SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Zhen Huang,Ziyang Chu,Haibo Liu,Tianhu Chen,Xuehua Zou,Fuwei Sun,Dong Chen
Effective removal of heavy metal complexes from contaminated water remains a challenging task. In this work, a limestone/PMS system was constructed for the efficient degradation of Cu-EDTA. Under the conditions of 3.0 g/L limestone and 1.0 mM PMS, the degradation efficiency of 10.0 mg/L Cu-EDTA reached 99.0 % in 60 min, and the removal efficiency of Cu ions approached 50.0 %. The main active specie revealed by quenching and EPR experiments was the singlet oxygen ( 1 O 2 ). Interestingly, Trace amounts of Cu(II) in limestone react with PMS enhancing the degradation of Cu-EDTA. The results of the HPLC-MS analysis showed that the reactive species attacked the Cu–O and Cu–N bonds, as well as triggered a decarboxylation process, resulting in the decomposition of Cu-EDTA into six intermediates. Meanwhile, SEM and XPS analyses revealed that Cu ions released during the degradation of Cu-EDTA are deposited on the limestone surface as Cu(OH) 2 and Cu 2 (OH) 2 CO 3 . In addition, the initial pH and co-existing ions have a weak effect on the system. Finally, a one-month continuous flow experiment showed that the degradation efficiency of Cu-EDTA was about 95.0 % and the removal efficiency of Cu ions was 40.0 %. In conclusion, this study provides a new approach for the destruction of metal complexes and the removal of heavy metals.
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高影响因子
CATALYSIS TODAY
·
2024
·
IF 5.2
Mingze Xu,Guangjie Wang,Haiyu Li,Tingsong Zhang,Jinhua Li,Yu Wang,Yue Peng,Wenzhe Si
The issue of water pollution has emerged as a formidable challenge, prompting a pressing need for solutions. The utilization of metal nanoparticles with surface plasmon resonance and semiconductor composite photocatalysts is regarded as a highly effective approach to solve this problem. g C 3 N 4 is an effective catalyst for the degradation of organic pollutants. Its photocatalytic performance could be enhanced by the use of the metal such as Au, Ag, and Cu. However, the Schottky barrier is generally believed to be the reason that Cu can enhances the photocatalytic performance of g C 3 N 4 . In fact, the plasmonic of Cu will also have an effect on the photocatalytic effect of g C 3 N 4 , like Au and Ag. In this study, it is first proposed that the photocatalytic performance of g C 3 N 4 can be enhanced by combining the plasmonic of Cu and the Schottky barrier. Cu g/C 3 N 4 nanocomposites with stable crystal structure, with Cu as the core and g C 3 N 4 as surface coating, were synthesized and characterized by transmission electron microscopy (TEM), X ray diffractometer (XRD) and ultraviolet visible spectroscopy (UV Vis) and X ray photoelectron spectroscopy (XPS). Then, it is optimized that the Cu/g C 3 N 4 composite material which were prepared with 200 nm Cu particles, GSH as the ligand bridge, and a Cu: g C 3 N 4 ratio of 5:1, have the best photocatalytic property, which is 16.7 times of the photocatalytic property of g C 3 N 4 . Besides, the transfer efficiency of hot electrons of 33% (from Cu to g C 3 N 4 ) under the influence of the Schottky barrier (0.58 eV) is calculated theoretically. On this basis, the mechanism of Cu nanoparticles enhancing the photocatalytic performance of g C 3 N 4 was also been proved through the calculation result and transient photocurrent spectroscopy (TPC), electrochemical impedance spectroscopy (EIS), and steady state transient fluorescence spectroscopy (PL) characterization. The excellent photocatalytic performance of the Cu/g C 3 N 4 composites is due to the simultaneous influence of Schottky barrier and LSPR of Cu.
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高影响因子
Environmental Science-Water Research & Technology
·
2024
·Vol. 10
·期 8
·1785-1794
·
IF 3.5
Jun Zhang,Shenjun Wang,Yuhao Wu,Jiahai Ma
In advanced oxidation systems, the promoting effect of bicarbonate is relatively overlooked. Bicarbonate, as an inorganic anion widely present in natural waters, is extremely important for water treatment. Therefore, bicarbonate was added to a PDS/Cu2+ system to investigate the degradation mechanisms of organic contaminants. The generation of alkyl radicals in the PDS/Cu2+/HCO3− system was first demonstrated through Electron Paramagnetic Resonance (EPR) testing. This study reveals that the introduced bicarbonate ions undergo transformation into alkyl radicals. The presence of alkyl radicals promotes the cycling of monovalent, divalent, and trivalent copper ions, facilitating the degradation of contaminants. The production of monovalent and trivalent copper ions in the reaction system was confirmed through UV-vis absorption spectroscopy and quenching experiments. Furthermore, the change in the oxidation state of copper ions was further confirmed through EPR testing. These findings not only shed new light on the degradation mechanism of the PDS/Cu2+ system in the presence of bicarbonate but also open up new avenues for the further application of bicarbonate in advanced oxidation processes.
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SOLAR ENERGY
·
2021
·
IF 5.742
Ting Wang,Jiayong Zhang,Bin Yao,Yongfeng Li,Zhanhui Ding,Chunkai Wang,Jia Liu
Five types of Cu 2 ZnSn(S,Se) 4 (CZTSSe) films were fabricated by selenization of Cu 2 ZnSnS 4 (CZTS) precursor films preparing through Cu-Zn-Sn-S precursor solutions with nominal Cu + /(Cu + +Cu 2+ ) ratio of 0, 0.2, 0.4, 0.8 and 1. Five types of CZTSSe solar cells were prepared by using the five types of CZTSSe films as absorbers, respectively. The crystal quality and phase composition of the CZTS and CZTSSe films were characterized by XRD, Raman and SEM, and the photovoltaic performance for the CZTSSe solar cells were measured by J-V and EQE. It is found that the CZTS film consists of kesterite CZTS when the ratio is 0 and of kesterite CZTS together with a small amount of SnS when the ratio is 0.2 to 1. All of the CZTSSe films are comprised of kesterite CZTSSe and a small amount of Zn(S,Se). The crystal quality and lattice constants of the kesterite CZTSSe increase with increasing the ratio, while the amount of Zn(S,Se) decreases with increasing the ratio and almost to zero as the ratio is 1. The power conversion efficiency ( PCE ) of the CZTSSe solar cells increases from 5.47% to 8.43% as the ratio increases from 0 to 1, which is due to improvement in short-circuit current density ( J sc ) and filling factor ( FF ) and decrease in open circuit voltage deficit ( V oc , def ). The influence mechanism of the ratio on the PCE is suggested by analyzing effect of the ratio on electrical parameters of the CZTSSe solar cells.
研究领域:
光伏技术
·
材料科学
·
半导体薄膜
·
太阳能电池技术
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高影响因子
Catalysis Science & Technology
·
2019
·Vol. 10
·期 5
·1431-1443
·
IF 5.726
Zhaohui Teng,Shan Huang,Liang Fu,Heng Xu,Na Li,Qulan Zhou
In our research, rice husk ash (RHA) was employed as a catalyst support and Fe–Cu bimetallic compounds were employed as catalysts in the reduction of NO by CO. Rice husk ash contains abundant amorphous SiO2 and it would be a good catalyst support as indicated by the characterization results. Different combustion conditions were tested to obtain the appropriate rice husk ash. Characterization methods were employed to study its physical properties. The results of the catalytic activity testing experiment were highly in accordance with the characterization results. Fe2Cu1 based on rice husk ash had approximately 100% conversion rates for both NO and CO, which indicated the superiority of the rice husk ash and Fe–Cu oxides. Moreover, the O2 content, CO/NO ratio and SO2 had little influence on this new combination. This remarkable performance was due to the strong interaction between the rice husk ash and metal species. The results of our research will provide some instructions for the improvement of industrial denitrification.
研究领域:
环境科学
·
催化化学
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Jiamei Ma,Wei Zhong,Langlang You,Yi Pei,Chunxin Lu,Zhiyin Xiao,Zhongquan Shen,Xiujuan Jiang,Nianlong Qian,Xiaoming Liu,Shuhua Zhang
In this work, three materials of Cu-Cu 2 O/rGO-NH 2 -4.4/1, -1/1 and -1/10.4, in which the numeric suffices denote the ratio of Cu/Cu 2 O in the materials, were described and characterized using various analytical techniques including FTIR, XRD, SEM, HRTEM, XPS and Raman spectroscopy. To probe the band structures of these materials, UPS, cyclic voltammetry, and UV–vis reflection spectroscopy were also employed. The formation of heterojunctions in the ternary materials tune their band structures by raising the energy level of valence band maximums (VBMs), inducing an internal electric field (IEF) and an electron accumulation layer (EAL) within the materials. Augment of copper content in the materials can enhance the energy level rising. The coordination of N-methylimidazole (NMI) with Cu 2 O of the materials can also contribute to raising the energy level. The changes in these electronic properties bring about a synergistic effect in selective aerobic oxidation of benzylic alcohols via improving O 2 activation and facilitation of electron transfer between the catalyst and the reactants due to the rising of the energy level of VBM and the formation of IEF.
研究领域:
材料科学
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催化
·
电化学
·
表面科学
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高影响因子
Science Advances
·
2026
·Vol. 12
·期 13
·
IF 13.9
Yu Zhang,Ningqiang Zhang,Yiwei Liu,Haofan Lei,Tao Zhou,Wenlong Wu,Wei-Wei Wang,Han Yan,Chao Ma,Ken-ichi Shimizu,Chun-Jiang Jia,Jie Zeng
For oxide-supported metal catalysts, metal-support interaction (MSI) facilitates metal dispersion at the expense of the metallic character, resulting in a trade-off between active site utilization and intrinsic activity. Here, we used a thermal aging strategy to modulate the MSI in Cu/CeO 2 catalysts, facilitating the formation of metallic Cu sites upon H 2 reduction while maintaining metal dispersion. Systematic experiments confirmed that thermal aging at 800°C lowered the reduction temperature and increased the reduction degree of Cu sites. Microscopy evidenced few-atom-layered Cu nanoclusters before and after H 2 reduction, whereas in situ spectroscopy revealed metallic Cu nanoparticles under H 2 atmosphere. This discrepancy indicated a reversible structural evolution from aggregation to redispersion in thermally aged Cu/CeO 2 . The catalytic activity for acetylene semihydrogenation was unlocked on metallic Cu sites, compared to nearly inactive Cu sites in conventional Cu/CeO 2 counterparts. Our work developed an effective strategy for rational modulation of MSI, offering the feasibility to tailor-make active sites for specific reactions.
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高影响因子
ACS Nanoscience Au
·
2026
·
IF 7.5
Guangtao Wang,Simin Li,Chao Yu,Yang Zhou,Wenlei Zhu,Bo Shen
Abstract Facet engineering of Cu-based nanocatalysts is a promising strategy for regulating the selectivity of CO2 and CO electroreduction because surface atomic arrangements strongly influence intermediate adsorption and reaction pathways. Compared with low-index facets, high-index facets contain abundant steps, kinks, and low-coordinated atoms, providing diverse active ensembles that can facilitate CO adsorption and subsequent C–C coupling. However, the catalytic roles of high-index-faceted Cu nanocatalysts remain largely unexplored. Herein, tetrahexahedral (THH) and hexoctahedral (HOH) high-index-faceted Cu nanoparticles were integrated with a porous Ag foam to construct Cu/Ag tandem catalysts for CO2 electroreduction. The C2+ selectivity follows the order HOH Cu/Ag > THH Cu/Ag > non-facet-controlled Cu/Ag, with HOH Cu/Ag achieving the highest ethylene Faradaic efficiency of 60.37%. In situ spectroscopic measurements using HOH Cu/Ag as a representative high-index-faceted catalyst indicate the formation of abundant adsorbed CO and possible CO-derived coupling intermediates within the potential range associated with pronounced ethylene production. Stability measurements further show that the morphology and catalytic selectivity are largely retained under moderate operating conditions, whereas more negative potentials induce surface roughening and gradual performance decay. This work provides a platform for investigating morphology-dependent selectivity in high-index-faceted Cu catalysts during CO2 electroreduction.
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Nanomaterials
·
2020
·Vol. 10
·期 11
·2170
·
IF 4.324
Jialing Chen,Gang Peng,Tingyu Liang,Wenbo Zhang,Wei Zheng,Haoran Zhao,Li Guo,Xiaoqin Wu
The NH3-SCR activities and hydrothermal stabilities of fivexCu/MCM-22 zeolites with different Cu loadings (x= 2–10 wt%) prepared by incipient wetness impregnation method were systematically investigated. The physicochemical properties ofxCu/MCM-22 zeolites were analyzed by XRD, nitrogen physisorption, ICP-AES, SEM, NH3-TPD, UV-vis, H2-TPR and XPS experiments. The Cu species existing inxCu/MCM-22 are mainly isolated Cu2+, CuOxand unreducible copper species. The concentrations of both isolated Cu2+and CuOxspecies inxCu/MCM-22 increase with Cu contents, but the increment of CuOxspecies is more distinct, especially in high Cu loadings (>4 wt%). NH3-SCR experimental results demonstrated that the activity ofxCu/MCM-22 is sensitive to Cu content at low Cu loadings (≤4 wt%). When the Cu loading exceeds 4 wt%, the NH3-SCR activity ofxCu/MCM-22 is irrelevant to Cu content due to the severe pore blockage effects caused by aggregated CuOxspecies. Among the fivexCu/MCM-22 zeolites, 4Cu/MCM-22 with moderate Cu content has the best NH3-SCR performance, which displays higher than 80% NOxconversions in a wide temperature window (160–430 °C). Furthermore, the hydrothermal aging experiments (xCu/MCM-22 was treated at 750 °C for 10 h under 10% water vapor atmosphere) illustrated that all thexCu/MCM-22 zeolites exhibit high hydrothermal stability in NH3-SCR reactions.Keywords:Cu/MCM-22;NH3-SCR;Cu loading;hydrothermal aging
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PubMed
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 98
·95740-95746
·
IF 3.289
Lili Bie,Xue Luo,Qingqing He,Daiping He,Yan Liu,Ping Jiang
Hierarchical Cu/Cu(OH)2 nanorod arrays grown on commercially available Cu foam (Cu/Cu(OH)2 NRA/CF) was prepared via a three-step strategy involving the wet chemical synthesis of Cu(OH)2 NRA/CF, a chemical reduction reaction for conversion from Cu(OH)2 NRA/CF to Cu NRA/CF, and finally galvanostatic anodization to grow Cu(OH)2 nanoparticles on Cu NRA/CF. Hierarchical Cu/Cu(OH)2 NRA/CF shows high catalytic activity towards glucose oxidation in an alkaline solution and can serve as a promising electrode material for enzyme-free glucose sensing. At an applied potential of +0.5 V, the sensor showed a broad detection range of 0.001–1.0 mM, a high sensitivity of 9.18 mA mM−1 cm−2, and a low detection limit of 0.45 μM (S/N = 3). Furthermore, the sensor exhibits excellent selectivity against common interferents and good reliability for glucose detection in human serum samples.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Guihong Han,Yifan Du,Yanfang Huang,Shuzhen Yang,Wenjuan Wang,Shengpeng Su,Bingbing Liu
Benzohydroxamic acid (BHA) is intensively used as collector in the mineral processing industry, and thus tremendous hazardous beneficiation wastewater containing BHA organic contaminant needs urgent treatment. In this work, an efficient removal of BHA organic contaminants from various industrial beneficiation wastewaters via the chelation, flocculation, and precipitation flotation process was studied. The removal efficiency of BHA, COD and turbidity of the purified water, and the chelation mechanism were investigated by optical microscope, SEM, FTIR, XPS, Zeta potential, and thermodynamic analyses. The results showed that organic BHA contaminant can be chelated firstly by Cu(II) to form hydrophobic BHA-Cu precipitate effectively via the “O-O” chelation and a five-membered chelation ring was formed under weak alkaline conditions. The generated precipitate was then successfully removed using CTAB as surfactant and NP-40 as frother in a microbubble flotation column. Over 94% BHA was removed under the optimal chelation, flocculation and flotation conditions: chelation with Cu(II) concentration of 30 mg/L and pH of 8 for 30 min; flocculation with CTAB concentration of 0.2 mg/L for 20 min; followed by flotation with NP-40 frother of 0.6 mg /L and air flow rate of 100 mL/min for over 40 min. Under this condition, 83.91% COD was removed, and the residuel COD and turbidity of the purified water were lower than 25 mg/L and 0.1 NTU, respectively, which met the wastewater discharge requirement. It’s demonstrated that the precipitate flotation can be employed as an effective method to purify industrial wastewater containing BHA. In addition, the interaction mechanism of Cu(II) and BHA under different pH values was also discussed in this work.
研究领域:
环境科学
·
化学工程
·
矿物加工工程
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高影响因子
APPLIED SURFACE SCIENCE
·
2026
·
IF 6.6
Shuo Han,Xu-bin Wang,Qian-cheng Sun,Wen-feng Yang,Fei Xiao
Simple immersion surface Pd alloying modification yields high-strength Cu-Cu bonding. • Disorder-to-order transformation offers extra driving force unlike inert Pd layer. • Lattice distortion & atomic pinning give 160 MPa shear strength at 76% bonding ratio. • Glycerol reduces oxide to nanocrystals and prevents oxidation during bonding in air. Low-temperature Cu-Cu thermal-compression bonding is essential for three-dimensional integrated circuits (3D ICs) to achieve high-density vertical interconnects. The key scientific challenge lies in achieving sufficient atomic interdiffusion at temperatures below 250 °C, where volume diffusion is sluggish and native oxides impede metal‑to‑metal contact. Here, this challenge is overcome by a simple galvanic displacement reaction that forms a disordered Cu-Pd surface alloy, followed by glycerol‑assisted bonding. This surface engineering simultaneously reduces roughness, raises surface energy, refines grains, and introduces micro-strain, while glycerol removes residual oxides in-situ and protects the interface from re-oxidation. These modifications accelerate atomic diffusion, and the exothermic defect annihilation and disorder-to-order transformation further lowers the diffusion barrier. Consequently, Pd‑displaced samples exhibit high shear strength and bonding ratio, and Kirkendall voids shrink under bonding conditions, potentially mitigating electrical concerns. The measured strength exceeds predictions from the bonding area alone due to solid‑solution hardening and lattice distortion. This work provides a simple, selective, and industrially viable route for low‑temperature Cu-Cu and hybrid bonding, offering a new surface‑alloying strategy with potential applicability to advanced packaging. Simple immersion surface alloying with glycerol reduction and protection achieves high‑strength Cu‑Cu bonding in air via abundant grain boundaries, disorder‑to‑order transformation and lattice distortion (exceeding estimated bulk Cu shear strength), while Kirkendall voids shrink with bonding durations to reduce potential electrical concerns. Download: Download high-res image (408KB) Download: Download full-size image
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