Catalysts
·
2023
·Vol. 13
·期 9
·1246
·
IF 3.9
Jianhui Zhao,Huan Li,Yuanzhou Wang,Jingjie Yu,Ning Li,Shaopo Wang
Biochar (BC) usually has abundant surface functional groups, well-developed pore structures and high specific surface areas, which can combine with transition metals for peroxymonosulfate (PMS) activation to degrade organics. In this paper, BC modified with Cu/CuO was prepared by a modified impregnation pyrolysis method using peanut shells as raw materials. The morphology, structure and physicochemical properties were analyzed. Results showed that the originally smooth BC surface was modified into a rough structure with distributed metal particles, and the specific surface area of the modified Cu/CuO-BC700 (i.e., Cu/CuO-BC) increased from the initial 22.57 to 192.64 m2/g. The Cu/CuO-BC was employed for PMS activation and tetracycline (TC) degradation, achieving a removal efficiency of 93.2% at TC initial concentration 20 mg/L, PMS concentration 0.5 mM and catalyst dosage 0.1 g/L after 30 min. The influence of co-existing anions in the actual water on TC degradation followed the order of HCO3−> H2PO4−> Cl−, and HA had an inhibitory effect on TC degradation. A variety of active species participated in TC degradation, and the free radical pathway played a dominant role. Furthermore, the Cu/CuO-BC could maintain the degradation efficiency of TC up to 80% even after five consecutive cycles. The Cu/CuO-BC maintained high activity through redox reactions between catalytically generated active species and the cycling of metal ions (Cu+/Cu2+).Keywords:Cu/CuO;modified biochar;peroxymonosulfate;active species;tetracycline
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Qingdi Kong,Xiaojie Zhang,Kangrui Ma,Yuefa Gong,Hong Peng,Wei Qi
It is a challenging task to remove heavy metal ions efficiently from the wastewater containing high concentrations of complexants. In this work, a novel PEI-modified chitosan/activated carbon composite adsorbent (PCA) was prepared and applied to the removal of Cu(II) from pyrophosphate plating rinsing wastewater. The main species of Cu(II) in the pyrophosphate wastewater was [Cu(HP 2 O 7 ) 2 ] 4− or [Cu(P 2 O 7 ) 2 ] 6− , which were denoted as [Cu(II)-PP] anions. The maximum adsorption capacity of PCA for Cu(II) reached 1.41 mmol g −1 under the condition of pH = 8 and molar ratio of pyrophosphate to Cu(II) = 4:1. The adsorption kinetic behavior of Cu(II) on PCA followed the Elovich model best and PCA attained adsorption equilibrium within 36 h. The thermodynamic studies showed that the adsorption process of Cu(II) by PCA was endothermic and spontaneous. The PCA fixed bed column was used to remove Cu(II) from simulated pyrophosphate plating rinsing wastewater. After three consecutive adsorption-desorption cycles, the adsorption performance, hydraulic conductivity , and mechanical stability of PCA column did not decrease. The FTIR and XPS analysis results indicated that [Cu(II)-PP] anions can be adsorbed on PCA by electrostatic attraction with protonated amine groups or coordination with the amine groups of PCA via ligand substitution.
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DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 33
·11441-11450
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IF 4
Defeng Hu,Zhongqiao Sun,Yide Han,Hao Meng,Xia Zhang
Considering the surface affinity of MOFs and separation advantages of polymer membranes, herein, a one-step interface synthesis strategy is used in the construction of Cu-BTC/PVDF hybrid membranes, in which Cu2+ ions and 1,3,5-benzenetricarboxylic acid (H3BTC) were dissolved in ionized water and n-octanol separately, and polyvinylidene fluoride (PVDF) films were laid at the interface of two immiscible solvents. As a result, Cu-BTC was generated and readily self-assembled inside the PVDF films. Scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, thermogravimetric analysis (TGA) and the Brunauer–Emmett–Teller (BET) method were used to characterize Cu-BTC/PVDF hybrid membranes, and Congo red (CR) was selected as the target dye to evaluate the surface adsorption activity of the hybrid membranes. Batch adsorption tests under various conditions were conducted to optimize the adsorption capacity, adsorption kinetics, isotherms and thermodynamics, which were analyzed to further explore the adsorption behavior. Based on this, the adsorption mechanism was discussed. It is worth noting that because of the π–π stacking interaction and hydrogen bonding, an extraordinary adsorption capacity of CR was achieved, and the good separation advantage and the cyclic adsorption performances endow the resulting Cu-BTC/PVDF hybrid membranes with promising applications in the removal of organic dyes from practical wastewater.
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GREEN CHEMISTRY
·
2023
·Vol. 26
·期 2
·968-978
·
IF 9.8
Xinwei Wen,Yue Zhao,Puyang Fan,Jiajie Wu,Kai Xiong,Chang Liu,Qing Qu,Lei Li
The production of ammonia under ambient conditions has been a long-standing challenge for the chemical industry. The electroreduction of nitrate presents a promising solution for nitrate wastewater treatment and decentralized ammonia production. However, traditional Ag-based catalysts suffer from nitrate-to-nitrite conversion, leading to toxicity concerns and hampering ammonia preparation. In this study, we synthesized an innovative Ag–Cu–P catalyst that effectively tunes the d-band centre and electronic structure. The catalyst exhibited a remarkable NH4+ yield rate of 566.30 μmol cm−2 h−1 at −0.3 V (vs. RHE), reducing nitrite content to below the drinking water standard. Characterization results revealed a distinctive fern leaf-like morphology, providing an expanded active surface area. The challenge of facile nitrate conversion to nitrite on Ag-based catalysts has been addressed through the implementation of electronic structure modulation in this work. Theoretical calculations confirmed the substantial reduction in the energy barrier by modulating the d-band centre and electronic structure, facilitating the conversion of nitrite to ammonia. The regulation and analysis of d-band centres yielded valuable insights for catalyst material design. Meanwhile, direct evidence for potential intermediates has also been presented through in situ spectroscopy. These findings hold significant potential for practical applications, such as enhanced wastewater treatment and decentralized ammonia production, and provide support in the pressing need for sustainable ammonia synthesis under ambient conditions.
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TRIBOLOGY INTERNATIONAL
·
2023
·
IF 6.2
Hongming Wei,Gangwen Feng,Xiaoya Li,Wenyi Zhan,Feiyang Li,Yanzhang Dai,Jianpeng Zou
Cu/graphite composites are widely used in various fields as friction materials . However, their tribological properties are limited by the inadequate wettability between Cu and graphite and the insufficient strength of the Cu matrix. To strengthen Cu/graphite composites and improve their interface bonding, this investigation employed Cr 2 AlC to modify Cu/graphite composites fabricated by spark plasma sintering (SPS). The microstructure, interface characteristics, and tribological properties of the composites were thoroughly examined. The results show that the composites exhibit favorable tribological properties, which improved with the increase in sintering temperature . Specifically, as the sintering temperature increases from 800 °C to 980 °C, the friction coefficient of the composites decreases from 0.170 to 0.138, while the wear rate decreases from 9.92 × 10 −7 mm 3 /N·m to 1.86 × 10 −7 mm 3 /N·m.
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Advanced Healthcare Materials
·
2023
·Vol. 12
·期 30
·2300746
·
IF 10
Jianwen Zhang,Xinyu Pei,Yihan Liu,Xianlan Ke,Ya Peng,Yajun Weng,Qinyong Zhang,Junying Chen
There is an urgent need to develop a series of multifunctional materials with good biocompatibility, high mechanical strength, hemostatic properties, antiadhesion, and anti-infection for applications in wound care. However, successfully developing multifunctional materials is challenging. In this study, two superhydrophobic composite coatings with good biocompatibility, high mechanical strength, strong antifouling and blood repellency, fast hemostasis, and good antibacterial activity are prepared on cotton fabric surface by simple, green, and low-cost one-step dip-coating technology. The results discussed in the manuscript reveals that the two superhydrophobic composite coatings can maintain good mechanical stability, strong water repellency, and durability under various types of mechanical damage, high-temperature treatment, and long-term strong light irradiation. The coatings also exhibit good repellency to various solid pollutants, highly viscous liquid pollutants, and blood. In vitro and in vivo hemostatic experiments show that both composite coatings have good hemostatic and anticlot adhesion properties. More importantly, this superhydrophobic coating prevents bacterial adhesion and growth and released Cu 2+ and Zn 2+ ions and chitosan to achieve bactericidal properties, thereby protecting injured skin from bacterial infection. The two superhydrophobic coatings enhance the antifouling, antiadhesion, hemostatic, and antibacterial functions of blood-repellent dressings and therefore have broad application prospects in medical and textile fields.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Lei Yang,Tengyang Gao,Saisai Yuan,Ying Dong,Yiming Chen,Xijuan Wang,Chuanxiang Chen,Liang Tang,Teruhisa Ohno
Two-dimensional (2D) beta indium sulfide ( β -In 2 S 3 ) shows great potential in photocatalytic hydrogen production due to its broad-spectrum response, relatively negative conduction band edge, high carrier mobility and low toxicity. However, the high charge recombination rate limits the application of In 2 S 3 . Here, we in-situ grew 2D cadmium sulfide (CdS) on the surface of In 2 S 3 doped with copper ions (Cu 2+ ) to construct a heterojunction photocatalyst that suppresses charge recombination. The in-situ grown method and shared sulfur composition were conducive to forming the efficient interface contact between In 2 S 3 and CdS, promoting charge transfer and showing the high spatial charge separation rate, resulting in a hydrogen production rate of 868 µmol g -1 h −1 . The induced Cu 2+ extended the light absorption range and stabilized the photocatalyst . By creating stable 2D/2D heterojunction photocatalysts with high charge separation efficiency, this work opens new possibilities for applying In 2 S 3 materials in photocatalytic hydrogen production.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Jianxiong Xing,Luo Yan,Tao Chen,Zhicui Song,Zihao Wang,Yuchi Liu,Liujiang Zhou,Jingze Li
Lithium (Li)-rich ternary alloy, comprising a multi-alloy phase as the built-in three-dimensional (3D) framework and a Li metal phase as a reversible Li reservoir, is a promising high-energy–density anode for rechargeable Li metal batteries. The introduction of metal/metalloid components to the alloy can effectively regulate Li deposition and maintain the dimensional integrity of the Li anode. Herein, the lithium–copper–zinc (Li–Cu–Zn) ternary alloy, as a new type of alloy anode, is synthesized via a facile thermal melting method. The fully delithiated 3D scaffold comprised two Cu–Zn alloy phases named CuZn and CuZn 5 . These alloy phases exhibit higher lithiophilicity and structural stability than Li–Zn and Li–Cu alloys. Moreover, the CuZn phase is electrochemically inert, ensuring the geometric stability of the anode, while the CuZn 5 phase can readily undergo alloying reaction with Li to form the LiZn phase, thereby facilitating uniform Li nucleation and deposition. The hybridized multiphase alloy structure and specific energy storage mechanism of the Cu–Zn based alloy scaffold in the ternary alloy anode facilitate dendrite-free Li deposition and prolonged cycle lifetime. The Li metal full battery based on lithium iron phosphate (LiFePO 4 ) cathode exhibits high cycling stability with high-capacity retention of 95.4% after 1000 cycles at 1C.
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APPLIED CATALYSIS A-GENERAL
·
2023
·
IF 5.5
Yaoyu Zhang,Yuxiong Wang,Yue Liu,Yuxing Wang,Ling Zhou,Huimin Xu,Zhongbiao Wu
A series of Cu-based catalysts with different types of supports (TiO 2 , Al 2 O 3 , S-1, HZSM-5 SiO 2 /Al 2 O 3 = 27 and 85) were investigated for selective catalytic combustion of acetonitrile (CH 3 CN). Among all catalysts, the Cu/TiO 2 and Cu/Al 2 O 3 catalysts had superior activity accompanied with the generation of massive NO x , while Cu/ZSM-5 catalysts exhibited excellent N 2 selectivity. The characterization results indicated that the surface acidity of catalysts played a decisive role in reaction behavior. For the Cu/TiO 2 and Cu/Al 2 O 3 catalysts mainly with Lewis acid sites, CH 3 CN underwent an initial hydrolysis step with surface hydroxy group to form acetamide anion (CH 3 CONH ad ), then occurred further hydrolysis reaction to form NH 3 at low temperatures, or turned to proceed oxidation reaction with numerous NO x generation at high temperatures. Whereas, the enriched Brønsted acid sites on the Cu/ZSM-5 catalysts brought abundant isolated Cu 2+ ions, which guaranteed the processing of iSCR reaction, thereby promoting the occurrence of hydrolysis and oxidation reaction pathways in parallel and benefiting the improvement of N 2 selectivity. These results elucidated the influence of supports with different acidic types in reaction pathway and provided precious reference for the development of high-performance NVOCs catalysts.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Hongshuai Cao,Yijing Dang,Zhonghai Zhang,Fengping Chen,Jingyao Liu,Qian Sun,Yangchun Xie,Zhiai Xu,Wen Zhang
The real-time detection of nitric oxide (NO) in living cells is essential to reveal its physiological processes. However, the popular electrochemical detection strategy is limited to the utilization of noble metals. The development of new detection candidates without noble metal species still maintaining excellent catalytic performance has become a big challenge. Herein, we propose a spinel oxide doped with heteroatom-Cu-doped Co3O4 (Cu-Co3O4) for the sensitive and selective detection of NO release from the living cells. The material is strategically designed with Cu occupying the tetrahedral (Td) center of Co3O4 through the formation of a Cu–O bond. The introduced Cu regulates the local coordination environment and optimizes the electronic structure of Co3O4, hybridizing with the N 2p orbital to enhance charge transfer. The CuTd site can well inhibit the current response to nitrite (NO2–), resulting in a high improvement in the electrochemical oxidation of NO. The selectivity of Cu-Co3O4 can be markedly improved by the pore size of the molecular sieve and the negative charge on the surface. The rapid transmission of electrons is due to the fact that Cu-Co3O4 can be uniformly and densely in situ grown on Ti foil. The rationally designed Cu-Co3O4 sensor displays excellent catalytic activity toward NO oxidation with a low limit of detection of 2.0 nM (S/N = 3) and high sensitivity of 1.9 μA nM–1 cm–2 in cell culture medium. The Cu-Co3O4 sensor also shows good biocompatibility to monitor the real-time NO release from living cells (human umbilical vein endothelial cells: HUVECs; macrophage: RAW 264.7 cells). It was found that a remarkable response to NO was obtained in different living cells when stimulated by l-arginine (l-Arg). Moreover, the developed biosensor could be used for real-time monitoring of NO released from macrophages polarized to a M1/M2 phenotype. This cheap and convenient doping strategy shows universality and can be used for sensor design of other Cu-doped transition metal materials. The Cu-Co3O4 sensor presents an excellent example through the design of proper materials to implement unique sensing requirements and sheds light on the promising strategy for electrochemical sensor fabrication.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Wei Zhang,Ping Xiong,Qiao Li,Jiansheng Li,Jinyou Shen,Pengyu Zhu,Xiuyun Sun,Jingyu Lu,Ya Hu
EDTA-complexed heavy metals (EDTA-CHMs), one of the typical contaminants in industrial effluents , present challenges for wastewater purification because of their stability and high solubility over a wide pH range. Selective adsorption of various EDTA-CHMs coexisting in industrial wastewater is crucial for the recovery of heavy metal resources. Hence, investigating the competitive behavior and selective adsorption mechanisms of coexisting EDTA-CHMs during the effluent removal process is worthwhile. In this study, we chose Ferrihydrite (Fh) as the adsorbent and focused on the competitive adsorption behavior of two common EDTA-CHMs (EDTA-Cu(Ⅱ) and EDTA-Cr(Ⅲ)) on the Fh surface, as well as their removal mechanisms. For binary systems (EDTA-Cu(Ⅱ) and EDTA-Cr(Ⅲ)), the maximum adsorption capacity of Fh for EDTA-Cu(Ⅱ) was 17.32 mg/g, but because of the coexisting EDTA-Cu(Ⅱ), adsorption of EDTA-Cr(Ⅲ) by Fh was severely inhibited. In a competition experiment with binary contaminants of different EDTA complexes, Fh consistently exhibited stronger adsorption performance on EDTA-Cu(Ⅱ) when the ratio and addition order of EDTA-Cu(Ⅱ) and EDTA-Cr(Ⅲ) in the coexisting system was changed, and the valence state of the EDTA-CHMs was the key factor. The adsorption mechanism indicated that Fh could directly adsorb EDTA-CHMs through electrostatic interaction and surface complexation. The recycling rate of EDTA-Cu(Ⅱ) was still approximately 70.63% after five cycles of treatment with Na 2 SO 4 solution. This study provides new insights into the adsorption behavior of coexisting EDTA-CHMs on adsorbents and the selective removal of related pollutants.
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NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 26
·12117-12122
·
IF 3.3
Chaoqun Huang,Yinan Li,Fan Cai,Hongbin Zhong,Fengling Zhang,Weimin Zhong,Lin Yao,Jiyi Huang
This research put forward an electrochemical immunoassay based on an atomically Cu dispersed nitrogen-doped carbon (Cu-CN) modified disposable screen-printed carbon electrode (Cu-CN/SPCE) for sensitive screening of carcinoembryonic antigen (CEA) with a split-type strategy. Atomic-level Cu–CN can be obtained after pyrolysis of a metal–organic skeleton encapsulated with copper acetylacetone, which can realize significant electrochemical signal amplification of ascorbic acid. Using alkaline phosphatase (ALP) catalytic chemistry to in situ generate ascorbic acid from a sandwich immunoassay, an exquisite protocol was successfully constructed for the CEA bioassay due to the dependence of differential pulse voltammetry (DPV) peak current signals of the Cu–CN/SPCE on the concentration of ascorbic acid. Under optimal conditions, this electrochemical immunoassay is capable of assaying the CEA biomarker sensitively, from which a linear range of 0.01 to 50 ng mL−1 was derived along with a low limit of detection (LOD) of 2.4 pg mL−1. In addition, this method shows good stability and high specificity in the detection process. Compared with the commercial ELISA detection method, the proposed sensing mode exhibits satisfactory accuracy in actual detection samples. Such enhanced analytical performance through atomic level dispersed metals provides a path for the future development of electrochemical immunoassay in the field of tumor biomarkers.
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