ENERGY & FUELS
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2022
·
IF 4.654
Bo Zhao,Ruijie Zhu,Nan Sheng,Chunyu Zhu,Zhonghao Rao
The utilization of the paraffin phase change material (PCM) in solar energy storage systems is limited by its low thermal conductivity, easy leakage, and insensitivity to solar energy. In the present study, the solution combustion synthesis method was applied to fabricate a porous carbon matrix that is embedded with Cu nanoparticles (Cu@C). The shape-stabilized composite PCM was prepared by vacuum impregnation of liquified paraffin. The paraffin/Cu@C composite retained a high latent heat storage enthalpy of 148.2 J/g. The thermal conductivity of the composite was increased to 145% compared to that of pure paraffin. Due to the strong capillary absorption feature of the porous matrix, the composite also indicated a good anti-leakage property. Additionally, the Cu@C matrix also endowed the composite PCMs with good photo-thermal transformation capability, implying their potential application in solar thermal energy storage.
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高影响因子
POLYMER BULLETIN
·
2022
·Vol. 80
·期 7
·7927-7947
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IF 2.843
Wang Qian,Zhu Sining,Xi Chen,Zhang Fan
A novel crosslinked hyperbranched polyamide-amines adsorbent (CHAP-SH) with sulfhydryl functional groups was synthesized by modifying thiourea and its selective adsorption properties for Cu (II) were studied. The adsorption of coexisting ions showed that the CHAP-SH had high adsorption capacity and selectivity for Cu (II). The adsorption characteristics and mechanism of the CHAP-SH for Cu (II) were systematically investigated. The results of shake flask adsorption experiments indicated that the adsorption procedure was well adapted to the Langmuir isotherm and pseudo-second-order kinetics models, and the maximum adsorption capacity of Cu (II) was 158.48 mg/g at pH = 5.0 and 45 ℃. The adsorption mechanism of the CHAP-SH for Cu (II) was mainly the synergistic interaction with –NH, –COO − , and –SH functional groups. After seven adsorption/desorption cycles, it could still maintain a high removal rate, which provided great potential for the development of multiple novel and reusable immobilized functional materials to efficiently isolate the Cu (II) ions.
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高影响因子
RENEWABLE ENERGY
·
2022
·
IF 8.634
Yunlong Yao,Zhiquan Yu,Chenyang Lu,Fanfei Sun,Yao Wang,Zhichao Sun,Yingya Liu,Anjie Wang
Copper catalysts showed excellent C O hydrogenation selectivity, but poor ability of hydrogen dissociation. Herein, a strategy to improve the activity of a Cu-based catalyst is developed by thermal treatment of Cu(OH) 2 at 100 °C with C 2 H 2 /Ar (0.5 vol%) followed by H 2 reduction at 300 °C. By means of X-ray diffraction (XRD), transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS) and extended X-ray absorption fine structure (EXAFS), it was revealed that Cu x C crystallites , in addition to Cu crystallites, were present in the prepared catalysts. In furfural hydrogenation at 60 °C and 1.0 MPa, the Cu x C-containing catalyst showed significantly higher activity than the Cu counterpart prepared from the same precursor by H 2 reduction at 300 °C. The introduction of ZnO improved the dispersion, and thus led to enhanced catalytic performance. The Cu x C-Cu-ZnO catalyst with Zn/Cu molar ratio of 0.5 showed considerably high hydrothermal stability in a 70-h run, with furfural conversion of >99.0% and the furfuryl alcohol selectivity of 100%.
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高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Jingjing Tan,Jing He,Kuan Gao,Shanhui Zhu,Jinglei Cui,Long Huang,Yulei Zhu,Yongxiang Zhao
The hydrogenation of furfural to furfuryl alcohol in liquid was performed over Cu/CeO 2 catalyst with different morphology that was nanorod (CeO 2 -R), nanocube (CeO 2 -C) and nanopolyhedron (CeO 2 -P), respectively. It was observed that the Cu/CeO 2 -R catalyst exposed (1 1 0) crystal plane owns more oxygen vacancies and metal sites of Cu 0 in comparison with the catalyst of Cu/CeO 2 -P and Cu/CeO 2 -C. Meanwhile, it exhibited superior catalytic performance for furfural hydrogenation to furfuryl alcohol with a high yield of 98 % at 100 °C, 2 MPa H 2 within 4 h. The structure–activity relationship demonstrated that the catalyst intrinsic activity (TOF) is positively related to the concentration of oxygen vacancies and the metal sites of Cu 0 on its surface. DFT calculations and in-situ FTIR confirmed that Cu/CeO 2 -R (1 1 0) catalyst with more oxygen vacancy is in favor of the adsorption and activation of furfural (C O) on the catalyst surface compared with Cu/CeO 2 -P (1 1 1) and Cu/CeO 2 -C (1 0 0). Accordingly, the remarkable efficiency of Cu/CeO 2 -R catalyst can be assigned to the synergistic catalysis between the surface Cu 0 and the oxygen vacancies. Cu 0 was used to adsorb and activate H 2 , whereas the oxygen vacancies facilitate the adsorption of C O by O on the surface of the catalyst.
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高影响因子
Green Processing and Synthesis
·
2022
·Vol. 11
·期 1
·445-457
·
IF 3.97
Ziqian Wu,Zhihuan Fu,Yunbo Tian,Murtaza Hasan,Liting Huang,Yuanting Yang,Cuijing Li,Ayesha Zafar,Xugang Shu
The emergence of drug-resistant bacteria and the lack of effective antimicrobial agents have posed a threat to public safety, so a new efficient strategy is needed to deal with the increasing severity of bacteria. Herein, a substitute antibacterial agent with high stability and biocompatibility was synthesized by incorporating lysine hydrochloride and copper sulfate pentahydrate following the liquid-phase synthesis method. The composition and structure of the Cu( ii ) complex (Lys–Cu) were characterized by performing ultraviolet-visible spectrophotometry, Fourier-transform infrared spectroscopy, X-ray diffractometry (XRD), thermogravimetric analysis-differential scanning calorimetry, and single-crystal XRD. The crystal structure of Lys–Cu belongs to a monoclinic system, space group P 2 1 , with cell parameters of a = 5.14350(10), b = 16.8308(2), c = 11.4915(2) Å, Z = 2, and D = 1.548 g·cm −3 . Bacteriostatic tests were carried out on Escherichia coli and Staphylococcus aureus . The minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) values of Lys–Cu against S. aureus were 0.3125 and 0.9250 mg·mL −1 , respectively. The MIC and MBC values of Lys–Cu against bacterial strain E. coli were 0.4685 and 0.9250 mg·mL −1 , respectively.
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高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Lei Chen,Wenting Sun,Zhiying Xu,Minghui Hao,Baojing Li,Xin Liu,Jingjing Ma,Liang Wang,Chunhu Li,Wentai Wang
Low-temperature electrocatalytic reduction of nitric oxide (NORR) is promising for the low-cost, high-efficiency removal and utilization of nitric oxide (NO), which couples the two crucial industrial processes of denitration and synthetic ammonia. We reported a binary catalyst of Cu/P–TiO 2 for NORR process, which took advantages of the Cu electrocatalysts and porous TiO 2 . The increase of surface areas and channels can improve the adsorption of NO molecules. The decoration of the ultrafine Cu nanoparticles on the porous TiO 2 may prevent the agglomeration of ultrafine Cu nanoparticles. The as-prepared Cu/P–TiO 2 electrode exhibits excellent electrocatalytic activity with a Faraday efficiency of 86.49% and NH 3 yield of 3520.80 μg·h −1 ·mg −1 in 0.1 M K 2 SO 4 at −0.3 V vs. RHE. The mechanism of the NORR reaction process with Cu/P–TiO2 catalysts was also discussed. This research may broaden the application areas of TiO 2 -based materials in the electrocatalysis and provide a new sight in the treatment of NO pollutants.
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Sustainable Energy & Fuels
·
2022
·Vol. 6
·期 10
·2449-2461
·
IF 6.813
Hongxing Wang,Yueqing Wang,Long Huang,Anying Geng,Fengjiao Yi,Yulei Zhu,Yongwang Li
Highly efficient synthesis of 1,4-pentanediol (1,4-PDO) from industrialized biomass-based products is still a challenge due to the inherent chemical stability of intermediate product γ-valerolactone. The aim of the present research was to evaluate the influence of the synthetic conditions of CuMgAl layered double hydroxides on their physicochemical properties as well as catalytic performance in pure ethyl levulinate hydrogenation to produce 1,4-PDO in fixed-bed reactors. Systematic characterization results demonstrated that the CuMgAl catalyst prepared with mixed alkali as the precipitant has appropriate amounts of acid-base sites and a higher electron cloud density of Cu, which could well activate the carbonyl functional groups in the substrate molecule, and thus excellent reaction performance can be obtained. Ultimately, two-stage-packed dual solid catalysts in fixed-bed reactors were designed for one-step conversion of industrial furfuryl alcohol (FOL) to 1,4-PDO through an alcoholysis hydrogenation integrated continuous process. 94.3% yield of 1,4-PDO can be obtained from FOL in this effective tandem reaction.
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高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 9
·1429
·
IF 5.719
Shuo Liu,Peng Zhang,Yuming Miao,Chenmin Li,Yu-e Shi,Jinhua Liu,Yun-kai Lv,Zhenguang Wang
Selective and sensitive identification of paraoxon residue in agricultural products is greatly significant for food safety but remains a challenging task. Herein, a detection platform was developed by integrating Cu nanoclusters (Cu NCs) with MnO2nanosheets, where the fluorescence of Cu NCs was effectively quenched. Upon introducing butyrylcholinesterase and butyrylcholine into the system, their hydrolysate, thiocholine, leads to the decomposition of the platform through a reaction between the MnO2nanosheets and thiol groups on thiocholine. The electron-rich groups on thiocholine can further promote the fluorescence intensity of Cu NCs through host–guest interactions. Adding paraoxon results in the failure of fluorescence recovery and further promotion, which could be utilized for the quantitative detection of paraoxon, and a limit of detection as low as 0.22 ng/mL can be achieved. The detection platform shows strong tolerance to common interference species, which endows its applications for the detection of paraoxon in vegetables and fruit. These presented results not only open a new door for the functionalization of metal nanoclusters but also offer an inspiring strategy for analytic techniques in nanomedicine and environmental science.Keywords:organophosphorus pesticides;fluorometry assay;metal nanoclusters;MnO2nanosheets;fluorescence quenching
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PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Wen-Jian Yang,Li-Hui Yang,Han-Jun Peng,Si-Hao Lv,Hafiz Muhammad Adeel Sharif,Wei Sun,Wei Li,Cao Yang,Hui Lin
Electroreduction removal of nitrate (NO 3 – -N) is considered as a promising approach to solve its adverse effects on environment and human health, where efficient and cheap catalysts are required. Perovskite-based catalysts showed a versatile catalytic ability for wide range of redox reactions, but seldom applied for NO 3 – -N reduction. Herein, four perovskite oxide cathodes, LaMO 3-δ (M = Fe, Co, Ni and Cu) were prepared and used for the reduction of NO 3 – -N. The Ruddlesden-Popper (RP) type La 2 CuO 4 exhibited the best NO 3 – -N catalytic activity among the four perovskite oxide cathodes, with a removal rate of 11.7 × 10 -3 min −1 . The high selectivity of NH 4 + -N (82.4 ± 2.2%) indicated that NH 4 + -N was the main final product for NO 3 – -N electroreduction at La 2 CuO 4 cathode, but 100% of N 2 selectivity could be obtained with addition of 1000 and 1500 mg/L Cl - as the electro-assisted chlorination process. The mechanism of NO 3 – -N electroreduction occurred by both electron- and H*-mediated pathway, and the oxygen vacancies and redox cycle of Cu(I)-Cu(II)-Cu(I) were proposed as the accommodation sties and direct electron sources for NO 3 – -N reduction. Generally, this study opens a novel avenue for the development of earth-abundant, cost-effective catalyst with effective NO 3 – -N electroreduction.
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高影响因子
JOURNAL OF APPLIED PHYSICS
·
2022
·Vol. 131
·期 14
·
IF 2.877
Chen Guifeng,Du Qinghua,Zhang Hui,Niu Ruotong,Yuan Wenhao,Xie Xinjian,Guo Tianyu,Liu Guodong
Quantum dots of I–III–VI ternary compounds exhibit unusual photophysical properties and technological utility, which attract attention and have been intensely investigated. CuInSe 2 quantum dots are an environmentally friendly composition, a direct transition, and an adjustable bandgap. Here, we discuss the influence of the Cu/In molar ratio of CuInSe 2 quantum dots on Cu-related defects and photo-physical properties, and CuInSe 2 quantum dots are synthesized by a green, safe, and low-temperature method in triethylene glycol. The proportion of the +1 and +2 oxidation states of Cu in the quantum dots will change with the Cu/In molar atomic ratio. The +1-oxidation state of Cu will prolong the carrier recombination lifetime and provide favorable conditions for the transfer and collection of carriers. By adjusting for different defect types, we can better apply CISe quantum dots in devices and other fields.
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高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2022
·
IF 3.428
Mengjie Lu,Siyu Liu,Jinyan Xiong,Wei Li
Photocatalytically splitting water to hydrogen production is a great potential for addressing the issue of energy crisis and environmental pollution. Metal-semiconductor hybrid photocatalyst has attracted increasing attention, and especially non-noble metal decoration is one of promising strategies to promote photoinduced electron-hole pairs separation for an efficient solar-to-hydrogen evolution. Herein, a facile solvothermal approach was successfully employed to prepare calcium titanate (CaTiO 3 ) nanorods with decoration of copper particles. The composition and morphology characterization showed that the Cu particle was deposited on the surface of CaTiO 3 nanorod. The as-synthesized CaTiO 3 /Cu composites exhibited promoted solar-to-hydrogen performance and their activities varied from copper loading amounts. The optimized CaTiO 3 /Cu-0.05 achieved a hydrogen evolution rate of 251 µmol g −1 h −1 , which was much higher than that of bare CaTiO 3 . Based on the photoluminescence spectra and photocurrent density measurements, it was proposed that efficient separation of photogenerated charges was achieved between the CaTiO 3 nanorod and Cu nanoparticles, which promoted water splitting for H 2 production. This work further confirms that metallic Cu decoration is an efficient approach to promote photocatalytic H 2 production performance of semiconductor photocatalysts.
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高影响因子
JOURNAL OF RARE EARTHS
·
2022
·
IF 4.632
Zhichao Shang,Yong Yu,Hang Yang,Zhongxiang Yang,Yang Xiao,Xiaohong Wang
The Cu/CeO 2 nanoporous composite material was prepared via a one-step and energy-saving method of solution combustion synthesis (SCS). The phase composition , surface morphology and optical characteristics of Cu/CeO 2 were studied. The results show that the SCS products are composed of cubic fluorite CeO 2 and Cu. Due to the generation and escape of gas during the synthetic reaction, the SCS CeO 2 shows porous structure, in which the mesopores (diameter 10–17 nm) nest in the wall of large pores (diameter 80–300 nm). X-ray photoelectron spectroscopy (XPS) outcomes indicate that the oxygen vacancy concentration of CeO 2 increases (18.97%–30.93%) with the increase of Cu concentration. The decoration of Cu greatly enhances the catalytic activity of CeO 2 nanomaterials . 30 wt% Cu/CeO 2 composite material shows the best photocatalytic activities for the degradation of methyl orange (MO) (95.99%), which is about 4.3 times that of CeO 2 at the same time (120 min). UV-vis diffuse reflectance spectroscopy (DRS) results show that the semiconductor band gap is reduced with the addition of metallic Cu, which leads to the enhancement of photocatalytic activity. The free radical trapping experiments demonstrate that ·O 2 – and h + are the main active species in the photocatalytic degradation of MO. Based on the above results, a hypothesized mechanism for enhanced photocatalysis of Cu/CeO 2 nanomaterials was proposed: the porous structure provides more reactive sites and channels for mass transfer, and the presence of metallic Cu improves the oxygen vacancy concentration of CeO 2 and then promotes charge-carrier separation, which helps enhance the photocatalytic performance of Cu/CeO 2 .
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