NEW JOURNAL OF CHEMISTRY
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2020
·Vol. 44
·期 42
·18173-18184
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IF 3.288
Yi-Hu Ke,Xue Wang,Hong-Yu Qin,Hai Liu,Hong Yuan,Chun-Ling Liu,Wen-Sheng Dong
A series of Au catalysts supported on Cu–Al composite oxides were prepared and applied for the selective catalytic oxidation of glycerol to 1,3-dihydroxyacetone (DHA) in base-free conditions. The optimal Au/CuAlO-3 catalyst (the molar ratio of Cu/Al was 5 : 1) exhibited the best performance, and reached the glycerol conditions of 76.7% and DHA selectivity of 97.3% under the optimized reaction conditions. The high catalytic activity of the Au/CuAlO-3 catalyst correlated to the large concentration of surface-active oxygen species, the low reduction temperature of the support, the small size of Au nanoparticles (NPs) and the interactions between Au NPs and the support. This work demonstrates that Cu–Al composite oxides are promising supports for selective catalytic oxidation of glycerol to DHA, and may offer guidelines for designing efficient support for the selective conversion of glycerol to other high value-added products.
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ELECTROCHIMICA ACTA
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2020
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IF 6.215
Junying Huang,Mengting Chen,Tao Tang,Weipeng Liu,Yingju Liu
The self-supporting catalytic electrode is useful in the industry, since it can reduce the complex pre-treatment of catalytic materials and avoid the use of binders. In this work, a ternary self-supporting electrode including Cu mesh-supported graphene and molybdenum disulfide (MoS 2 ) was prepared by electroplating zinc and hydrothermal reaction . Due to the excellent conductivity of copper and the hydrogen evolution catalytic ability of MoS 2 , this self-supporting electrode showed a low Tafel slope as 54 mV dec −1 and a current density of 400 mA cm −2 at an overpotential of -300 mV in hydrogen evolution reaction (HER). In addition, due to the metal flexibility of the Cu mesh substrate, the MoS 2 –rGO Cu ternary self-supporting electrode can be bent or cut into any desired shape. Even shaped as an elongated one, curved "S", this self-supporting electrode still kept itself from any deformation when hydrogen bubbles were rapidly generated. Therefore, a strategy for green, simple, and low-cost self-supporting electrode was provided, which may increase the large-scale operation of the catalytic electrode in HER.
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Materials Today Chemistry
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2024
·
IF 6.7
Zhizhu Yue,Yonghe Yu,Tianjun Hu,Ying Wang,Lulu Cao,Yanxia Zhang,Yuhong Chang,Linjuan Pei,Jianfeng Jia
The development of economical multiphase photocatalysts is a significant challenge in achieving large-scale industrialization. Rational catalyst design can help in achieving efficient, energy-saving, and green catalytic reactions, making it more feasible to screen potential catalyst candidates. In this paper, we have successfully developed a high-efficiency photocatalyst Cu-doped Cu 2 WO 4 (OH) 2 (CWOH-y, where y represents the molar ratio of copper tungsten source), which can catalyze the aerobic coupling reaction of amines to produce corresponding imines under visible light irradiation. N-benzylidenebenzylamine is synthesized under visible light at 25 °C with an 89 % yield. Under natural light at around 35 °C (mean light intensity of 50 mW/cm 2 ), 94 % of the benzylamine is converted, and 97 % of the product is N-benzylidenebenzylamine. The catalyst exhibits high efficiency due to the synergistic effect of doped Cu, Cu 2 WO 4 (OH) 2 , and visible light. This combination generates a significant amount of superoxide free radicals and singlet oxygen when exposed to visible light. Furthermore, the catalyst demonstrates universality and stability with a wide range of amine derivatives. This study introduces a new environmentally friendly photocatalytic pathway for the synthesis of imines and emphasizes the potential applications of Cu 2 WO 4 (OH) 2 .
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
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IF 7.489
Mengmeng Zhang,Gang Cheng,Yi Wei,Zhipan Wen,Rong Chen,Jinyan Xiong,Weijie Li,Chao Han,Zhen Li
Solar-driven reduction of CO 2 and H 2 O into fuels is a promising approach for addressing global warming and energy crisis. Herein, Cu + doped W 18 O 49 nanowires were prepared by a facile solvothermal method and applied in photocatalytic reduction of CO 2 . The composition and structure of pristine and Cu + doped W 18 O 49 samples have been characterized. It was found that the morphology of W 18 O 49 nanowires was changed with increasing amounts of dopant . The photocatalytic CO 2 reduction activity of W 18 O 49 nanowires and the Cu + doped W 18 O 49 samples were evaluated using H 2 O as reducing agent. The strategy of Cu + doping not only could affect the band edge position and the surface wettability , but also influenced separation of the photogenerated electron-hole pairs. It was found that Cu + doping could introduce oxygen vacancy and change the conduction edge to a more negative position for W 18 O 49 nanowires, which might be beneficial for the activation of CO 2 and promote the following CO 2 reduction. Furthermore, the higher separation efficiency of photogenerated electron-hole pairs with Cu + doping could contribute to the CO 2 photoreduction enhancement. In addition, the Cu + doped W 18 O 49 nanowires (Cu-W 18 O 49 -0.005) presented a relatively poor hydrophilic property , which might be beneficial for the adsorption of CO 2 molecules and contribute to its superior photocatalytic CO 2 reduction capability.
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Journal of Environmental Chemical Engineering
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2020
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IF 4.3
Lilan Huang,Leitao Zhang,Deyuan Li,Qingping Xin,Rui Jiao,Xiaoyang Hou,Yuzhong Zhang,Hong Li
Delicate design of hierarchical and porous nanoarchitectures has become a highly effective strategy to develop novel bimetallic catalyst with improved stability and catalytic performance. Herein, a core-shell hierarchical 4A zeolite/Fe@Cu Fenton-like catalyst with 4A zeolite/Fe as core components and two-dimensional Cu hydroxide nanosheets assemblies as shell structure was fabricated through a simple and scalable approach and used for phenol degradation. The results indicated that 4A zeolite/Fe@Cu bimetallic catalyst had higher catalytic activity and utilization efficiency of H 2 O 2 than that of 4A zeolite/Fe and 4A zeolite@Cu monometallic catalysts at near neutral pH. In the presence of H 2 O 2 , the 4A zeolite/Fe@Cu bimetallic catalyst could remove 95.3 % phenol after 4 h at pH 5, which was much higher than that of monometallic catalyst under the same condition. The enhanced activity of 4A zeolite/Fe@Cu was ascribed to the synergistic effect between the 4A zeolite/Fe (core) and two-dimensional Cu hydroxide nanosheets (shell). More importantly, the copper hydroxide nanosheets with open network structure on the surface of 4A zeolite/Fe@Cu improved the stability of the Fe(III) at acidic conditions, and avoided reduced catalytic efficiency of Fe(III) caused by embedding effect. This strategy provided guidance to the design of high-performance bimetallic Fenton-like catalysts.
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CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
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2020
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IF 0.936
Lan WU,Zhi-Wei LU,Ying MA,Jun-Jun ZHANG,Guang-Quan MO,Hai-Jun DU,Jian-Shan YE
A novel electrochemical non-enzymatic sensing system was fabricated based on carbon paste electrode (CPE) encapsulating copper metal-organic frameworks (Cu-MOF/CPE) for determination of glucose by chronoamperometry in alkaline media. The as-synthesized Cu-MOF exhibited high surface area and porous structures, and the presence of carbon pastes greatly improved the conductivity of the sensing electrode. This synergic effect led to the good catalytic activity of the resulting electrode toward glucose. Under the optimized experimental conditions, the oxidation peak currents were linearly dependent on glucose concentrations in a wide range of 5–3910 μmol/L and 3910–10950 μmol/L with a limit of detection (LOD) of 0.11 μmol/L and a short response time of 0.5 s. Moreover, the developed sensor showed long-time stability, excellent selectivity as well as high resistance towards interferences. This sensor was also applied to determination of glucose in serum samples with a satisfactory result, confirming its promising applications.
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CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Min Chen,Honghong Wang,Xueyan Chen,Fei Wang,Xiaoxiao Qin,Changbin Zhang,Hong He
Photocatalysis is regarded as a promising method for indoor formaldehyde (HCHO) removal, and there remains a strong demand for the development of highly efficient photocatalysts for HCHO oxidation under visible light. Herein, by grafting nano CuO x clusters onto TiO 2 , the higher performance is achieved over Cu-TiO 2 for the photocatalytic oxidation of HCHO under visible light compared with the typical photocatalysts N-TiO 2 and g-C 3 N 4 . It is found that the presence of water greatly promotes the activity of HCHO oxidation on Cu-TiO 2 . The characterization results indicate that the CuO x clusters on TiO 2 exhibit high redox reversibility between Cu (II) and Cu (I) and greatly facilitate the migration of electrons. The mechanism of photocatalytic oxidation of HCHO was explored by using in situ DRIFTS measurements and DFT calculations. It is shown that HCHO is firstly oxidized to dioxymethylene (DOM), and then DOM is transformed into formate species under visible light irradiation. DFT calculations results indicate that the OH species are responsible for surface formate decomposition, which is the rate-determining step, while O 2 − radical is not active in formate decomposition. Our findings improve the understanding on the photocatalytic oxidation of HCHO, and the Cu-TiO 2 catalyst is a promising candidate for practical application in indoor air purification.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2020
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IF 5.774
Jun Hu,Xinze Bian,Yi Xia,Mili Weng,Wan Zhou,Qizhou Dai
In this study, Cu doped PbO 2 electrode was prepared by electrodeposition and used for electrochemical oxidation degradation of amoxicillin (AMX), which showed that the effect of Cu doped PbO 2 electrode was better than that of undoped PbO 2 electrode in degrading amoxicillin. An optimized model was setup with the help of response surface method (RSM). The optimal values of experimental parameters and the interactions between the parameters were explored, including current density, pH and initial AMX concentration. The combustion efficiency was calculated in the electrochemical oxidation of amoxicillin in aqueous solution and the enhancement was found with Cu doped PbO 2 electrode. The enhanced mechanism with Cu doped PbO 2 electrode was discussed based on the analysis of hydroxyl radicals and the combustion efficiency. The mechanism of amoxicillin degradation was discussed. This paper can provide basic data and technique reference for amoxicillin pollution control.
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SURFACE & COATINGS TECHNOLOGY
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2020
·
IF 3.784
Weijing Zhao,Xinyan Xiao,Guangming Pan,Zhihao Ye
Cu species (Cu/Cu 2 O/CuO NPs) functionalized fabric (Cu-fabric) with superhydrophobicity was fabricated through a simple in-situ reduction from Cu(OH) 2 -coated-fabric and an immersion process in n-octadecathiol (ODT) solution, in which cotton fabric served as bio-support material to immobilize Cu 2+ in the presence of NH 3 ·H 2 O. The surface morphology , elements composition, elements valance state and functional groups were detected by SEM , EDS , XPS and ATR-FTIR, respectively, and a formation mechanism of the Cu-fabric was proposed. The as-prepared Cu-fabric showed superhydrophobicity to deionized water, with a water contact angle (WCA) about 153.5 and a sliding angle (SA) about 10, and good hydrophobicity to other common household liquids. In addition, the Cu-fabric maintained chemical stability after 72 h under different extreme conditions, and mechanical durability after 200 cm of abrasion length. Furthermore, the separation efficiency of light oil/water mixtures with Cu-fabric exceeded 97% for n-dodecane, n-hexane, kerosene, cyclohexane and n-heptane and Cu-fabric maintained a high separation efficiency for n-dodecane and n-hexane after 30 separation cycles. The as-prepared Cu-fabric exhibited potential for practical application in oil/water separation of oil-contaminated industrial sewage in complicated environments.
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Journal of Cleaner Production
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2021
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IF 9.297
Huanting Hu,Kangkang Miao,Xiaolin Luo,Sifan Guo,Xueqin Yuan,Fei Pei,Huaming Qian,Guodong Feng
Effective treatment for industrial wastewater that contains high concentration of chlorophenols is urgent and indispensable for environmental governance and human health due to their nonbiodegradable, carcinogenic and cytotoxic properties. Four kinds of Cu-containing mesoporous silica materials were utilized to catalyse Fenton-like treatment of high-concentration chlorophenols wastewater (1.0 g L −1 ). All of chlorophenols in various water matrices could be oxidatively decomposed in 35 min with the catalysis of Cu-doped SBA-15. Cu-doped SBA-15 with a Cu/Si molar ratio of 0.133 had the best catalytic activity in the oxidative degradation of 4-chlorophenol with an apparent reaction rate constant of 0.170 min −1 which was 1.3–3.6 times higher than those with other Cu-containing catalysts. After 300 min reaction, total organic carbon content of 4-chlorophenol solution declined continuously to 23.8% with an advisable utilization efficiency of H 2 O 2 of 26.5%–68.4%. Electron spin resonance tests and quenching experiments demonstrated that Cu-doped SBA-15 had a selective catalytic activity in the decomposition of H 2 O 2 into hydroxyl radicals which dominated the degradation of chlorophenols in wastewater. The redox of Cu(II)/Cu(I) in Cu-doped SBA-15 occurred efficiently, which could be attributed to chemical adsorption and electron transformation of organic molecular fragments onto Lewis acidic sites formed by the incorporation of Cu 2+ ions in SBA-15. The biological toxicity of the treated 4-CP wastewater declined significantly in comparison with that of the original wastewater. Our work provided an effective way of the heterogeneous treatment of high-concentration chlorophenol wastewater.
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MATERIALS LETTERS
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2021
·
IF 3.423
Zelong Wang,Dajun Hou,Jungang Yi,Ning Cai,Jia Guo
The application of polymer for thermal interface materials is limited by its low thermal conductivity. In this work, barium titanate coated Cu core–shell particles were prepared and then employed as thermal conductive fillers to reinforce epoxy matrix. The results indicate that thermal conductivity of the Cu@BaTiO 3 /epoxy composites reaches 1.09 W m -1 K −1 at 10 vol% loading, achieving 580% elevation on neat epoxy matrix. Meanwhile, the composites retain high electrical insulation (7.90 × 10 13 Ω·cm) due to the existence of insulative BaTiO 3 layer on Cu surface. This study will provide a novel insight of the design of functionalized core–shell thermal conductive fillers and construction of high-performance thermal interface materials.
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JOURNAL OF SOLID STATE CHEMISTRY
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2021
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IF 3.498
Juncheng Zhou,Yuhao Chen,Shuang Xian,Yicun Liang,Guojia Huang,Lian Wang,Xiaozhan Yang
A novel europium metal-organic frameworks (Eu-MOFs), based on 1,3,5-benzotricarboxylic acid (H 3 BTC), 4,4′-azopyridine (4,4′-AZ) and N , N -dimethyllformamide (DMF), was synthesized by the solvothermal method . The crystal structure, thermal stability, morphology and luminescent properties are characterized by the X-ray diffraction (XRD), thermogravimetry (TG), scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS) and optical spectroscopic techniques. The Eu-MOFs display a unique luminescence quenching effect to nitrobenzene (NB) and copper (Cu 2+ ) ions. The turn-off luminescence can be induced by 210 ppm NB or by 1000 μM Cu 2+ ions. Furthermore, the high sensitivities ( K SV = 0.039 ppm −1 for NB, and K SV =0.029 μM −1 for Cu 2+ ) and low detection limits (0.656 ppm for NB, and 1.395 μM for Cu 2+ ) are obtained. The sensing mechanisms are reasonably explained based on the electron and energy transfer. The experimental results show that the Eu-MOFs can be used as a potential sensing luminescence quenching probes for NB and Cu 2+ ions.
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