期刊：
Journal of Future Foods,2025年5(2):162-171 ISSN：2772-5669
通讯作者：
Peihong Deng<&wdkj&>Quanguo He
作者机构：
[Peihong Deng; Hui Sun; Junhua Li] Key Laboratory of Organometallic New Materials, Key Laboratory of Functional Metal-Organic Compounds of Hunan Province, Department of Chemistry and Material Science, Hengyang Normal University, Hengyang 421008, China;[Chuanqin Zhou; Aiting Chen; Yanping Wei; Nana Tang; Shuting Shi; Jinsong Zuo; Quanguo He] College of Life Science and Chemistry, Hunan University of Technology, Zhuzhou 412007, China
通讯机构：
[Peihong Deng] K;[Quanguo He] C;College of Life Science and Chemistry, Hunan University of Technology, Zhuzhou 412007, China<&wdkj&>Key Laboratory of Organometallic New Materials, Key Laboratory of Functional Metal-Organic Compounds of Hunan Province, Department of Chemistry and Material Science, Hengyang Normal University, Hengyang 421008, China
摘要：
In this work, a fascinating nanocomposite based on manganese-cobalt sulfide (MnS/Co3S4) wrapped by electrochemically reduced graphene oxide (ERGO) has been successfully synthesized on the surface of a glassy carbon electrode (GCE) by a facile hydrothermal assisted electrochemical reduction method. The modified electrode was fully characterized by scanning electron microscopy, cyclic voltammetry and electrochemical impedance spectroscopy. The morphological results illustrate that MnS/Co3S4 are embedded in the ERGO layers, resulting in a rough surface and three-dimensional (3D) microstructure. The as-synthesized MnS/Co3S4-ERGO/GCE displays distinctly enhanced electrocatalytic activity for vanillin oxidation in comparison with that of the ERGO/GCE and MnS/Co3S4/GCE. Therefore, the MnS/Co3S4-ERGO/GCE can be used as an effective electrochemical sensing platform for the sensitive determination of vanillin, and the fabricated sensor displays a wide linear range of 0.02−1.00 μmol/L and 1.0−40.0 μmol/L, low detection limit of 4.0 nmol/L and satisfactory recoveries between 98.0% and 102.8%.
摘要：
Metal single-atom catalysts offer the dual advantages of high electrochemical activity and near 100 % metal atom utilization, leading to their potential use in low-cost electrochemical sensor development. Herein, a novel electrocatalyst comprising atomically-dispersed Mn on B,N co-doped bamboo-derived carbon (MnSAs-BN-BC) was synthesized via a facile pyrolysis procedure. A high dispersion of Mn single atoms in MnSAs-BN-BC was confirmed by aberration-corrected transmission electron microscopy and elemental mapping. The Mn loading in the MnSAs-BN-BC determined by inductively coupled plasma mass spectrometry was 255 mg kg-1. MnSAs-BNBC displayed outstanding electrocatalytic performance for levodopa (LD) oxidation, allowing a robust electrochemical sensing platform for LD detection to be established. The MnSAs-BN-BC/GCE sensing platform offered a wide LD detection range (concentrations from 2 to 683 mu M) and a very low limit of detection (LOD) of 0.45 mu M, outperforming almost all electrochemical sensors reported to date for LD sensing. The MnSAs-BN-BC/GCE platform also featured outstanding repeatability, reproducibility, selectivity, and stability. The as-developed sensing platform was successfully applied to LD quantification in commercial tablets with satisfactory recoveries (85.2-102.4 %), with the analytical precision of method validated against a traditional UV-vis spectrophotometry method. Density functional theory (DFT) calculations showed that Mn single atom sites lowered the reaction energy barrier for LD oxidation, with the favorable d-band center position of Mn single atom sites in MnSAs-BN-BC contributing to the enhanced LD sensing performance. This work encourages the use of singleatom metal catalysts in design of high-performance electrochemical sensors for the rapid detection of LD.
关键词：
Adsorption and photocatalysis;Double-ligand Zr-based MOF;Inverted modulator strategy;Tetracycline
摘要：
Developing visible-light response photocatalysts with high activity and adsorption alongside sustainability is vitally important to environmental restoration. Here, we fabricated a novel metal organic framework (MOF) with cost-effective double-ligands (fumaric acid and 2-aminoterephthalic acid as ligand precursors, denoted as MA-MOF) via a facile solvothermal method. Specifically, crystalline [Zr(6)O(4)(OH)(4)(fumarate)(6)] (MOF-801) can be only formed with monocarboxylic acids as modulators. Therefore, in the construction of crystalline double-ligand MA-MOF, the absence of monocarboxylic acid modulators successfully prevents the formation of crystalline MOF-801. Instead, the crystalline double-ligand MA-MOF is formed. Properties of MA-MOFs including the surface area, porosity, charge transfer resistance, and energy level position can be adjusted via altering the ratio of ligands. The optimal sample, MA-MOF2 (prepared with a molar ratio of fumaric acid and 2-aminoterephthalic acid being 2:1), shows a total 94.6% removal of tetracycline via adsorption and photodegradation, far exceeding the corresponding single-ligand counterparts. This work proposes an innovative inverted modulator strategy for constructing double-ligand MOFs.
期刊：
Chemical Engineering Science,2023年280:119026 ISSN：0009-2509
通讯作者：
Yang, CM;Liu, Jinlong;Qian, D
作者机构：
[Ren, Jun; Yang, Chunming; Liang, Yun; Wang, Qing; Xiang, Qian] Hunan Normal Univ, Natl & Local Joint Engn Lab New Petro Chem Mat & F, Changsha 410081, Peoples R China.;[Ren, Jun; Yang, Chunming; Liang, Yun; Wang, Qing; Xiang, Qian] Hunan Normal Univ, Coll Chem & Chem Engn, Key Lab Chem Biol & Tradit Chinese Med Res, Minist Educ China, Changsha 410081, Peoples R China.;[Liu, Jinlong; Ren, Jun; Qian, Dong; Liu, JL] Cent South Univ, Coll Chem & Chem Engn, Changsha 410083, 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, D ; Liu, JL] C;[Yang, CM ] H;Hunan Normal Univ, Natl & Local Joint Engn Lab New Petro Chem Mat & F, Changsha 410081, Peoples R China.;Hunan Normal Univ, Coll Chem & Chem Engn, Key Lab Chem Biol & Tradit Chinese Med Res, Minist Educ China, Changsha 410081, Peoples R China.;Cent South Univ, Coll Chem & Chem Engn, Changsha 410083, Peoples R China.
关键词：
Cu;Cu 2 O;NiO@NiCu foam;O-vacancy;Heterostructure;Electrocatalyst;Hydrogen evolution;Density functional theory calculations
摘要：
Defect-engineering and heterojunction-creating on a catalyst have been endorsed as effective approaches to enhance the hydrogen evolution reaction (HER) behavior. By skillfully employing the transformation of Cu2S/ Ni3S2 to NiO/Cu2O and the electroreduction of partial Cu2O to Cu/Cu2O for the O-vacancy (Ov) production and in-situ reactions for the heterostructure construction, we fabricated a self-supported heterostructured hybrid with Ov-rich Cu/Cu2O coupled with few NiO grown in-situ on the NiCu bimetallic foam (named as Cu/NiO/ Cu2O@NCF). Cu/NiO/Cu2O@NCF records a low overpotential of 79 mV at 10 mA cm-2 with a small Tafel slope of 60 mV dec � 1 and sustained the activity without distinct decay for 100 h towards catalyzing HER in 1.0 M KOH. More profoundly, density functional theory computations reveal that Ov-Cu2O holds a much lower energy barrier for the rate-determining step of the H2O dissociation and a more electron density with respect to Ov-NiO, thereby accelerating the alkaline HER kinetics.
摘要：
A new method for the synthesis of 3-ethynyl-1-methylene-1,2-dihydronaphthalenes via copper-promoted palladium-catalyzed intermolecular alkynylative [5 + 1] carboannulation of 1-arylphenyl-prop-2-yn-1-yl acetates involving C–H functionalization is described. Two terminal alkyne molecules serve as an alkynylation reagent and a one-carbon unit to enable alkynylative [5 + 1] carboannulation with excellent selectivity control, broad substrate scope and good tolerance of functional groups.
摘要：
Here we report a facile and cost-effective preparation of nickel nanoparticle S/Nitrogen-carbon nanohybrid (Ni NPS/N-C) based on formamide condensation and carbonization, used for highly sensitive and selective electrochemical determination of tryptophan (Trp) in practical samples. The crystallographic phase, surface morphology, elemental distribution, and chemical state of the Ni NPS/N-C nanohybrid were analyzed by XRD, SEM, TEM, EDS, XPS, FTIR, TGA and Raman spectra. The results show that high content of Ni NPs (6.62 wt%) were distributed in the nanohybrid, and a large number of bamboo-like nanotubes were formed during pyrolysis, which dramatically increases the specific surface area, and remarkably promotes the electrical conductivity as well as the catalytic activity of the nanohybrid. The electrochemical behavior of Trp was investigated on the nanohybrid modified carbon paste electrode (Ni NPS/N-C/CPE) and the measurement parameters were optimized. As expected, the modified electrode can remarkably enhance the electrochemical oxidation signal of Trp. Under the optimal experimental conditions, a linear relationship in the range of 0.01-20 mu M and 20-80 mu M for Trp was established with detection limit of 5.7 nM (S/N = 3). Finally, the proposed sensor was practically applied by evaluation and determination of Trp from various sourcing samples including human serum and pharmaceutical samples.
作者机构：
[Deng, Peihong; Li, Junhua] Hengyang Normal Univ, Dept Chem & Mat Sci, Key Lab Funct Met Organ Cpds Hunan Prov, Key Lab Funct Organomet Mat Hunan Prov Univ, Hengyang 421008, Peoples R China.;[He, Quanguo; Tian, Yaling; Wu, Yiyong; Xiao, Jingyun; Feng, Jinxia] Hunan Univ Technol, Sch Life Sci & Chem, Zhuzhou 412007, Peoples R China.
通讯机构：
[Peihong Deng] D;[Quanguo He] S;School of Life Science and Chemistry, Hunan University of Technology, Zhuzhou 412007, China<&wdkj&>Department of Chemistry and Material Science, Hengyang Normal University, Key Laboratory of Functional Metal-Organic Compounds of Hunan Province, Key Laboratory of Functional Organometallic Materials of Hunan Provincial Universities, Hengyang 421008, China
摘要：
A new electrochemical sensor for the quick determination of both paracetamol (ACOP) and ascorbic acid (AA) was prepared using an acetylene black paste electrode modified with polyvinylpyrrolidone and graphene composite (PVP-GR/ABPE). Second derivative linear sweep voltammetry (SDLSV) and cyclic voltammetry (CV) were then used to investigate the electrochemical behavior of both ACOP and AA on this PVP-GR/ABPE. The results demonstrate that the two analytes have good resolution and strong electrochemical signal responses. Due to the interconnected effects of PVP, GR, and AB ternary composite, the designed electrode has several beneficial characteristicsincluding good adsorption ability, significant specific surface area, and good conductivity. The voltammetric responses of ACOP and AA on the PVP-GR/ABPE show that the modified electrode displayed good electrocatalytic properties for the chemical reactions of both ACOP and AA, with the linear range of 0.01-100 mu M for ACOP and the linear range of 6-1000 mu M for AA. The detection limits of 6.0 nM (ACOP) and 1.0 mu M (AA) were obtained, respectively. The sensor has successfully been used in the measurement of ACOP and AA in real samples, indicating that this method is potentially applicable for routine biomedical and chemical sensing in vitro diagnostically. (c) 2021 The Electrochemical Society ("ECS"). Published on behalf of ECS by IOP Publishing Limited.
作者机构：
[Deng, Peihong; Li, Junhua] 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.;[He, Quanguo; Tian, Yaling; Wu, Yiyong; Xiao, Jingyun; Feng, Jinxia] Hunan Univ Technol, Sch Life Sci & Chem, Zhuzhou 412007, Peoples R China.
通讯机构：
[Peihong Deng] D;[Quanguo He] S;School of Life Science and Chemistry, Hunan University of Technology, Zhuzhou 412007, China<&wdkj&>Department of Chemistry and Material Science, Hengyang Normal University, Key Laboratory of Functional Metal-Organic Compounds of Hunan Province, Key Laboratory of Functional Organometallic Materials of Hunan Provincial Universities, Hengyang 421008, China
摘要：
In recent years, small-sized electrodes have drawn widespread attraction in electroanalysis due to high sensitivity, rapid response and low cost. Hereby, a sub-millimeter paste electrode with inner diameter of 0.8 mm was prepared by combining the excellent properties of reduced graphene oxide (rGO) and acetylene black (AB), and the electrochemical behavior of tyrosine (Tyr) on the modified electrode (denoted as rGO/ABPE) was investigated in detail. The electrochemical responses obtained on the sub-millimeter rGO/ABPE were compared with that obtained on a conventional size electrode with diameter of 3 mm. The results showed that the 0.8 mm one has better performance than that of 3 mm. Compared with the paste electrode made of graphite powder, the oxidation peak current of Tyr increased significantly due to the synergistic effect of rGO and AB. Under the optimized experimental conditions, the calibration curve of Tyr showed a linear relationship between 0.1 and 100 ?M (R = 0.9995) with good sensitivity of 3.314 ?A ?M-1 cm-2, and the detection limit was 0.06 ?M. By comparison with conventional size electrode, the detection of Tyr on the sub-millimeter electrode shows higher sensitivity, wider linear range and lower detection limit. In addition, the excellent reproducibility, stability and selectivity of the sub-millimeter rGO/ABPE make it suitable for Tyr analysis in both food and biological samples.
摘要：
<jats:p>High levels of uric acid (UA) in the human body usually cause diabetes, hypertension and atherosclerosis, kidney diseases, and neurological diseases. Hence, it is important to develop sensitive methods for UA determination. In this paper, nanocomposite composed of ceria nanoparticles and reduced graphene was successfully modified on the surface of glassy carbon electrode (ceria NPs-rGO/GCE) by a simple electroreduction method. The morphology, structure and property of the ceria NPs-rGO/GCE was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV). The electrocatalytic activity of the ceria NPs-rGO/GCE for uric acid (UA) oxidation was studied in detail. The results showed that the ceria NPs-rGO/GCE exhibited excellent selectivity and high sensitivity for UA detection. In 0.05 M H<jats:sub>2</jats:sub>SO<jats:sub>4</jats:sub> solution, a linear range of 0.02–20 <jats:italic>μ</jats:italic>M and a low detection limit of 8.0 nM of UA were obtained on the ceria NPs-rGO/GCE. This developed method was successfully applied for the detection of UA in human serum and urine samples, and its recoveries reached 95.8%-105.0%.</jats:p>
<jats:p>
<jats:inline-formula>
<jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="jesac4376-ga.jpg" xlink:type="simple" />
</jats:inline-formula>
</jats:p>
摘要：
<jats:title>Abstract</jats:title><jats:p>Metal–organic frameworks (MOF) are recently developed coordination porous materials, and their unique structures are very conducive to catalytic reactions. In this paper, <jats:italic>p</jats:italic>‐benzenedicarboxylic acid (PBA)‐Ni<jats:sup>2+</jats:sup> MOF materials (denoted as PBA‐Ni‐x, where <jats:italic>x</jats:italic> represents the initial ratio of PBA to Ni<jats:sup>2+</jats:sup>) were synthesized by a hydrothermal method and characterized by X‐ray diffraction (XRD), Fourier transform infrared spectra (FTIR), scanning electron microscopy (SEM), thermogravimetric analysis (TGA) and N<jats:sub>2</jats:sub> gas adsorption. H<jats:sub>2</jats:sub> gas was produced using the synthesized MOF as a photocatalyst and Eosin Y as a photosensitizer. The dependence of the special surface area and thickness of the nanosheets of Ni‐MOF on the initial ratio of PBA to Ni<jats:sup>2+</jats:sup> (PBA/Ni<jats:sup>2+</jats:sup>) was investigated. The BET surface areas of PBA‐Ni‐1 PBA‐Ni‐2 and PBA‐Ni‐3 are 11.00, 24.61 and 13.04m<jats:sup>2</jats:sup>g<jats:sup>−1</jats:sup>, respectively. And the thicknesses of nanosheets are approximately 600–1000, 200–500 and 300–700nm. Among the three materials, PBA‐Ni‐2 has the thinnest sheet‐like structure and largest surface area. Thus, it displays the highest H<jats:sub>2</jats:sub> evolution rate of 20.0μmolh<jats:sup>−1</jats:sup>. The noble‐metal‐free hydrogen production system is valuable for the application of MOF materials in photocatalytic water splitting.</jats:p>
