NEW JOURNAL OF CHEMISTRY
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2022
·Vol. 47
·期 6
·3140-3150
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IF 3.925
Xingrui Qi,Zhidong Zhao,Nian Li,Zijian He,Yufang Chen,Tao Jin
At present, water resources contaminated by pathogenic microorganisms have an increasingly serious impact on human health. Photocatalytic sterilization using solar energy is an inexpensive and effective method. However, how to effectively utilize solar energy and improve the photocatalytic performance of catalysts is the main problem at present. In this work, urchin-like WO3−x and Cu-doped WO3−x were synthesized by a simple method. The synthesized photocatalysts were characterized in detail, and the sterilization performance of the catalysts was investigated under simulated sunlight. The sterilization rates of WO3−x against Escherichia coli and Staphylococcus aureus were 65.74% and 94.73%, respectively, while the sterilization rates of WO3−x doped with Cu against these two bacteria were 99.95% and 99.24%, respectively. Cu–WO3−x shows excellent photocatalytic bactericidal performance, which is attributed to the enhanced oxygen vacancies of WO3−x and the separation of photogenerated electron–hole pairs by the doping of Cu. This work is expected to provide an effective way to develop solar photocatalytic sterilization.
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JOURNAL OF HAZARDOUS MATERIALS
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2023
·
IF 13.6
Qianqian Zhou,Peidong Hong,Xu Shi,Yulian Li,Ke Yao,Wanqi Zhang,Chengming Wang,Junyong He,Kaisheng Zhang,Lingtao Kong
In order to solve the problem of easy aggregation of copper oxides in environmental remediation, it is an effective method to confine copper oxides to suitable substrates. Herein, we design a novel Cu 2 O/Cu@MXene composite with a nanoconfinement structure, and it can effectively activate peroxymonosulfate (PMS) to produce . OH for degradation tetracycline (TC). Results indicated that the MXene with extraordinary multilayer structure and surface negativity could fix the Cu 2 O/Cu nanoparticles in the layer spaces and suppress the agglomeration of nanoparticles. The removal efficiency of TC reached 99.14 % within 30 min, and the pseudo-first-order reaction kinetic constant was 0.1505 min −1 , which was 3.2 times that of Cu 2 O/Cu alone. The outstanding catalytic performance attributed that the MXene based on Cu 2 O/Cu@MXene could promote the adsorption of TC and electron transmittal between Cu 2 O/Cu nanoparticles. Furthermore, the degradation efficiency of TC was still over 82 % after five cycles. In addition, based on the degradation intermediates provided by LC-MS, two specific degradation pathways were proposed. This study provides a new reference for suppressing the agglomeration of nanoparticles, and broadens the application of MXene materials in the field of environmental remediation.
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SOLID STATE SCIENCES
·
2023
·
IF 3.5
Tao Li,Chen Wu,Na Pan,Qianying Hua,Aokui Sun
Molybdenum-copper composites have attracted increasing attention due to their excellent properties in terms of electrical conductivity , thermal conductivity and mechanical property, which are closely related to the density and composition of the sintered material. However, high temperatures are required to obtain high sintering density, resulting in loss of copper in most cases. In this work, a novel core-shell Mo–Cu composite powder was prepared by a ball-milling method followed by hydrogen reduction. The phase compositions and microstructure of prepared powders were studied by XRD , TEM and EDS , and the formation process of core-shell structure of Mo–Cu powders was discussed in detail. It was shown that the significant difference in reduction temperatures between molybdenum and copper oxides contributes to the formation of core-shell structure.
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MRS Communications
·
2023
·Vol. 13
·期 4
·538-545
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IF 1.9
Yin Jinkun,Chu Yaoqing,Tan Lianjiang
Cu/N co-doped TiO 2 nanopowder was prepared with a facile sol–gel method. In the absence of stabilizing agents, the co-doped nanopowder with nanoscaled particle sizes was obtained. Doping didn’t change the anatase crystal structure of TiO 2 . Cuprite Cu 2 Cl(OH) 3 formed in the co-doped nanopowder. Based on ultraviolet–visible (UV–vis) spectroscopy and X-ray photoelectron spectroscopy (XPS) data, the mechanisms of significantly improved photocatalytic activity of the co-doped nanopowder were discussed. The antibacterial evaluation and cytotoxicity test suggested the nanopowder inhibited bacteria significantly under visible light and had ultralow cytotoxicity. This work provided a promising antibacterial agent with potential biomedical applications.
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Catalysts
·
2023
·Vol. 13
·期 7
·1038
·
IF 3.9
Jincheng Wu,Guoguo Liu,Qin Liu,Yajing Zhang,Fu Ding,Kangjun Wang
The hydrogenation of methyl formate to methanol is considered one of the most effective methods for recycling methyl formate products. We recently developed a highly efficient and cost-effective Cu-SiO2catalyst using the ammonia-evaporation (AE) method. The Cu-SiO2-AE catalyst demonstrated superior performance, achieving a methyl formate conversion of 94.2% and a methanol selectivity of 99.9% in the liquid product. The catalyst also displayed excellent stability over a durability test of 250 h. Compared to the commonly used Cu-Cr catalyst in the industry, the Cu-SiO2-AE catalyst exhibited higher conversion of methyl formate and methanol yield under the same reaction conditions. Characterization results revealed a significant presence of Si-OH groups in the Cu-SiO2-AE catalyst. These groups enhanced the hydrogen spillover effect and improved hydrogenation efficiency by preventing sintering during the reaction to stabilize the Cu species. The strategy employed in this study is applicable to the rational design of highly efficient catalysts for industrial applications.Keywords:Cu-SiO2catalyst;hydrogenation of methyl formate;methanol;catalyst stability
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MICROCHIMICA ACTA
·
2023
·Vol. 191
·期 1
·1-11
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IF 5.7
Shi Fengna,Hu Sheng,Li Jingfang,Wang Fang,Chen Naipin
A novel, green, and facile approach has been developed to construct an ultrasensitive flexible enzyme-less electrochemical sensor on the basis of chitosan and graphene oxide composites decorated with Cu nanoparticles supported on nickel foam (Nif/Cs/GO@Cu), in which GO functions as the intermediate between Nif and Cu nanoparticles. The Nif/Cs/GO@Cu sensing platform was successfully fabricated by the drop casting method to load Cs/GO onto Nif followed by an additionally electrodeposition to support Cu nanoparticles on Nif/Cs/GO. Impressively, the Nif/Cs/GO@Cu exhibited much higher electrocatalytic activity for glucose and UA oxidation as compared to that of Nif or Nif@Cu. For glucose and UA at about 0.6 V and 0.1 V (vs. Ag/AgCl), linearity could be obtained in the concentration ranges 5 µM–4 mM and 5–345 µM; the sensitivities were 16 and 2.5 µA µM −1 cm −2 , and the detection limits 83 nM and 0.3 µM, respectively. The improved performance of the composite electrode was ascribed to the synergistic effect of Cu nanoparticles, Nif and GO, in which GO provides high electron conductivity and large surface area to prevent the agglomeration of Cu nanoparticles; Cu nanoparticles and Nif offer abundant active sites towards analytes oxidation. Additionally, the method was applied to determine both analytes successfully in blood serum samples with excellent recovery and also opens up an attractive route to potential applications of the flexible nickel foam-based electrochemical sensor. Graphical Abstract
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Yange Suo,Yuxin Guo,Chenbin Rong,Zhiguo Zhang,Guilin Hu
This work reports the synthesis of a series of carbon supported Pt-Pd-Cu (Pt-Pd-Cu/C) nano-catalysts for formic acid oxidation. The trimetallic catalysts were prepared by a one-pot protocol through reduction of Pt, Pd and Cu ions using ethylene glycol and sodium citrate as the reducing and stabilizing reagents. XRD characterization suggests that Pt-Pd-Cu alloys with different lattice parameters can be successfully prepared through adjusting the atomic ratios of Pt, Pd and Cu ions in the precursor solutions. The average crystal sizes of the Pt-Pd-Cu/C catalysts are in the range of 2.7-3.1 nm. TEM images shows that the metallic nanoparticles are well dispersed on the carbon surface, with Pt 1 Pd 3 Cu 3 /C catalyst showing obvious aggregation. XPS was carried out to analyze the surface compositions, as well as the chemical states of the novel metals in the catalysts. The real atomic ratios of the metals in the catalysts based on ICP-OES evaluation are consistent with the stoichiometric values. Electrochemical analysis suggests that the activities the Pt-Pd-Cu/C catalysts towards formic acid oxidation are dependent on the composition of the catalysts, with Pt 1 Pd 4 Cu 2 /C exhibiting the best performance. A mass normalized peak current density of 3.02 A/mg (Pt+Pd) was observed on Pt 1 Pd 4 Cu 2 /C catalyst.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2023
·Vol. 34
·期 19
·1-13
·
IF 2.8
Hu Lifang,Yang Kun,Liu Xijing,Zhu Jichao,He Jie,Chen Xiaoyang
Semiconductor photocatalysis is a green and environmentally friendly antibiotic wastewater treatment technology without secondary pollution. In this paper, a series of montmorillonite (MMT) samples loaded with Cu, Mn, and Ni were prepared by impregnation method. The structure and spectral response of the as-prepared samples were characterized by powder X-ray diffraction, energy-dispersive spectroscopy, laser Raman spectroscopy, X-ray photoelectron spectroscopy, ultraviolet photoelectron spectroscopy, UV–Vis diffuse reflectance spectroscopy (UV–Vis DRS), electrochemical impedance spectroscopy, and photocurrent response test. The photocatalytic degradation of tetracycline hydrochloride (TCH) was carried out under simulated solar irradiation, and the photocatalytic properties of MMT samples with different loads were investigated. The characterization results show that Cu and Mn have strong interaction with MMT, and composite photocatalyst Cu 10 Mn 10 -MMT has the smallest Nyquist arc and higher photocurrent intensity. Degradation experiments on TCH showed that Cu 10 Mn 10 -MMT had the best photocatalytic degradation, with a degradation rate of 79.78%, three times that of the original MMT. Active substances capture experiments showed that h + and O 2 . − were the main active substances for the degradation of TCH by Cu 10 Mn 10 -MMT. After the combination of Cu, Mn, and MMT, the band structure changed, resulting in more h + and O 2 .− involved in the redox reaction, thereby improving the photocatalytic degradation performance of TCH. In this work, a promising photocatalyst is used to efficiently and greenly degrade antibiotic wastewater.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2022
·
IF 24.319
Honglin Li,Shoufu Cao,Hongman Sun,Yonglian Lu,Ying Zhang,Xiaoqing Lu,Jingbin Zeng,Zifeng Yan
Copper (Cu) has been proved as an efficient catalyst in carbon dioxide electrochemical reduction reaction (CO 2 RR) towards hydrocarbons, but still suffers from low selectivity and poor stability. Herein, Cu-based/CxNy catalysts were fabricated by facile pyrolysis of CuNCN in sealed quartz tubes. It is found that CuNCN pyrolyzed at 300 °C (CuNCN-300) exhibits a high C 2 H 4 Faradaic efficiency of 48.5% at 500 mA cm - 2 . However, increasing the pyrolysis temperature above 400 °C gives rise to CH 4 being the predominant product and CuNCN-500 achieves CH 4 Faradaic efficiencies of 66.3% at 300 mA cm - 2 . Combining experimental and DFT calculation results, Cu 3 N plays a crucial role in the formation of C 2 H 4 , while tri-s-triazine units in CuNCN-500 reduce the barrier of *CO hydrogenation to *CHO and retard C-C coupling on Cu surface. These findings mark the significance of precise tailoring of the synergistic effect between g-C 3 N 4 and different Cu species for achieving the desired selectivity during CO 2 RR.
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INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2022
·Vol. 46
·期 14
·19814-19825
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IF 4.672
Yanbing Liu,Zongyuan Zhu,Jinwen Shi,Shiyu Zhao,Fei Liu,Hui Jin
Summary A cheap biochar-based metal catalyst, Cu/C was prepared by employing a facile pyrolysis method and using the waste biomass resource of rice straw as C source, and was used in the transesterification reaction of soybean oil to prepare biodiesel. With the addition of copper nitrate and with a pyrolysis temperature of 400°C for the biomass precursor, the as-synthesized Cu/C-400 catalyst with a loading amount of 6 wt% in the reaction dispersion results in a biodiesel yield of 88.5% ± 1.8%. The Cu/C-400 catalyst still maintains a high activity with a biodiesel yield of 79.4% ± 1.2% after four cycles. The economic analysis about Cu/C-400 catalyzed production of 1 t biodiesel is carried out by using the life cycle cost (LCC) method, indicating that the cost of 1 t soybean biodiesel is about 7727.8 RMB. In particular, the catalyst cost is only 5.6% of the total cost, indicating the low cost of the synthesized catalyst. Finally, the sensitivity analysis reveals that an appropriate increase in catalyst loading amount can improve the biodiesel yield, but lead to an increase in the total cost of biodiesel, and therefore reasonable control of catalyst loading amount is necessary. This work will inspire the further development and application of biochar-based metal catalyst in biodiesel production.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Xinyu Zhou,Huiran Jin,Shan Yun,Wanxia Huang,Pin Mao,Jing Chen,Yi Yang
The effective capture and storage of the generated radioactive contaminant (iodine) are of great significance with the extensive use of nuclear energy. In this work, a novel Cu nanoporous aerogel (Cu-NPA) was prepared by using inorganic Cu salt as precursors. The as-prepared Cu-NPA was fully characterized in detail, and the I 2 adsorption and stability capability of Cu-NPA has been investigated in the solution. The results showed that Cu-NPA has high specific surface area and porosity. The structure of hierarchical pores is conducive to the rapid enrichment of pollutants in water. Adsorption experiments showed that Cu-NPA had ultra-high I 2 adsorption capacity (1384 mg/g) and fast equilibrium adsorption time (10 min). The I 2 in the solution (c < 1200 mg/g) can be almost completely removed. In addition, Cu-NPA exhibits good stability in the air and can be exposed to air for a long time. In general, our work demonstrated the preparation of Cu-NPA and its great potential in the field of rapidly eliminating radioactive I 2 .
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APPLIED CATALYSIS A-GENERAL
·
2022
·
IF 5.723
Yue Li,Huan Ren,Daolai Sun,Xinqiang Zhao,Satoshi Sato
Liquid-phase catalytic hydrodeoxygenation of 1,2-decanediol (1,2-DDO) to form 1-decanol was performed over various non-noble metal-loaded acidic catalysts, and Cu loaded on amorphous SiO 2 -Al 2 O 3 exhibited a high catalytic activity for the formation of 1-decanol. A high 1-decanol selectivity of 84.7% with a complete 1,2-DDO conversion was obtained within only 15 min over the Cu/SiO 2 -Al 2 O 3 at 250 °C under 10 MPa H 2 pressure. The temperature at 250 °C and the H 2 pressure higher than 3 MPa were conducive to the efficient production of 1-decanol from 1,2-DDO. In contrast to the previously reported noble metal catalysts, Cu/SiO 2 -Al 2 O 3 required a relatively high reaction temperature, while an extremely high 1-decanol productivity of 78 mmol g cat −1 h −1 could be achieved. Meanwhile, the hydrodeoxygenation of 1,2-decanediol over Cu/SiO 2 -Al 2 O 3 proceeded via a reaction mechanism in which decanal was formed as the intermediate. In addition, the Cu/SiO 2 -Al 2 O 3 catalyst was reusable at least five times without serious deactivation.
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