INORGANICA CHIMICA ACTA
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2017
·
IF 2.002
Xin Li,Dandan Zhang,Zihui Liu,Ying Xu,Dongfeng Wang
Organophosphorus pesticides are a class of the most important groups of insecticides and are widely applied to pest and plant diseases control in agriculture. The extensive application of organophosphorus pesticides can subsequently release organophosphorus pesticides into environment which may pose a seriously adverse impact to non-target organisms and humans. However, we could not ban organophosphorus pesticides at present as they are very efficient. Therefore, the new technique of degradation of organophosphorus pesticides must be studied. In this paper, a ternary copper Schiff base complex 2Cu(C 14 H 8 NO 3 Cl)(C 12 H 8 N 2 )·3CH 3 OH was synthesized and characterised by physico-chemical and spectroscopic methods. The degraded effects of 4 pesticides by the complex were investigated. The results showed that the degraded rates of every organophosphorus pesticide were increased. However, the effects of degradation were varied because of the different molecule structures of organophosphorus pesticides. Gas chromatography-mass spectrometry (GC–MS) and ion chromatography were used to analyze the degradation products by the complex, and then the catalytic mechanism of degradation was proposed. The study results suggest that the Schiff base copper complex, as a potent catalyzer, may find its applications in catalytic degradation area.
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JOURNAL OF HAZARDOUS MATERIALS
·
2016
·
IF 4.836
Chunzhen Fan,Kan Li,Juexiu Li,Diwen Ying,Yalin Wang,Jinping Jia
In this paper, tetraethylenepentamine (TEPA) modified chitosan/CoFe 2 O 4 particles were prepared for comparative and competitive adsorption of Cu(II) and Pb(II) in single and bi-component aqueous solutions. The characteristics results of SEM, FTIR and XRD indicated that the adsorbent was successfully fabricated. The magnetic property results manifested that the particles with saturation magnetization value of 63.83 emu g −1 would have a fast magnetic response. The effects of experimental parameters including contact time, pH value, initial metal ions concentration and coexisting ions on single and bi-component adsorption were investigated. The results revealed that the adsorption kinetic was followed pseudo-second-order kinetic model, indicating that chemical adsorption was the rate-limiting step. Sorption isotherms were also determined in single and bi-component solutions with different mass ratio of Cu(II) to Pb(II) (Cu(II)/Pb(II)) and fitted using Langmuir and Freundlich isotherm models. A better fit for Cu(II) and Pb(II) adsorption were obtained with Langmuir model, with a maximum sorption capacity of 168.067 and 228.311 mg g −1 for Cu(II) and Pb(II) in single component solution, 139.860 and 160.256 mg g −1 in bi-component solution (Cu(II)/Pb(II) = 1:1), respectively. The present results suggest that TEPA modified chitosan/CoFe 2 O 4 particles are feasible and satisfactory adsorbent for efficient removal of Cu(II) and Pb(II) ions.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2022
·Vol. 169
·期 5
·056523
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IF 4.386
Chuanhui Zhu,Guo-Hong Cai,Chongyang Yuan,Bin Huang,Guangqin Li,Mark Croft,Martha Greenblatt,Man-Rong Li
Exploring a simple model system to realize the intrinsic guidelines of activity for oxide electrocatalysts is urgent and important. Here, we introduce delafossite oxides A2IrO3 (A = Li, Na, Cu) as a family of oxygen evolution reaction electrocatalysts in alkaline media. We show that, in Cu2IrO3, the intrinsic intersite charge transfer between Cu and Ir improves the electrocatalytic activity by simultaneously increasing the conductivity and reducing the Tafel slope down to 51 mV dec−1 with an overpotential η10 = 361 mV. Through a comparative study, the improved activity of Cu2IrO3 is attributed to the increase of Ir 5d projected electronic density of states with extended Ir–O bond length. This study provides insights into advanced catalyst design through tailoring the active site of oxides by the modulation of electronic states in a given structural motif.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2020
·
IF 16.683
Dejin Zang,Qi Li,Guoyong Dai,Mengyan Zeng,Yichao Huang,Yongge Wei
Electrocatalytic CO 2 reduction reaction (CO 2 RR) is a promising pathway for storage of renewable electricity and converting CO 2 into value-added products. It`s highly desired to obtain acetic acid via CO 2 RR since it`s an important chemical feedstock and high energy-density liquid fuel. However, developing highly efficient electrocatalysts for selective CO 2 RR toward acetate remains formidable challenge. We report an interface engineering strategy to modify copper nanocubes with polyoxometalate (POM) to generate Cu–O–Mo interface as active sites for CO 2 RR, achieving state-of-the-art activity with 48.68% acetate formation Faradaic efficiency and current density of ∼110 mA cm −2 at -1.13 V vs RHE. DFT calculations suggest the interface of Cu planes and polyoxometalate clusters with abundant Cu–O–Mo active sites promote the generation of *CH 3 and successive coupling with CO 2 insertion, showing a potential dependence of acetate production. This work provides a Cu–O–Mo interface model for the rational design of earth-abundant metal based electrocatalysts for CO 2 RR and other renewable energy conversions.
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Catalysis Science & Technology
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2020
·Vol. 10
·期 13
·4412-4423
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IF 5.721
Qiang Liu,Zhenbo Zhao,Masahiko Arai,Chao Zhang,Ke Liu,Ruhui Shi,Peixuan Wu,Zhuangqing Wang,Weiwei Lin,Haiyang Cheng,Fengyu Zhao
The transformation of γ-valerolactone (GVL) into 1,4-pentanediol (1,4-PDO) and 2-methyltetra-hydrofuran (2-MTHF) in the presence of H2, one of the useful biomass conversion and utilization processes, was investigated with monometallic Cu/Al2O3 and bimetallic ZnCu/Al2O3 catalysts. A 10 wt% Cu-loaded monometallic catalyst produced 1,4-PDO and 2-MTHF in comparable quantities at a medium conversion (∼50%). When Zn was added in a range of Zn/Cu molar ratios of up to 2, in contrast, the catalysts yielded 1,4-PDO in a high selectivity of about 97% at low and high conversion levels. In addition, the 1,4-PDO selectivity over the ZnCu/Al2O3 catalysts remained almost unchanged during recycled runs. That is, the addition of Zn to Cu/Al2O3 switched the product selectivity and improved the catalyst stability and reusability. Furthermore, the physicochemical properties of the catalysts were characterized by several methods including XRD, TEM, TPR, XPS, FTIR of adsorbed pyridine, and so on. On the basis of those results, the relationships between the catalytic performance (activity, selectivity, and reusability) and the catalyst structural features were discussed.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Zelong Wang,Yanan Zhang,Jungang Yi,Ning Cai,Jia Guo
Heat accumulation has emerged as a critical issue that affects the performance and reliability of modern electronic devices in their evolving toward miniaturization, high power density and high integration. The application of thermal interface materials (TIMs) as a thermal management strategy is commonly employed to tackle this problem. Herein, we report the development and characterization of highly thermally conductive but electrically insulating Cu@Al 2 O 3 /epoxy composites. Stemming from the excellent thermal conductivity of Cu, the Cu@Al 2 O 3 /epoxy composites exhibit thermal conductivity of 1.32 W/m·K at 10 vol% filler content , which is nearly 7 times higher than that of the epoxy resin . Simultaneously, the Cu@Al 2 O 3 /epoxy composites still retain a high electrical resistivity of 2.3 × 10 13 Ω·cm, which is 6 orders of magnitude greater than that of Cu/epoxy composites without Al 2 O 3 barrier layers, because the dense nanoscale insulating Al 2 O 3 shell effectively inhibits the electron transfer . In addition, the Cu@Al 2 O 3 /epoxy composites possess lower dielectric constant and dielectric loss , and better mechanical properties than those of Cu/epoxy composites.
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Carbon Capture Science & Technology
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2023
·
IF 0
Bowen Lu,Fan Wu,Xiaoshan Li,Cong Luo,Liqi Zhang
The interfacial structure of metal and oxide support plays a pivotal role in reverse water gas shift (RWGS). However, rare work investigated the factor of the metal-oxide interface during RWGS reaction. In this work, the interface of Cu/CeO 2 catalysts was designed through the thermal treatment of copper nitrate salt on CeO 2 with an H 2 atmosphere under different temperatures, and CO 2 hydrogenation performance was studied at 400 °C to investigate the effect of interfacial structure on RWGS reaction. Among these prepared catalysts, Cu/CeO 2 -400 catalysts achieved the best CO 2 conversion activity (CO production rate 1.23 mol/g cat . h). Cu interacted with CeO 2 to form Cu-O-Ce interface and induced more oxygen vacancy formation. The oxygen vacancy around the Cu-CeO 2 interface enhanced CO 2 adsorption and promoted CO 2 conversion. CO 2 reacted with active hydrogen to COOH, then COOH species dissociated into CO and OH adsorbed on the surface of Cu-CeO 2 . These results gave insights into the design of a highly effective catalyst for CO 2 hydrogenation.
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Catalysis Science & Technology
·
2024
·
IF 4.4
Bin Guan,Junyan Chen,Zhongqi Zhuang,Lei Zhu,Zeren Ma,Xuehan Hu,Chenyu Zhu,Sikai Zhao,Kaiyou Shu,Hongtao Dang,Zhen Huang
As a significant technology of CO2 utilization, artificial CO2 photoreduction has received more and more attention. Herein, g-C3N4 catalysts modified with Bi and/or Cu for CO2 photothermal reduction were prepared by solvothermal synthesis and impregnation methods. Performance evaluation and physicochemical and photo- and thermochemical characterization indicated that Bi and Cu modification effectively enhanced the photo-absorption properties of g-C3N4 catalysts, improving charge transfer efficiency and catalytic performance. Compared with single-metal modification, Bi and Cu co-modification showed a narrower bandgap and more excellent light and CO2 absorption capacity, suggesting a certain synergistic effect of Bi and Cu co-modification. The alteration of the light absorption properties may be related to the surface plasmon effect of Bi and Cu, and the co-loading of Bi and Cu can exacerbate the effect, which can effectively enhance the photoresponsivity of the catalysts, leading to higher catalytic performance.
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SENSORS AND ACTUATORS B-CHEMICAL
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2023
·
IF 8.4
Li Yang,Qixin Chen,Yiheng Yuan,Xishun Peng,Xinghua Li,Cheng Zuo,Zhangyu Zhou,Zhongchen Bai
Detecting γ-aminobutyric acid (GABA) in the mammalian body is vital for diagnosing neurological disorders. Here, we introduced a novel SERS sensor based on metal-semiconductor heterojunction ZnO/Cu@Ag substrate for highly sensitive detecting GABA molecules. The ZnO/Cu@Ag substrate fully leverages the electromagnetic field enhancement effect and the chemical enhancement effect of metal-semiconductors heterojunction, exhibiting an excellent enhancement factor of 2.23 × 10 6 and a low limit-of-detection (LOD) of 3.84 nM for GABA molecules in water. Moreover, the ZnO/Cu@Ag substrate could recognize 10 nM GABA molecules in human serum. This GABA SERS sensor provides a reliable tool and technological support for research and applications in neuroscience and medicine.
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WATER SCIENCE AND TECHNOLOGY
·
2023
·Vol. 87
·期 5
·1202-1213
·
IF 2.7
Liu Zhenzhong,Wu Yang,Wan Siwen,Wang Boyan,Ji Hongliang,Xiang Xiaofang
View large Download slide View large Download slide Close modal Compared with the common synthesis methods of metal-organic frameworks (MOFs), Co/Cu-based bi-MOFs composite catalyst Co X Cu (10− X ) -MOFs ( X = 2, 4, 6, and 8) was prepared by a facile synthesis method at room temperature. The bi-MOFs composite catalyst was characterized by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), and X-ray diffraction (XRD). The removal ability of sulfamethoxazole (SMX) by different Co:Cu rate bi-MOFs composite catalysts, single Co-based MOFs (zeolitic imidazolate framework-67, ZIF-67), and Cu-based MOFs (Hong Kong University of Science and Technology-1, HKUST-1) were investigated and the effects of peracetic acid (PAA) concentration, catalyst dosage, the common interfering substances (Cl − , HCO 3 − , SO 4 2− , HA) in water, and SMX removal were investigated. Through the analysis of different free radical scavengers and the changes of surface elements before and after the reaction, the oxidation mechanism was further explored, and the stability of Co 4 Cu 6 -MOFs was explored through repeated recycling. The experimental results demonstrate that Co 4 Cu 6 -MOFs have a high catalytic activity for PAA. Co 4 Cu 6 -MOFs/PAA show the best removal effect of SMX under neutral conditions and the presence of Cl − and HCO 3 - can promote the removal of SMX. Co 4 Cu 6 -MOF composites were synthesized and used for SMX removal. Application of PAA activation catalyst to generate R–O• for SMX removal. The effects of different environmental factors on the removal of SMX were discussed.
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Progress in Natural Science-Materials International
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2021
·
IF 3.607
Jiaojiao Zheng,Bing Bai,Qiumei Di,Zhuoli Jiang,Meng Xu,Jiatao Zhang
In II-VI group, the doping in CdTe nanocrystals (NCs) is more difficult than other chalcogenides. In this communication, CdTe nanocrystals containing Cu impurities were carefully synthesized based on controlled reverse cation exchange process between as-prepared Cu 7 Te 5 nanocubes and Cd 2+ ions. By well-defined Cu 7 Te 5 nanocubes, the obtained CdTe NCs kept the original morphology. The concentration of Cu impurities in CdTe NCs was controlled by the regulation such reverse cation exchange. Additionally, the regulation from band gap (BG) photoluminescence (PL) to the coexistence of the bandgap emission, dopant emission, and surface-state emission was realized. This tailoring from undoped to doped emission in the case of Cu impurities is helpful to study the Cu related doping in telluride NCs.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2023
·Vol. 170
·期 7
·077509
·
IF 3.9
Qi Wang,Wenjing Liu,Jinjin Zhang,Jianying Qu
In this work, Cu/N-C derived from MOF composites were synthesized and characterized by SEM, XRD, FTIR, XPS and EIS, which was modified on the glassy carbon electrode (GCE) to construct a novel electrochemical sensor (Cu/N-C/GCE). Due to the good electrical conductivity and abundant catalytic active sites of Cu/N-C, Cu/N-C/GCE exhibited excellent electrocatalytic performance for catechol (CC) and hydroquinone (HQ) with the oxidation peak potential difference of 112 mV. The proposed sensor could realize the simultaneous detection of CC and HQ successfully. Under optimal conditions, the redox peak currents of both CC and HQ have good linear relationship with their concentrations in the ranges of 0.50–100.00 μM and 0.50–150.00 μM with the detection limits for CC and HQ of 0.12 μM and 0.09 μM, respectively. At the same time, the sensor exhibits good stability, reproducibility and selectivity in the analysis of practical samples.
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