JOURNAL OF HAZARDOUS MATERIALS
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2022
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IF 14.224
Tianyi Wu,Jiajia Hu,Yuqiu Wan,Xiaolei Qu,Shourong Zheng
Bromate is a commonly identified carcinogenic and genotoxic disinfection byproduct in water. In the present work, bimetallic Ru-Cu catalyst supported on carbon nanotube (RuCu/CNT) was prepared and the structural properties of the catalysts were characterized. The results show that the presence of Ru enhances the dispersion and reduction of Cu particles in the RuCu/CNT catalyst in comparison with the monometallic Cu catalyst supported on CNT (Cu/CNT). For electrocatalytic reaction on Cu/CNT, bromate is reduced on metallic Cu surface via a redox process. For Ru/CNT, highly active H* radicals are generated on metallic Ru surface via the Volmer process and are used for bromate reduction. As for the RuCu/CNT, bromate is reduced through two main pathways, including direct redox reaction on metallic Cu and indirect reduction by active H* radicals on Ru surface. Accordingly, RuCu/CNT exhibits the highest catalytic activity , ascribed to the synergistic effect between metallic Ru and Cu. Furthermore, the bimetallic catalyst displays much higher catalytic efficiency as compared with previously reported results. The pH, initial bromate concentration, in-situ electrochemical reduction of the electrodes and working potential have strong impacts on the removal efficiency of bromate on RuCu/CNT.
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CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Jinqi Xie,Meng Han,Xiangliang Zeng,Dasha Mao,Haitong Li,Xiaoliang Zeng,Ruiheng Liu,Linlin Ren,Rong Sun,Jianbin Xu
Flexible thermoelectric (TE) devices have great potential in wearable electronics, but there is great challenge to realize robust TE device with high performance via feasible integration process. Herein, based on precisely printed copper patterns, a flexible p Cu 2 Se- n Ag 2 Se TE device is initially realized by in situ ion exchange reaction. The as-prepared Cu 2 Se and Ag 2 Se films possess typical hierarchical defects including atomic scale vacancies, the nanosheet fragments and microscale porous structure, which could significantly scatter phonons in wide frequency range. Accordingly, ultra-low thermal conductivity (Cu 2 Se: 0.13 W m −1 K −1 ; Ag 2 Se: 0.15 W m −1 K −1 ) and optimal ZTs (Cu 2 Se: 0.5; Ag 2 Se: 0.7) are achieved. Meanwhile, the as-fabricated p Cu 2 Se- n Ag 2 Se TE device exhibits an excellent power density of 13.4 W m −2 at a temperature gradient of 40 K, which is among the highest values of printed in-plane film devices. Furthermore, the good adhesion between TE films and porous PI substrate endowed excellent flexibility and stability of p Cu 2 Se- n Ag 2 Se devices.
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Journal of Physical Chemistry C
·
2021
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IF 4.126
Tianyou Chen,Wei Xiao,Zihao Wang,Pengfei Gan,Changfeng Yi,Zushun Xu
Noncovalent immobilization of discrete molecular species on polymer supports is a unique approach to engineer multifunctional cooperative catalysts. Here we devise a modular strategy for the construction of polymer-supported Cu/2,2,6,6-tetramethyl-1-piperidine-N-oxyl (TEMPO) catalytic systems by using hydrophobic interactions and aromatic stacking interactions. Polymer-supported Cu/TEMPO catalysts prepared by nanoprecipitation exhibit excellent catalytic activities for aerobic oxidation of benzyl alcohol, which can be tailored by the type of aromatic moieties, effective constituent ratios, and polymer compositions. We found that strong aromatic stacking interactions and the use of pyrene-containing polymers are crucial to enhance cooperativity. This modular strategy is promising for the immobilization of multifunctional cooperative catalysts with excellent catalytic activities and has potential for the engineering of other heterogeneous multifunctional catalysts.
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ChemistrySelect
·
2023
·Vol. 8
·期 32
·e202302517
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IF 2.1
Kaiwen Ma,Fangya Li,Xinbin Li,Ting Liu,Ting Wang,Huanlei Wang,Shuai Liu
Graphical In this study, a lithiophilic 3D Cu 3 Sn active sites modified commercial Cu foil as current collector is designed by electroplating and heat process, which could induce a uniform nucleation of Li metal. The obtained Li@Cu 3 Sn anode shows superior interface property and efficient Li metal deposition/stripping process. The development of lithium metal battery is severely restricted by its uncontrolled dendrite growth and volume change. In this work, we designed a controllable lithiophilic Cu 3 Sn modified commercial Cu foil as current collector via simple industrial electroplating and heat treatment. As a Li-reservoir substrate for efficient deposition/stripping of Li metal, the introduction of Cu 3 Sn not only increases multiple active sites for the deposition of Li, but also provides more transfer paths for lithium ions. The Li metal anodes prepared by molten Li on the Cu current collector with dispersed Cu 3 Sn active sites provide a uniform lithiophilic surface, which could effectively promote a uniform Li deposition/stripping and suppress the formation of lithium dendrites. As a result, the assembled symmetric battery is stable at a low over-point position for 1600 h without short circuit at 1 mA cm −2 with 1 mAh cm −2 , the full battery paired with LiFePO 4 still maintains a high-capacity retention rate of 97.1 % and a coulombic efficiency (CE) of 99.5 % after 400 cycles at a current density of 2 C. This work provides a facile and controllable strategy for the design of current collectors with high lithium affinity for stable lithium metal anode applications.
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SURFACE & COATINGS TECHNOLOGY
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2023
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IF 5.4
Jian Zhang,Hongxing Lu,Peng He,Zijie Ren,Guofang Shen,Ruxia Liu,Lei Wang,Guoqiang Luo
This study presents a facile electrodeposition and annealing procedure for the fabrication of Ni-Mo-Cu catalysts for hydrogen evolution reaction . Cu addition augmented the surface area and conductivity, while the synergistic effect of the three elements enhanced the intrinsic catalytic activity. After annealing in a vacuum at 300 °C, a dense Cu-Ni solid solution was formed on the catalyst surface, which improved the distribution of components and led to a significant improvement in corrosion resistance . Compared to the directly deposited Ni-Mo catalyst, the annealed Ni-Mo-Cu catalyst exhibited a reduced overpotential of 143 mV to generate a current density of 10 mA cm −2 in 1 M KOH at 25 °C, and its corrosion current density diminished from 0.21 to 0.035 mA cm −2 in 0.5 M NaCl at 25 °C.
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ENVIRONMENTAL RESEARCH
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2023
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IF 8.3
Jiewen Deng,Jieli Ou,Zhenran Wang,Yongsheng Fu,Yiqing Liu
Since limitedly existing researches suggested Cu(II) had deficiently catalytic ability to PAA, in this work, we tested the oxidation performance of Cu(II)/PAA system on diclofenac (DCF) degradation under neutral conditions. It was found that overwhelming DCF removal could be obtained in Cu(II)/PAA system at pH 7.4 using phosphate buffer solution (PBS) compared to poor loss of DCF without PBS, and the apparent rate constant of DCF removal in PBS/Cu(II)/PAA system was 0.0359 min − 1 , 6.53 times of that in Cu(II)/PAA system. Organic radicals (i.e., CH 3 C(O)O• and CH 3 C(O)OO•) were evidenced as the dominant contributors to DCF destruction in PBS/Cu(II)/PAA system. PBS motivated the reduction of Cu(II) to Cu(I) through chelation effect, and then the activation of PAA by Cu(I) was facilitated. Besides, due to the steric hindrance of Cu(II)-PBS complex (CuHPO 4 ), PAA activation was mediated from non-radical-generating pathway to radical-generating pathway, leading to desirably effective DCF removal by radicals. The transformation of DCF mainly experienced hydroxylation, decarboxylation , formylation and dehydrogenation in PBS/Cu(II)/PAA system. This work proposes the potential of coupling of phosphate and Cu(II) in optimizing PAA activation for organic pollutants elimination .
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JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Ruyue Guo,Jiayuan Chang,Huayi Li,Jie He,Peng Pan,Zhengchun Yang,Jun Wei
A core–shell structure that can achieve effective adsorption of methyl orange (MO) can be prepared by using 26-facet Cu 2 O as a template for producing copper using a reducing agent. However, there are insufficient studies on this topic. Therefore, in this study, Cu 2 O@Cu composites were synthesized using a two-step liquid-phase reduction method. MO was used as a pollutant to test the adsorption properties of the materials. The adsorption experiments showed that the adsorption process followed pseudo-first-order kinetic and Freundlich isotherm. The maximum capacity of the adsorbent was 498 mg/g, and the adsorption occurred via spontaneous and exothermic physical adsorption. By the comparison of adsorbent before and after adsorption, it was found that the content of Cu + decreased and that of CuO increased, indicating that the material was oxidized during the adsorption process. Further, FTIR spectroscopy and zeta potential showed that the adsorption mechanism was the electrostatic attraction between positively charged adsorbent and the sulfonic acid group of the MO. Therefore, the porous core-shell structure and the positively charged adsorbent facilitated the adsorption of anionic dyes. 1 TD can be used as an effective adsorbent for MO.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2021
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IF 19.503
Pengchao Ren,Weifeng Tu,Chanchan Wang,Sifan Cheng,Wenqi Liu,Zhenzhou Zhang,Yun Tian,Yi-Fan Han
This study investigated the Cu-CeO 2 interactions for CO hydrogenation to methanol by applying rate measurements, chemical titration/desorption, together with in-situ/operando spectroscopy techniques under realistic reaction conditions. Ce components were enriched in the surface region of Cu/CeO 2 catalysts while Ce 3+ and Ce 4+ atoms co-existed during CO hydrogenation. The ratio of Ce 3+ to Cu 0 in the surface region of catalysts increased linearly with the Ce content. The turnover rates of CH 3 OH formation increased as a single-valued function of the ratio, irrespective to the individual contact extent between Cu and CeO 2 clusters or Ce content in the Cu/CeO 2 catalysts, indicating that the Cu 0 -Ce 3+ sites pair acts as active sites for CO hydrogenation to methanol over Ce-CeO 2 samples. This study also unraveled that formyl and formate species, as reactive surface intermediates, were co-adsorbed on the Cu 0 -Ce 3+ sites, and their hydrogenation routes occurred concurrently for CH 3 OH formation during CO-H 2 reactions.
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JOURNAL OF PHARMACEUTICAL AND BIOMEDICAL ANALYSIS
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2023
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IF 3.4
Xiaolan Yang,Jitao Li,Qiulan Li,Dezhi Yang,Yaling Yang
The amorphous Cu-containing phosphomolybdate (Cu-PTs) composite with high peroxidase (POD)-like activity at neutral conditions was explored as biosensors for raloxifene (RAF) detection. The strong attraction between negatively charged Cu-PTs and positively charged substrates 3,3′,5,5′-tetramethylbenzidine (TMB), as well as the acceleration of the conversion of active Cu + /Cu 2+ by the Cu/W bimetallic redox couples were demonstrated to play significant roles in POD-like activity in physiological environment. When RAF is presence, it can bind to the surface of Cu-PTs and changes the chemical signal on the material surface, leading to the decreased POD-like activity. Based on this, a colorimetric method was established for the sensitive assay of RAF with a lower limit of detection (LOD) of 0.025 mg/L and good recovery from 90.13% to 108.9%. This work paves a new way to design a POD-like colorimetric protocol for tracing RAF in pharmaceutical products and environmental samples.
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SENSORS AND ACTUATORS B-CHEMICAL
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2023
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IF 8.4
Fengwen Cui,Peilin Wang,Kun Liu,Yuchen Guo,Qiang Ma,Yuquan He
A novel confinement-induced ECL enhancement (CIECL) sensing system has been constructed based on copper clusters (Cu NCs) and nano-vesicles in this work. The CIECL strategy resolved the shortcoming of poor stability and low luminous intensity of Cu NCs. Firstly, nano-vesicles were prepared through liquid-liquid self-assembly with amyl gemini quaternary ammonium salt and anionic surfactant. Subsequently, Cu NCs were confined in the nano-vesicles by electrostatic interaction. Due to the restriction on the intramolecular vibration and rotation of the ligands of Cu NCs, the Cu NC/nano-vesicle-based CIECL system showed the significant luminescence enhancement, good stability and high biocompatibility. Additionally, the Au nanoparticles-array with significant surface plasmon resonance effect has been prepared to further amplify the ECL intensity. Finally, the CIECL-based biosensor has been successfully used to detect miRNA-145 in clinic samples in the linear range of 100 fM to 100 nM, which displayed the potential value in the vascular calcification analysis.
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ACS Catalysis
·
2023
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IF 12.9
Zhao Sun,Shufan Yu,Sam Toan,Rufat Abiev,Maohong Fan,Zhiqiang Sun
Steam reforming of methanol is a promising approach to achieving hydrogen storage, transportation, and in situ supply. However, this technology is restricted by its high CO selectivity and catalyst deactivation. In this study, CuCr2O4-based catalytic oxygen carriers are tailored for lattice oxygen participating in low-temperature methanol reforming. We found that the low-temperature activation of methanol originated from Cu–O–Cr structure intensification and highly activated lattice oxygen induction. Specifically, methanol can be activated at temperatures as low as 160 °C, on the one hand, attributed to the reinforcement of the Cu–O–Cr structure and, on the other hand, owing to the highly reactive lattice oxygen from the CuO4 tetrahedron in the CuCr2O4 spinel. Combined with XAS and Raman results, the formation of the Cu–O–Cr structure is demonstrated. The hydrogen production rate with an applied CuCr2O4-based catalytic oxygen carrier is 53.2% higher than the control group without Cu–O–Cr formulation. Satisfactory cyclic stability is retained after the 50th lattice oxygen induction and supplement cycle, ascribing to the Cu–O–Cr structure that strongly intensifies Cu–Cr2O3 interactions. DFT results reveal that the process of CH3OH → CH3O* is the rate-determining step. Compared to Cu(111) and Cr2O3(110), the tailored Cu(111)/Cr2O3(110) surface with a Cu–O–Cr structure exhibits the lowest potential barrier during this process, promoting low-temperature methanol reforming.
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Journal of Environmental Chemical Engineering
·
2023
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IF 7.7
Xuzhao Gao,Yueyang Xu,Yan Yin,Ning Gu,Yongping Zeng
The adsorption desulfurization technology presents remarkable advantages and is a promising method because of its affordability, gentle operating conditions. Metal-organic frameworks (MOFs) have garnered significant attention owing to their remarkable features, including large specific surface areas, pore volume and the designable structure. The hierarchical porous CuBTC-DMA was successfully synthesized by adding salicylic acid and using the hydrothermal method. Subsequently, Ni ions were introduced into the structure using ion-exchange method. It was found that the doping of salicylic acid and Ni ions did not significant alter the structure of the material. The new type of π-complexed adsorbent, Ni@HP-CuBTC-DMA, was prepared. The results of adsorption desulfurization experiments showed that Ni@HP-CuBTC-DMA-1.5(0.2 M) had the highest adsorption capacity, with the maximum adsorption amounts of 25.63 mg S/g and 41.06 mg S/g for thiophene and benzothiophene , respectively. In the toluene competition experiment, the adsorption amount of thiophene could still reach 19.25 mg S/g. The results of regeneration experiments demonstrate that Ni@HP-CuBTC-DMA-1.5(0.2 M) still has excellent adsorption capacity after four cycles.
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