with electropolymerized molecularly imprinted terpolymer
作者：
Yan, Xiaona;Deng, Jian* ;Xu, Jinsheng;Li, Hui;Wang, Lili;...
期刊：
Sensors and Actuators B-Chemical ,2012年171-172:1087-1094 ISSN：0925-4005
通讯作者：
Deng, Jian
作者机构：
[Wang, Lili; Yan, Xiaona; Xie, Jie; Chen, Dan; Li, Hui; Deng, Jian] Univ S China, Sch Chem & Chem Engn, Hengyang 421001, Hunan, Peoples R China.;[Xu, Jinsheng] Hengyang Normal Univ, Dept Chem & Mat Sci, Hengyang 421008, Hunan, Peoples R China.
通讯机构：
[Deng, Jian] U;Univ S China, Sch Chem & Chem Engn, Hengyang 421001, Hunan, Peoples R China.
关键词：
Gallic acid;Isocarbophos;Molecularly imprinted polymer;m-Aminobenzoic acid;o-Phenylenediamine
摘要：
In this paper, a novel electrochemical sensor with sensitive and selective binding sites for isocarbophos (ICP) detection is reported, which is based on a glassy carbon electrode (GCE) modified with molecularly imprinted terpolymer of poly(o-phenylenediamine-co-gallic acid-co-m-aminobenzoic acid) (p(PD-GA-ABA)) templated with ICP. The surface feature of the p(PD-GA-ABA) modified GCE (MIP/GCE) was characterized by cyclic voltammetry (CV), differential pulse voltammetry (DPV) and electrochemical impedance spectroscopy (EIS). Several important parameters controlling the performance of the MIP/GCE were investigated and optimized. Under optimal conditions, the changes in DPV peak currents of the redox probe, hexacyanoferrate, were linear to ICP concentrations in the range from 7.50 ×10<sup>-8</sup> to 5.00 ×10<sup>-5</sup> M and 5.00 ×10<sup>-5</sup> to 1.00 ×10<sup>-4</sup> M, with the detection limit of 2.01 ×10<sup>-8</sup> M (S/N = 3). The method was applied successfully to determine ICP in cabbage and cowpea samples with satisfactory precision (2.30-5.28% of RSD) and acceptable recoveries (95.5-110.0%), demonstrating a promising feature for applying the MIP sensor to the measurement of ICP in real samples. ©2012 Elsevier B.V. All rights reserved.
语种：
英文
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Electrochemical DNA sensor based on methylene blue functionalized polythiophene as a hybridization indicator
作者：
Liu, Mengqin* ;Luo, Chunhua;Peng, Hui
期刊：
Talanta ,2012年88:216-221 ISSN：0039-9140
通讯作者：
Liu, Mengqin
作者机构：
[Liu, Mengqin] Hengyang Normal Univ, Dept Chem & Mat Sci, Hengyang 421008, Hunan, Peoples R China.;[Luo, Chunhua; Peng, Hui] E China Normal Univ, Minist Educ, Key Lab Polarized Mat & Devices, Shanghai 200241, Peoples R China.
通讯机构：
[Liu, Mengqin] H;Hengyang Normal Univ, Dept Chem & Mat Sci, Hengyang 421008, Hunan, Peoples R China.
关键词：
Electrochemical DNA sensor;Polythiophene;Methylene blue;Hybridization
摘要：
A polythiophene functionalized with methylene blue (PMT-MB) was synthesized and used as an indicator for electrochemical oligonucleotides (ODNs) hybridization detection. After hybridization with complementary ODNs, the current signal of PMT-MB increased, which illustrated that PMT-MB can effectively recognize complementary ODN targets as an indicator. Compared to MB, PMT-MB showed much better resistance to the concentration change of buffer solution. In all buffer solutions tested, the hybridization always resulted in the increased current signal of PMT-MB due to the electrostatic interaction. While, when MB was used as an indicator, the inconsistent current response was obtained after the hybridization. When high concentration of buffer solution was used for accumulation, the hybridization resulted in the decreased current signal, while at the low concentrations, the current signal increased. The interaction between PMT-MB and dsODNs was also studied by UV-vis spectroscopy. ©2011 Elsevier B.V. All rights reserved.
语种：
英文
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Carboxy and diphosphate ester hydrolysis promoted by di- or tri-nuclear zinc(II) complexes based on β-cyclodextrin
作者：
Tang, Si-Ping;Hu, Ping;Chen, Huo-Yan;Chen, Sha;Mao, Zong-Wan* ;...
期刊：
Journal of Molecular Catalysis A: Chemical ,2011年335(1-2):222-227 ISSN：1381-1169
通讯作者：
Mao, Zong-Wan
作者机构：
[Ji, Liang-Nian; Chen, Sha; Tang, Si-Ping; Mao, Zong-Wan; Hu, Ping; Chen, Huo-Yan] Sun Yat Sen Univ, Sch Chem & Chem Engn, MOE Key Lab Bioinorgan & Synthet Chem, Guangzhou 510275, Guangdong, Peoples R China.;[Tang, Si-Ping] Hengyang Normal Univ, Dept Chem & Mat Sci, Key Lab Funct Organometall Mat, Hengyang 421008, Peoples R China.;[Mao, Zong-Wan] S China Agr Univ, Coll Sci, Dept Appl Chem, Guangzhou 510642, Guangdong, Peoples R China.
通讯机构：
[Mao, Zong-Wan] S;Sun Yat Sen Univ, Sch Chem & Chem Engn, MOE Key Lab Bioinorgan & Synthet Chem, Guangzhou 510275, Guangdong, Peoples R China.
关键词：
Bis-cyclodextrins;Ester hydrolysis;Kinetics;Trinuclear zinc complex
摘要：
A new ligand (L), 6-mono-(2-(2-hydroxy-3-(hydroxymethyl)-5-methyl benzylamino)-ethylamino)-β-cyclodextrin, based on β-cyclodextrin derivatives with dinucleating units was synthesized and used to prepare a trimetallic bis-ligands zinc complex (Zn3(L2−)2). The esterase activity of the complex was investigated by the hydrolysis of two carboxylic acid esters, bis(4-nitrophenyl)carbonate (BNPC) and 4-nitrophenyl acetate (NA), and a DNA model bis(4-nitrophenyl)phosphate (BNPP) as a phosphate ester. The catalytic rate for BNPC was very high, which was found to be a 5.63 × 103-fold rate enhancement over uncatalyzed hydrolysis and 1.62 × 102-fold rate enhancement over uncatalyzed hydrolysis for NA hydrolysis at pH = 7.0. For the catalytic hydrolysis of BNPP, the initial first-order rate constant of 0.1 mM catalyst was 5.85 × 10−8 s−1 at pH = 8.50 and 35 °C, which is a 731-fold acceleration over uncatalyzed hydrolysis. The second rate constant (kBNPP) was found to be 1.22 × 10−3 M−1 s−1 at pH = 10.0. According to the potentiometric titration study, the zinc complex exists in a dinuclear single ligand coordinated mode and a trinuclear bis-ligands system at pH ≥ 7.0. The ester hydrolysis activity was attributed to the cooperative interaction of the two metal centers and the hydrophobic cavity of β-cyclodextrin with substrates.Graphical abstractA new ligand (L) with dinucleating units based on β-cyclodextrin was synthesized. Its trimetallic bis-cyclodextrins zinc complex (Zn3(L2−)2) was demonstrated as a potent catalyst for ester hydrolysis.View high quality image (115K)Research highlights▶ Trinuclear zinc complex based β-cyclodextrins catalyzed ester hydrolysis. The complex displayed good hydrolytic activities for monoester and diesters. The cooperation of metal centers and β-cyclodextrin was important for ester cleavage.
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Determination of molybdenum by adsorptive anodic stripping voltammetry of molybdenum–alizarin violet complex at an acetylene black paste electrode
作者：
Deng, Peihong* ;Fei, Junjie;Zhang, Jun;Feng, Yonglan
期刊：
Food Chemistry ,2011年124(3):1231-1237 ISSN：0308-8146
通讯作者：
Deng, Peihong
作者机构：
[Deng, Peihong; Feng, Yonglan; Zhang, Jun] Hengyang Normal Univ, Dept Chem & Mat Sci, Coll Hunan Prov, Key Lab Funct Organometall Mat, Hengyang 421008, Peoples R China.;[Fei, Junjie] Xiangtan Univ, Coll Chem, Minist Educ, Key Lab Environm Friendly Chem & Applicat, Xiangtan 411105, Peoples R China.
通讯机构：
[Deng, Peihong] H;Hengyang Normal Univ, Dept Chem & Mat Sci, Coll Hunan Prov, Key Lab Funct Organometall Mat, Hengyang 421008, Peoples R China.
关键词：
Acetylene black paste electrode;Adsorptive anodic stripping voltammetry;Alizarin violet;Molybdenum determination
摘要：
A reliable and sensitive procedure for the determination of trace levels of molybdenum by adsorptive anodic stripping voltammetry is proposed. The method is based on adsorptive accumulation of the molybdenum (Mo)-alizarin violet (AV) complex onto an acetylene black paste electrode (ABPE), followed by oxidation of the adsorbed species by voltammetric scan using a second-order derivative modulation. For voltammetric determination of molybdenum, the parameters influencing the peak current have been optimized. Under the selected conditions, the electrode demonstrated linear response over a wide range of Mo(VI) concentration (6.0×10-9-1.0×10-5mol/L), the detection limit was 2.0×10-9mol/L (S/N=3) for 120s accumulation. The effects of potential interfering ions were studied, and it was found that the proposed procedure was free from most interferences. The method has been applied to the determination of molybdenum in plant foodstuffs, and satisfied results were obtained. © 2010 Elsevier Ltd.
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Fluorimetric method to determine trace anionic surfactants using a novel triazene reagent
作者：
Feng, Yong-lan* ;Tang, Wen-qing;Zeng, Rong-ying
期刊：
Advanced Materials Research ,2011年233-235:1370-1374 ISSN：1022-6680
通讯作者：
Feng, Yong-lan
作者机构：
[Zeng, Rong-ying; Feng, Yong-lan; Tang, Wen-qing] Hengyang Normal Univ, Dept Chem & Mat Sci, Hengyang 421008, Peoples R China.
通讯机构：
[Feng, Yong-lan] H;Hengyang Normal Univ, Dept Chem & Mat Sci, Hengyang 421008, Peoples R China.
会议名称：
International Conference on Chemical Engineering and Advanced Materials
会议时间：
MAY 28-30, 2011
会议地点：
Changsha, PEOPLES R CHINA
会议主办单位：
[Feng, Yong-lan;Tang, Wen-qing;Zeng, Rong-ying] Hengyang Normal Univ, Dept Chem & Mat Sci, Hengyang 421008, Peoples R China.
会议论文集名称：
Advanced Materials Research
关键词：
1-(5-naphthol-7-sulfonic acid)-3-(4-pheny-lazophenyl)- triazene;Anionic surfactants;Fluorescence quenching
摘要：
Although widely applied in many industries, anionic surfactants (AS) have been shown to contaminate the natural environment. Therefore, the detection of trace amounts of AS in environmental samples is of great interest. Here, we report a novel fluorescence quenching method for the determination of trace AS, specifically, sodium dodecyl sulfate (SDS), using 1-(5-naphthol-7-sulfonic acid) -3-(4-pheny-lazophenyl)-triazene (NASAPAPT). Under optimum conditions, the degree of fluorescence quenching is linearly proportional to the concentration of SDS from 2.08×10-8 to 8.67×10-7mol L-1 with a detection limit of 8.35×10-9mol L-1. The proposed method exhibits high sensitivity and selectivity, yet it avoids the use of toxic organic solvents and tedious solvent extraction procedures. It has been applied to the determination of trace SDS in both natural water and industrial samples with recoveries between 99.04 and 103.58%. Results indicated that the hydrogen bonds formed between NASAPAPT and SDS played an important role in the detection process and that the π→π* transition was crucial for fluorescence of the NASAPAPT complex.
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英文
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Porous zinc(II) frameworks with 5-(isonicotinamido)isophthalate: Syntheses, structures and properties
作者：
Chen, Man-Sheng;Chen, Min;Okamura, Taka-aki;Sun, Wei-Yin* ;Ueyama, Norikazu
期刊：
Microporous and Mesoporous Materials ,2011年139(1-3):25-30 ISSN：1387-1811
通讯作者：
Sun, Wei-Yin
作者机构：
[Sun, Wei-Yin; Chen, Min; Chen, Man-Sheng] Nanjing Univ, Inst Coordinat Chem, State Key Lab Coordinat Chem, Sch Chem & Chem Engn,Nanjing Natl Lab Microstruct, Nanjing 210093, Peoples R China.;[Chen, Man-Sheng] Hengyang Normal Univ, Dept Chem & Mat Sci, Hengyang 421008, Peoples R China.;[Ueyama, Norikazu; Okamura, Taka-aki] Osaka Univ, Dept Macromol Sci, Grad Sch Sci, Osaka 5600043, Japan.
通讯机构：
[Sun, Wei-Yin] N;Nanjing Univ, Inst Coordinat Chem, State Key Lab Coordinat Chem, Sch Chem & Chem Engn,Nanjing Natl Lab Microstruct, Nanjing 210093, Peoples R China.
关键词：
Coordination polymer;Zinc(II) complex;Crystal structure;Sorption property
摘要：
Two new three-dimensional (3D) coordination polymers [Zn(INAIP)] ·2DMF (1) and [Zn(INAIP)]·9H<inf>2</inf>O (2) have been synthesized by reactions of Zn(NO<inf>3</inf>)<inf>2</inf>·6H <inf>2</inf>O with 5-(isonicotinamido)isophthalic acid (H<inf>2</inf>INAIP) in N,N-dimethylformamide (DMF) and N,N-diethylformamide (DEF), respectively. The change of solvent leads to the formation of neutral frameworks with different structure, topology as well as different pore size and shape. The X-ray crystallographic structural analysis revealed that complex 1 is an unusual 3D architecture with (3, 6)-connected rutile (rtl) topology containing two-dimensional (2D) (4, 4) networks, while the 3D framework in 2 has (3, 6)-connected (4<sup>2</sup>·6)<inf>2</inf>(4<sup>4</sup>·6 <sup>2</sup>·8<sup>6</sup>·10<sup>3</sup>) topology with 2D kagome´layers. In addition, the stabilities, luminescence and adsorption properties of the complexes were investigated. ©2010 Elsevier Inc. All rights reserved.
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英文
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A new electrochemical method for the determination of trace molybdenum(VI) using carbon paste electrode modified with sodium dodecyl sulfate
作者：
Deng, Pei-hong* ;Feng, Yong-lan;Fei, Jun-jie
期刊：
Journal of Electroanalytical Chemistry ,2011年661(2):367-373 ISSN：1572-6657
通讯作者：
Deng, Pei-hong
作者机构：
[Feng, Yong-lan; Deng, Pei-hong] Hengyang Normal Univ, Dept Chem & Mat Sci, Hengyang 421008, Hunan, Peoples R China.;[Fei, Jun-jie] Xiangtan Univ, Coll Chem, Xiangtan 411105, Hunan, Peoples R China.
通讯机构：
[Deng, Pei-hong] H;Hengyang Normal Univ, Dept Chem & Mat Sci, Hengyang 421008, Hunan, Peoples R China.
关键词：
Molybdenum;Morin;Sodium dodecyl sulfate;Carbon paste electrodes;Adsorptive anodic stripping voltammetry
摘要：
A sensitive procedure was developed for the determination of trace molybdenum(VI) by adsorptive anodic stripping voltammetry based on the oxidation of molybdenum(VI)-2′,3,4′,5,7-pentahydroxyflavone (morin) complex at a sodium dodecyl sulfate modified carbon paste electrode (denoted as SDS/CPE). Compared with the poor response at a conventional paste electrode, the electrooxidation of molybdenum(VI)-morin complex at the SDS/CPE was greatly improved, as confirmed from the significant enhancement of peak current and the negative shift of peak potentials. The optimum conditions for the analysis of molybdenum(VI) include 0.1 M sulfuric acid, 3.0 ×10<sup>-5</sup> M or 3.0 ×10<sup>-6</sup> M morin, an accumulation potential of -0.1 V (versus SCE), an accumulation period of 60 s or 120 s and a scan rate of 0.1 V s <sup>-1</sup>. Under the selected conditions, the linearity between peak currents and concentrations of molybdenum(VI) existed for a wide range of 8.0 ×10<sup>-10</sup>-6.0 ×10<sup>-8</sup> M (c<inf>morin</inf> = 3 ×10<sup>-6</sup> M) for 120 s accumulation and 6.0 ×10 <sup>-8</sup>-6.0 ×10<sup>-6</sup> M (c<inf>morin</inf> = 3 ×10<sup>-5</sup> M) for 60 s accumulation, a low detection limit (three times signal to noise) of 4.0 ×10<sup>-10</sup> M was obtained after a 120 s preconcentration. The proposed method was successfully applied to the determination of molybdenum(VI) in real samples with enhanced selectivity. ©2011 Elsevier B.V. All rights reserved.
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Trace determination of molybdenum by anodic adsorptive stripping voltammetry using a multi-walled carbon nanotubes modified carbon paste electrode
作者：
Deng, Pei-Hong* ;Fei, Jun-Jie;Feng, Yong-Lan
期刊：
Sensors and Actuators B-Chemical ,2010年148(1):214-220 ISSN：0925-4005
通讯作者：
Deng, Pei-Hong
作者机构：
[Feng, Yong-Lan; Deng, Pei-Hong] Hengyang Normal Univ, Dept Chem & Mat Sci, Coll Hunan Prov, Key Lab Funct Organometall Mat, Hengyang 421008, Peoples R China.;[Fei, Jun-Jie] Xiangtan Univ, Coll Chem, Minist Educ, Key Lab Environmentally Friendly Chem & Applicat, Xiangtan 411105, Peoples R China.
通讯机构：
[Deng, Pei-Hong] H;Hengyang Normal Univ, Dept Chem & Mat Sci, Coll Hunan Prov, Key Lab Funct Organometall Mat, Hengyang 421008, Peoples R China.
关键词：
Alizarin violet;Anodic adsorptive stripping voltammetry;Modified electrode;Molybdenum;Multi-walled carbon nanotubes
摘要：
A method for the voltammetric determination of trace molybdenum using a multi-walled carbon nanotubes modified carbon paste electrode (MWCNT/CPE) was described. The new procedure is based on the adsorptive accumulation of the Mo(VI)–alizarin violet (AV) complex onto the surface of the modified electrode, followed by the electrochemical oxidation of adsorbed species. The modified electrode showed high electrocatalytic activity toward the oxidation of the free ligand and the complex and the peak current was enhanced significantly. The optimal experimental conditions include the use of 0.12 mol L−1 potassium biphthalate (KHP) buffer (pH 3.6), 4.0 × 10−6 mol L−1 AV (cMo(VI) ≤ 1.0 × 10−7 mol L−1)/4.0 × 10−5 mol L−1AV (cMo(VI) > 1.0 × 10−7 mol L−1), an accumulation potential of −0.30 V (versus SCE), an accumulation time of 120 s, a scan rate of 100 mV s−1 and a second-order derivative linear scan mode. The oxidation peak for the complex appears at 0.59 V. The peak current increases linearly with Mo(VI) concentration in the range of 4.0 × 10−10 mol L−1 to 1.0 × 10−7 mol L−1 and 2.0 × 10−7 mol L−1 to 8.0 × 10−6 mol L−1 and the detection limit (S/N = 3) is 1.0 × 10−10 mol L−1 (accumulation time 120 s). The proposed method was applied to the determination of Mo(VI) in natural water samples with satisfactory results.
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英文
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