MICROCHEMICAL JOURNAL
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2026
·
IF 5.2
Rong Guo,Hong Liu,Qian He,Xiangyang Chen,Ye Ma,Minggang Zhao
CuO/Cu-TCPP was prepared by a low-energy and environmental condition process. • Interfacial barrier–driven sensing mechanism ensures high anti-interference ability. • The Cu-TCPP acts as a adsorption layer, enriching glyphosate and resisting interference. • Glyphosate adsorption dynamically tunes the heterojunction barrier for detection. • The sensor achieves 1.27 nM LOD and reliable performance in complex matrices. The widespread use of glyphosate has posed significant threats to the environment and human health, underscoring the importance of accurately detecting glyphosate in diverse environmental. However, conventional electrochemical sensors often rely on enzyme-mediated recognition to achieve selectivity, making them susceptible to environmental interference and limiting their practical applicability. Herein, we report a tunable barrier–driven sensor based on CuO/Cu-TCPP core-shell structure for highly sensitive and selective GLY detection. The Cu-TCPP shell serves dual functions: acting as a specific adsorption layer to selectively enrich glyphosate while repelling competing molecules, and serving as a physical gating switch that dynamically modulates the heterojunction barrier through adsorption of negatively charged glyphosate to trigger efficient electron transfer. Crucially, this physical-gating-based barrier modulation mechanism exponentially amplifies the current signal while physically shielding interference from analogous redox species, thereby achieving highly selective and sensitive detection. The fabricated sensor demonstrates a broad linear response (60–6000 nM) with an ultralow detection limit of 1.27 nM, supporting its potential application in environmental monitoring. More broadly, this work provides mechanistic insight into adsorption-regulated interfacial barrier modulation and offers a strategy for the rational design of enzyme-free electrochemical sensors for environmental contaminants. In this study, a CuO/Cu-TCPP core-shell heterostructure was constructed for glyphosate sensing. The Cu-TCPP shell serves both as a specific adsorption layer and a responsive switch. On the one hand, it can enrich glyphosate and suppress interfering substances. On the other hand, glyphosate adsorption can regulate the potential barrier at the heterojunction interface, promote electron transfer and trigger electrochemical signals. Under light exposure, its performance improvement is more obvious. This mechanism significantly enhances the sensing sensitivity and selectivity. The sensor maintains good linearity within the range of 60–6000 nM, with a detection limit as low as 1.27 nM. It also demonstrates stable and reliable detection performance in complex environmental samples, providing a new strategy for high-performance organophosphorus pesticide sensing. Download: Download high-res image (132KB) Download: Download full-size image
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INORGANICA CHIMICA ACTA
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2016
·
IF 1.918
Xuefang Shang,Kui Ren,Jie Li,Wanli Li,Jiajia Fu,Xueli Zhang,Jinlian Zhang
A new copper(II) complex based on Schiff bases of 3-nitrosalicylaldehyde was synthesized and the crystal was also obtained fortunately. Its structure was well characterized by single-crystal X-ray diffraction and HRMS. The complex showed the strongest binding ability and high selectivity for hydrogen sulfide among other anions (AcO − , H 2 PO 4 − , F − , Cl − , Br − and I − ) at neutral pH in organic-aqueous solutions. The possible mechanism was the copper ion was released and combined with hydrogen sulfide after the anion was added. In addition, the further application of the sensor was applied to hela cells cytotoxicity. The above results indicated the copper(II) complex could be used as a sensor for the detection of HS − in the sample of environment, pharmacy, and etc. More importantly, the copper(II) complex also exhibited effective and wide antibacterial activity.
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CATALYSIS TODAY
·
2019
·
IF 4.888
Yunxia Zhao,Hui Ge,Yuanyuan Miao,Jiaxin Chen,Wei Cai
Metal-organic framework (MOF) materials have significant advantages for capturing CO 2 . To further improve the CO 2 adsorption performance of MOFs, a compound material of l -arginine modified graphene oxide (GO) with MOFs (MOF/GO-Arg) was synthesized. Introduction of amino acid-functionalized lamellar GO into MOF material not only generated new pores at their interface to improve the adsorption of the MOF but also promoted the CO 2 capture at low humidity. The structural and chemical properties of the parent components and composite materials were analyzed by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), N 2 adsorption-desorption, thermal analysis and scanning electron microscopy (SEM). The dynamic CO 2 adsorption properties of the materials were compared under different temperatures, flow rates and humidities. Three kinetic models were used to fit the adsorption curves of the as-synthesized adsorbents under different conditions, and then the optimal dynamic model was determined. Since the reusability of the adsorbents is especially important for the use of these materials in practice, the CO 2 adsorption was repeated for 10 cycles under optimal temperature, flow rate and high humidity conditions.
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高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2021
·
IF 4.464
Ping Qiu,Shouwu Xu,Kaili Zhang,Zhongyuan Jiang,Daming Gong,Changfeng Chen
Cu@Cu 2 O films were prepared by electrochemical deposition method. The obtained Cu@Cu 2 O films were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), confocal Raman spectroscopy (CRS), UV–visible absorption spectroscopy and Photoluminescence (PL) spectroscopy. Electrochemical measurements were performed under intermittent visible light illumination to assess the photoelectrochemical cathodic protection effect of the prepared Cu@Cu 2 O films. The results indicated that a lower deposition potential could facilitate the reduction of Cu 2 O grain size together with an increase number of Cu. But the deposition potential has no obvious influence on the band-gap of the composite films, which exhibited n-type semiconductor properties. The open circuit potential of 304 stainless steel by coupling with the Cu@Cu 2 O-0.3 V films presented the most negative shift of −179 mV under visible-light illumination. The related photocurrent density was 0.13 mA·cm −2 . The photoelectrochemical conversion mechanism and the photoelectrochemical cathodic protection effects of the Cu@Cu 2 O films were discussed in detail.
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RSC Advances
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2016
·Vol. 6
·期 30
·25185-25190
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IF 3.289
Zhi-Qiao Wang,Zhong-Ning Xu,Ming-Jian Zhang,Qing-Song Chen,Yumin Chen,Guo-Cong Guo
High-performance catalysts are the key factor for CO2 activation and conversion. In this paper, we systematically investigate the whole composition evolution process of Cu/SiO2 catalysts for CO2 hydrogenation. The precursor gradually evolved from amorphous Cu species to copper phyllosilicate, then to CuO with the increase of calcination temperature from ambient temperature to 700 °C. With the evolution of the precursor, the corresponding species after reduction were gradually evolved from Cu0 to Cu+, then to Cu0 again. The ratios of Cu+/(Cu+ + Cu0) are positively correlated with the catalytic activities. The Cu+ species derived from copper phyllosilicate were demonstrated to be crucial in achieving high-performance Cu/SiO2 catalysts for CO2 hydrogenation. The composition evolution has been demonstrated to be an efficient strategy to synthesize high-performance catalysts. This strategy of composition evolution can be applied to the synthesis of other high-performance Cu-based heterogeneous catalysts.
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Analytical Methods
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2012
·Vol. 4
·期 11
·3785-3791
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IF 1.547
Essy K. Fodjo,Sara Riaz,Da-Wei Li,Lu-Lu Qu,Niamien P. Marius,Trokourey Albert,Yi-Tao Long
A Surface Enhanced Raman Scattering (SERS) substrate based on Ag/β-AgVO3 nanobelts deposited on copper foil (Cu@Ag/β-AgVO3) was used for the detection of carbamate pesticides: carbofuran, carbaryl, isoprocarb and propoxur. Cu@Ag/β-AgVO3 has shown an excellent SERS activity for carbamate pesticides compared to silver nanoparticles (AgNPs). Under optimized conditions, detection limits of 2.5 pM, 10 pM, 50 pM and 75 pM were obtained for carbaryl, carbofuran, isoprocarb and propoxur respectively, suggesting that Cu@Ag/β-AgVO3 is a good candidate for use as a SERS substrate for the trace level detection of these pesticides.
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Materials
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2021
·Vol. 14
·期 20
·5958
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IF 3.623
Xusheng Ren,Zhiliang Ou,Bang Wu
The activated coke is a promising support for catalysts, and it is important to study the performance of the activated coke catalyst on the removal of NOx. In the current research, a series of the activated coke-supported Mn–Cu catalysts are prepared by the incipient wetness impregnation method. The effects of the molar ration of Mn/Cu, the content of Mn–Cu, the calcination temperature, and reaction space velocity on NO conversion are investigated, and it was found that the 8 wt.% Mn0.7Cu0.3/AC had the best catalytic activity when the calcination temperature was 200 °C. The existence of SO2caused the catalyst to deactivate, but the activity of the poisoning catalyst could be recovered by different regeneration methods. To uncover the underlying mechanism, BET, XPS, XRD, SEM and FTIR characterizations were performed. These results suggested that the specific surface area and total pore volume of the poisoning catalyst are recovered and the sulfite and sulfate on the surface of the poisoning catalysts are removed after water washing regeneration. More importantly, the water washing regeneration returns the value of Mn3+/Mn4+, Cu2+/Cu+, and Oα/Oβ, related to the activity, basically back to the level of the fresh catalyst. Thus, the effect of water washing regeneration is better than thermal regeneration. These results could provide some helpful information for the design and development of the SCR catalysts.Keywords:activated coke;low-temperature NH3-SCR;sulfur poisoning;regeneration
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PubMed
高影响因子
Catalysts
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2022
·Vol. 12
·期 9
·1049
·
IF 4.501
Yan Hao,Dajie Zhao,Wen Liu,Min Zhang,Yixiao Lou,Zhenzhen Wang,Qinghu Tang,Jinghe Yang
Selective dehydrogenation of ethanol to acetaldehyde has been considered as an important pathway to produce acetaldehyde due to the atom economy and easy separation of acetaldehyde and hydrogen. Copper catalysts have attracted much attention due to the high activity of Cu species in O-H and C-H bonds oxidative cleavage, and low process cost; however, the size of the Cu nanoparticle is difficult to control since it is easily suffers from metal sintering at high temperatures. In this work, the Cu/KIT-6 catalyst exhibited an ultra-high metal dispersion of 62.3% prepared by an electrostatic adsorption method, due to the advantages of the confinement effect of mesoporous nanostructures and the protective effect of ammonia water on Cu nanoparticles. The existence of an oxidation atmosphere had a significant effect on the valence state of copper species and enhancing moderate acid sites. The catalyst treated by reduction and then oxidation possessed a moderate/weak acid site ratio of ~0.42 and a suitable proportion of Cu+/Cu0ratio of ~0.53, which conceivably rendered its superior ethanol conversion of 96.8% and full acetaldehyde selectivity at 250 °C. The catalyst also maintained a high selectivity of >99% to acetaldehyde upon time-on-stream of 288 h.Keywords:copper;ethanol dehydrogenation;mesoporous silica
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高影响因子
Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 33
·17413-17420
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IF 8.867
Fei He,Li Mi,Yanfei Shen,Xinghua Chen,Yiran Yang,Hao Mei,Songqin Liu,Toshiyuki Mori,Yuanjian Zhang
Owing to the well-defined molecular structure and tunable mono-, di- or multinuclearity, Cu–N complexes have recently drawn specific attention as emerging catalysts for sustainable electrocatalytic oxygen reduction reaction (ORR) and other reactions. However, compared to state-of-the-art Pt/C, most of these Cu-based molecular catalysts show low catalytic activity due to the intrinsically limited capability and challenges in electronic structure modulation and sequential electron transfer within a single small molecule. Herein, inspired by structure–property relationships of laccases (a type of macromolecular biological catalyst), we report a facile molecular assembly of Cu(3,3′-diaminobenzidine) polymeric complex on carbon black via Cu–N complexing and π–π interaction as a highly efficient bifunctional electrocatalyst for ORR and hydrazine oxidation reaction (HOR), two half reactions for hydrazine fuel cells. Similar to the function of the Cys–His group in natural laccases, the 3,3′-diaminobenzidine ligand in the proposed polymeric catalyst synergistically adjusted the electronic structure of the Cu–N complex center and mediated a multiple-electron transfer cooperatively with carbon black via a long-range π–π interaction, owing to its electron reservation and π-conjugated properties. This study may provide a new way to design highly efficient biomimetic noble-metal-free electrocatalysts with well-defined and tunable structures.
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SCIENCE OF THE TOTAL ENVIRONMENT
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2022
·
IF 10.753
Yingdong Chen,Rongze Sun,Wentao Yan,Mengyao Wu,Yong Zhou,CongJie Gao
In many important industries, such as the textile printing industry, a large amount of dye/salt wastewater is often discharged, which can destroy the ecological environment of the water body. Membrane technology has a great potential in the treatment of environmental problems caused by dye/salt wastewater. Polyvinyl alcohol (PVA) nanofiltration (NF) membrane has a bright future in dye/salt wastewater treatment , however, works on this are rare. Herein, antibacterial PVA NF membrane incorporated with Cu(OH) 2 nanowires for the dye/salt wastewater treatment is reported. The membrane was prepared via coating the solutions containing PVA, glutaraldehyde and Cu(OH) 2 nanowires on the polyethersulfone ultrafiltration membrane. Cu(OH) 2 nanowires has a diameter of 60 nm and was successfully introduced into the membrane. The introduction of nanowires improved the membrane hydrophilicity and roughness, which is conducive to the improvement of membrane flux. Membrane separation performance for one component solution and dye/salt solution were investigated. The introduction of Cu(OH) 2 increases the flux of the membrane obviously (the highest increase is 178.78% (from 21.49 to 38.42 L·m −2 ·h −1 ·bar −1 , for NaCl solution as the feed). Besides, the membrane doped with nanowires also possessed a high dye/salt selectivity . For one component solution, the dye removal rate was over 97.00% while the salt rejection was low (the lowest was 13.18% (NaCl)). For the dye/salt solution, the dye (Congo Red) rejection kept at a high level (98.91%) and the salt (NaCl) rejection was still low (13.71%), while the flux was also high (37.56 L·m −2 ·h −1 ·bar −1 ). The performance is superior to that of many membranes reported in previous works. Moreover, the Cu(OH) 2 nanowires endowed the membrane with an improved and high antibacterial property. The sterilization rate of Escherichia coli and Staphylococcus aureus reached more than 99.99%.
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PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2022
·
IF 6.371
Guannan Yang,Pengyu Wang,Yu Liu,Shuzhou Lu,Bo Luo,Tao Lai,Shiwo Ta,Tingyu Lin,Jiye Luo,Yu Zhang,Chengqiang Cui
Ag-coated Cu particles (Cu@Ag particles) are highly anticipated bimetallic materials with wide electronic applications. However, it is still crucially challenging to obtain well-covered Ag shells and facilitate the synthetic process, and the sintering/migration behaviors of Cu@Ag particles are also poorly understood. In this study, we develop a facile Ag coating method for Cu@Ag particles with the assistance of double complexing agents. Electrochemical analysis reveals that the complexing effect can effectively reduce the potential difference of the Cu-Ag replacement reaction, and thereby improve the coating quality. Cu@Ag particles with compact and uniform Ag shells are obtained, with Ag contents as low as ~10 at%. The as-prepared Cu@Ag particles show significantly improved oxidation resistance and reliable sintering property. Moreover, the Cu@Ag particles exhibit superior ion migration resistance even better than both Cu and Ag particles under an oxygen-containing environment. The results could provide helpful basis for understanding the synthesis, sintering and migration processes of Cu@Ag particles. The comprehensive performance of Cu@Ag particles makes them a promising interconnected material in future electronic industry.
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Catalysis Science & Technology
·
2019
·Vol. 9
·期 23
·6749-6759
·
IF 5.726
Wei Chen,Tongyang Song,Jingxia Tian,Peng Wu,Xiaohong Li
Indirect CO2 conversion to ethylene glycol (EG) and methanol (ME) via CO2-derived ethylene carbonate (EC) as the intermediate is an attractive and promising approach. Cu-Based catalysts have been regarded as effective catalysts for the hydrogenation of EC to yield ME and EG. In this work, we prepared Cu/SiO2 catalysts through different methods for the hydrogenation of EC to yield ME and EG. The results show that Cu/SiO2-AE catalysts prepared by an ammonia evaporation (AE) method are superior to Cu/SiO2-DP catalysts prepared by a deposition–precipitation (DP) method. After modification using glucose with an optimal amount, the Cu8G1/SiO2-AE catalysts showed enhanced catalytic performance, furnishing 86% selectivity to ME and 99% selectivity to EG at almost full conversion of EC, with a TOF value for ME formation reaching about 39 h−1. A series of techniques such as N2 sorption, ICP-AES, FT-IR, H2-TPR, H2-TPD, TEM, and XPS were adopted to characterize the physicochemical properties of relevant catalysts. It was found that the Cu/SiO2-AE catalyst had a smaller Cu particle size. After modification with glucose, the Cu8G1/SiO2-AE catalyst had the smallest Cu particle size, the highest hydrogen adsorption ability, and the strongest interaction of Cu with SiO2 so that the highest Cu+/(Cu0 + Cu+) molar ratio was detected. In addition, upon investigation of catalyst stability and reusability, it was found that glucose modification for the Cu/SiO2-AE catalyst can also alleviate the deactivation distinctly.
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