JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2020
·Vol. 326
·期 1
·185-192
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IF 1.137
Hu Ke,Liu Zhirong,Xiu Taoyuan,Zhou Limin,Wang Yun
The Cu 3 (BTC) 2 (BTC = 1,3,5-benzenetricarboxylic acid) was synthesized by water/solvent heat method. The Cu 3 (BTC) 2 was characterized by SEM/EDS, Zeta potential and XRD. Batch static adsorption experiments investigated the various factors affecting the adsorption of Th(IV) in aqueous solution such as pH, solid–liquid ratio, contact time, initial concentration and temperature, and the adsorption mechanism is also discussed. The adsorption process was in line with the pseudo-second-order kinetic model and the Langmuir isotherm model. At the same time, compared with other adsorbents. The results showed that Cu 3 (BTC) 2 had good adsorption for Th(IV) with a maximum adsorption of 757.58 mg g −1 .
研究领域:
环境科学
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材料科学
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DOI
高影响因子
Journal of Materials Chemistry C
·
2021
·Vol. 9
·期 27
·8537-8544
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IF 7.393
Zhongyuan Guan,Haihang Ye,Peiwen Lv,Lijin Wang,Jing Zhang,Bin Zou,Aiwei Tang
Multinary Cu-based chalcogenide nanocrystals (NCs) are excellent candidates for optoelectronic applications, but their growth mechanism and its impacts on the NCs’ optical properties remain controversial. Herein, we employed a simple colloidal chemistry method for the growth of multinary Cu-based NCs including ternary Cu–In–S NCs, quaternary Cu–In–Se–S NCs, and five-component Cu–In–Zn–Se–S NCs, to explore their growth mechanism and investigate their optical properties. It is found that the ternary Cu–In–S NCs contain a large number of copper vacancies, which affect the major acceptor level for the exciton recombination. With the high reaction activity of Se, the quaternary Cu–In–Se–S NCs form at low reaction temperature and have a red-shift of the photoluminescence (PL) maximum due to the recombination from the conduction band to the acceptor level. The formation process of five-component Cu–In–Zn–Se–S NCs highly depends on the Zn amount, which shows a competitive relationship between the NCs’ growth and diffusion of Zn, leading to the red- and blue-shift of PL maximum, respectively. Our study provides a clear map for the growth of multinary Cu-based NCs and shows their impacts on optical properties.
研究领域:
材料科学
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光学
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DOI
高影响因子
Advanced Science
·
2024
·
IF 14.3
Jin Li,Qiuling Jiang,Xiujing Xing,Cuilian Sun,Ying Wang,Zhijian Wu,Wei Xiong,Hao Li
Electrochemical conversion of nitrate (NO 3 − ) to ammonia (NH 3 ) is a potential way to produce green NH 3 and remediate the nitrogen cycle. In this paper, an efficient catalyst of spherical CuO made by stacking small particles with oxygen-rich vacancies is reported. The NH 3 yield and Faraday efficiency are 15.53 mg h −1 mg cat −1 and 90.69%, respectively, in a neutral electrolyte at a voltage of -0.80 V (vs. reversible hydrogen electrode). The high activity of the electrodes results from changes in the phase and structure during electrochemical reduction. Structurally, there is a shift from a spherical structure with dense accumulation of small particles to a layered network structure with uniform distribution of small particles stacked on top of each other, thus exposing more active sites. Furthermore, in terms of phase, the electrode transitions from CuO to Cu/Cu(OH) 2 . Density functional theory calculations showed that Cu(OH) 2 formation enhances NO 3 - adsorption. Meanwhile, the Cu(OH) 2 can inhibit the competing hydrogen evolution reaction, while the formation of Cu (111) crystal surfaces facilitates the hydrogenation reaction. The synergistic effect between the two promotes the NO 3 - to NH 3 . Therefore, this study provides a new idea and direction for Cu-based oxides in electrocatalytic NH 3 production.
研究领域:
环境科学
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材料科学
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电化学
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DOI
PubMed
高影响因子
RSC Advances
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2016
·Vol. 6
·期 99
·96997-97003
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IF 3.289
Xiang Ma,Haidi Liu,Weiman Li,Shengpan Peng,Yunfa Chen
A copper-based metal organic framework (MOF-199) with controllable size and shape was synthesized and used to remove gaseous methyl mercaptan (CH3SH). Characterizations of the synthesized MOF-199 samples before and after desulfurization were carried out by X-ray diffraction (XRD), Fourier transform infrared (FTIR), and X-ray photoelectron spectroscopy (XPS) to observe the adsorption mechanism of CH3SH on MOF-199. The adsorption performance of the synthesized MOF-199 materials and commercialized activated carbon (AC) and Cu loaded AC were evaluated by breakthrough experiments. All three synthesized MOF-199 materials show better performance than commercialized AC. The morphology and texture of MOF-199 materials have great influence on the performance of the adsorption process. The MOF-199 material synthesized by a hydrothermal method exhibited the highest sulfur compound capacity among the synthesized MOF-199 materials (74.7 mg of CH3SH/1 g MOF-199). The color change of MOF-199 during the CH3SH capturing process, indicated a strong interaction between the unsaturated copper sites and –SH group which finally formed CuS and gave rise to obvious damage to the MOF structure.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Xiuqin Dong,Jianhang Tian,Junwei Lei,Yifei Chen
Copper as a non-noble metal catalyst has great prospects in the hydrogenation of acetic acid to ethanol. In this paper, Cu-MnO/SBA-15 catalysts with highly catalytic performance and stability were prepared. The mechanism was elucidated by experiments and DFT calculations . The Cu and MnO were coexistent on reduced x Cu y Mn/SBA-15. Appropriate Cu/Mn ratio was beneficial for increasing the Cu surface area and reducing the size of Cu. The rate-controlled step was found and the MnO could effectively lower the difficulty of acetaldehyde formation by dioxyethylidene. DFT calculations indicated that the formation of ethyl acetate at the Cu-MnO interface was largely prevented. The optimal catalytic hydrogenation activity was obtained for 9Cu1Mn/SBA-15, with the conversion of acetic acid and selectivity of ethanol of 99.9% and 90.1%, respectively. The catalytic activity could remain within 72 h which was more stable than the original Cu-based catalyst.
研究领域:
催化化学
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理论化学
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DOI
高影响因子
Catalysts
·
2023
·Vol. 13
·期 4
·673
·
IF 3.9
Jinghu Zhu,Hui Liu,Xueyan Zhou,Zhijun Wang,Liancheng Bing,Dezhi Han,Guangjian Wang,Fang Wang
Cu-based catalysts, modified by gallium addition via the stepwise co-precipitation method, were studied for the liquid phase hydrogenation of hydroxypivalaldehyde (HPA) to neopentyl glycol (NPG). Through physico-chemical techniques, the effects of gallium introduction on the Cu trimetallic catalyst performance and the reaction mechanism of HPA hydrogenation were discussed. The characterization results showed that gallium introduction can influence the dispersion, reduction, and distribution of active Cu species, as well as their reactivity. Herein, the catalyst with 2 wt% gallium addition exhibited excellent catalytic performance with HPA conversion rate and NPG selectivity of 93.5% and 95.5%, at a reaction pressure of 3 MPa, temperature of 110 °C, hydrogen-aldehyde ratio (molar ratio) 10:1, and liquid space-time at a speed of 8.4 h−1. The good performance could be attributed to gallium doping tending to dynamically tune the interaction between the components, increasing Cu dispersion and the distributions of Cu+and Cu0species on the catalyst surfaces.Keywords:HPA hydrogenation;NPG synthesis;Cu-based catalyst;gallium modification;Cu+/Cu0
研究领域:
化学工程
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催化材料
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DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2025
·
IF 3.7
Zhiwei Zhao,Yating Wang,Yuhao Tang,Xiaoqing Wang,Feifei Zhang,Jiangfeng Yang
Unconventional natural gas has become an important supplement to conventional energy sources, and the process of enrichment and purification of methane from low concentration coalbed methane is crucial. To this end, we report a copper-based metal–organic framework (MOF), ZJNU-119Cu, featuring two methane traps constructed with uncoordinated carboxylic acid oxygens and open metal sites. ZJNU-119Cu exhibits a high methane adsorption capacity (58.2 cm 3 ·g –1 ) at 298 K and 0.1 MPa and excellent CH 4 /N 2 separation performance under dynamic conditions. Density-functional theory calculations combined with grand canonical Monte Carlo simulation theory reveal the interaction mechanism for the uncoordinated carboxylic acid oxygen atoms and open metal sites in ZJNU-119Cu with CH 4 . The gas adsorption isotherms, heat of adsorption calculations, and breakthrough separation experiments indicate that this MOF is a very promising adsorbent for CH 4 /N 2 separation.
研究领域:
材料科学
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能源化学
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理论计算
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DOI
高影响因子
ISIJ INTERNATIONAL
·
2018
·Vol. 58
·期 7
·1361-1367
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IF 1.35
Jia-yun Wang,Hong-juan Li,Lei Li,Hua Wang,Yu Wang,Yong Yu
A process of removing iron from copper-based alloy scraps using oxidation slagging method is researched, in which the iron is oxidized to FeO and then reacted with SiO2 forming Fe2SiO4 and enter into the slag phase. The addition of SiO2 could restrict the Fe3O4 generation through the transformation of FeO to 2FeO·SiO2 in a certain O2 pressure, which is favorable to decreasing the melt viscosity and increasing the separation efficiency of Cu and Fe. Under optimized conditions of O2 flow rate of 40 ml/min, temperature of 1673 K, oxygenation time of 8 min, and SiO2 amount of 2.17 mass%, Fe content in the metal phase is decreased to 0.0030 mass% with Cu loss rate being of 1.14%.
研究领域:
冶金工程
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材料科学
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DOI
高影响因子
SURFACE AND INTERFACE ANALYSIS
·
2012
·Vol. 45
·期 3
·698-704
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IF 1.18
Junfei Ou,Weihua Hu,Ying Wang,Fajun Wang,Mingshan Xue,Wen Li
A novel bilayer superhydrophobic film was constructed on Cu substrate by a simple multi-step process. First, (3-mercaptopropyl) trimethoxysilane (MPTMS) molecules were self-assembled onto the pre-etched Cu surface via covalent bonding followed by hydrolysis and condensation, then 1H, 1H, 2H, 2H-perfluorodecyltrichlorosilane (PFDTS) were grafted onto the resultant hydroxyl terminated surface via the Si-O-Si bonding. The so-prepared sample was defined as Cu-MPTMS-PFDTS. The structure and morphology of the samples were characterized by means of contact angle measurement, X-ray photoelectron spectroscopy and scanning electron microscopy. The corrosion behaviors of the films were evaluated by Tafel plot and electrochemical impedance spectroscopy on an electrochemical work station. The results indicated that the bilayer superhydrophobic film possessed better corrosion protection as compared with the control samples. The superiority of the corrosion protection was mainly ascribed to the following two aspects: the superhydrophobicity and polysiloxane micro-structures of the Cu-MPTMS-PFDTS. Copyright © 2012 John Wiley & Sons, Ltd.
研究领域:
材料科学
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腐蚀与防护
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高影响因子
ChemCatChem
·
2016
·Vol. 8
·期 12
·2165-2170
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IF 4.724
Cui Lu,Jianying Wang,Zuofeng Chen
Graphical Cu-based water oxidation catalysts : A self-assembling Cu II –4 Gly complex is reported as a catalyst precursor for water oxidation. Electrolysis with this complex precursor results in in situ formation of a surface-accumulated copper(II) deposit, dominated by an amorphous, phosphate-incorporated CuO/Cu(OH) 2 mixture. An onset overpotential of 380 mV and a current density of 1 mA cm −2 could be achieved at an overpotential of 450 mV with a Tafel slope of 64 mV dec −1 . Although notable progress has been made in developing first-row transition-metals-based water oxidation catalysts, continuous efforts are required to identify more inexpensive, efficient, and robust catalysts. Here, we demonstrate the utility of a series of readily available complexes formed by earth-abundant copper and amino acids as catalyst precursors. In phosphate solution at pH 12, electrolysis with 1 m m Cu II and 4 m m Gly results in in situ formation of an amorphous surface precipitate of a CuO/Cu(OH) 2 mixture, which incorporates a substantial amount of phosphate anions. This surface-bound solid can catalyze water oxidation with an impressive onset overpotential of 380 mV, an overpotential of 450 mV for a current density of 1 mA cm −2 , and a low Tafel slope of 64 mV dec −1 , which make it among the most active Cu-based heterogeneous electrocatalysts. The copper-based reactivity toward water oxidation is shared by Cu II complexation to other amino acids as catalyst precursors.
研究领域:
电化学
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催化科学
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材料科学
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产品关联
DOI
高影响因子
WEAR
·
2023
·
IF 5
Guoqing Wang,Jingfu Song,Gai Zhao,Qingjun Ding,Tianqiang Yin,Hongxing Wang
Tungsten disulfide (WS 2 ) has great potential as solid lubricating coating on the metal surfaces due to its excellent wear resistance. In this study, a combination of experiments and machine learning (ML) was used to explore the friction process and predict the friction coefficient and wear rate of WS 2 coatings. Copper coated with WS 2 was prepared by spraying, and the tribological properties of the coating were studied under different loads, velocities, and environment temperatures using both experiments and simulations. Three ML algorithms were employed to investigate the correlations between multiple input parameters and output results. The results showed that the COF and wear rate increased with increasing load, velocity, and environment temperature, and that plastic deformation and adhesive wear were the dominant wear mechanisms under conditions of heavy load, high speed, and high temperature. The Extra Tree (ET) model effectively predicted the tribological properties of the WS 2 coating, with a COF accuracy of 0.899, while the Gradient Boosting Regression Tree (GBRT) model achieved excellent accuracy in predicting wear rate, with an accuracy of 0.948. Feature importance analysis indicated that load had the greatest effect on both COF and wear rate.
研究领域:
材料科学
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机械工程
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数据科学
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DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2021
·Vol. 21
·期 12
·6088-6093
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IF 0
Bai Wenxia,Zhou Jinxuan,Shi Xueting,Wang Haitao,Liu Yanhua,Feng Libang
The widespread application of artificial superhydrophobic material is hindered by the poor durability and regeneration of artificial superhydrophobicity. The problem is expected to be resolved by endowing the superhydrophobic material with self-similarity. Herein, Copper-based superhydrophobic
material intensified by furfuryl alcohol resin (Cu/FAR) with long-term durability and high strength is developed, and the obtained Cu/FAR composite reveals excellent and durable superhydrophobicity. Moreover, it is a remarkable fact that the as-prepared superhydrophobic Cu/FAR exhibits outstanding
durability and maintenance of superhydrophobicity grounded on the good self-similarity in micro-structure, chemical structure and composition both externally and internally. Consequently, the superhydrophobicity can be maintained or regenerated without difficulty even if superhydrophobic surface
has been damaged or fouled accidentally. Therefore, the method provides a new thought to prepare superhydrophobic material with robust durability and outstanding maintenance.
研究领域:
材料科学
·
表面化学
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DOI
危险品化学品经营许可证（带存储）