MATERIALS LETTERS
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2023
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IF 3
Zitong Wang,Haotian Wu,Yuan Fang,Hao Yang,Xiaomin Wang
The increasing drug resistance of bacteria due to the inappropriate use of various antibiotics has become an ongoing public health problem around the world. In this work, a novel Cu-hemin nanosheet with multilayer structure was synthesized by a simple green method. Integrating the peroxidase properties of hemin with the excellent photothermal conversion performance of IR780, the as-prepared Cu-hemin@IR780 can not only effectively catalyze hydrogen peroxide to produce reactive oxygen species (ROS), but also has a highly efficient and stable photothermal effect for sterilization. The antibacterial efficiency against MRSA can reach up to 98.96% by using chemodynamic therapy (CDT) and photothermal therapy (PTT) for synergistic sterilization.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2023
·
IF 22.1
Tete Zhao,Xupeng Zong,Jiuding Liu,Jialei Chen,Keqiang Xu,Xiao Wang,Xijie Chen,Wutong Yang,Fangming Liu,Meng Yu,Fangyi Cheng
Copper-based nanomaterials are attractive in CO 2 electroreduction into valuable chemicals but still suffer from limited selectivity of C 2+ products due to the parasitic hydrogen evolution reaction and inefficient dimerization of absorbed CO intermediate (*CO). Herein, we report an in situ polymerization strategy to coat hydrophobic polymer containing methoxyl silane ((CH 3 O) 3 Si–) and trifluoromethyl (–CF 3 ) functional groups on Cu nanoparticles. The optimized Cu-poly exhibits a high Faradaic efficiency of 71.08 % and a remarkable partial current density of 355.4 mA cm −2 for C 2+ products in a membrane electrode assembly electrolyzer using a bicarbonate electrolyte. A combined study of density functional theory calculations and in situ infrared characterizations indicates that the enhanced performances could be ascribed to the decreased formation energy of *COCOH, induced by the withdraw-electron effect of –CF 3 and enhanced coverage of *CO. This work offers a new insight in tuning the electrocatalytic microenvironment through the surface polymerization process.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2021
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IF 5.816
Wen Ren,Xudong Zhuang,Zhilu Liu,Song Li
Metal-organic frameworks (MOFs) are reported as potential hydrogen storage materials due to ultrahigh surface area and pore volume . However, most top-performing MOFs for hydrogen storage require strict synthesis conditions and high cost, which limits their wide applications. In this work, Cu-BTC/graphene aerogel (GA) composite is prepared at room temperature with improved hydrogen uptake at 100 bar compared with pristine Cu-BTC. To understand the mechanism of the enhanced hydrogen uptakes in the composite, grand canonical Monte Carlo (GCMC) simulation is executed for Cu-BTC/GA composites with different numbers of graphene oxide (GO) layers. It is demonstrated that the increased hydrogen uptake in Cu-BTC/GA composites is mainly ascribed to the hydrogen uptake in the interface region between Cu-BTC and GA. Additionally, the hydrogen uptake of the Cu-BTC/GA composites decreases as the number of GO layers increases, implicating that fewer GO layers or thinner GA is favorable for hydrogen adsorption of Cu-BTC/GA composites.
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IRANIAN POLYMER JOURNAL
·
2021
·Vol. 30
·期 7
·685-695
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IF 1.899
Zeng Lelin,Zhou Feixiang,Zhan Xuehui,Zhang Yusheng,Xie Wanyun,Wang Guoxiang,Liang Enxiang
Heavy metal pollution is a serious environmental problem, and adsorption is regarded as an effective technology for metal ions removal. A new absorbent triethylene tetramine (TETA)-modified crosslinked polyacrylonitrile (TETA-modified XL-PAN) was prepared by photo-induced precipitation polymerization of acrylonitrile in water at room temperature using FeC 2 O 4 as photoinitiator and N , N′ -methylenebisacrylamide as crosslinking agent. The TETA provided amidogens, to bond Cu(II) ions and the crosslinking agent was used to improve the stability of adsorbent. FTIR, SEM, BET, and TG were used to characterize the TETA-modified XL-PAN. The FTIR results demonstrate that the XL-PAN was successfully modified by TETA. The SEM images show that TETA-modified XL-PAN powders were agglomerated from 100 to 200 nm spherical particles. TETA-modified XL-PAN was used as an adsorbent to remove Cu(II) ion from wastewater. The effects of contact time, pH, Cu(II) concentration, temperature, and reuse cycles on adsorption were investigated, respectively. Experimental results showed that the adsorption isotherms agreed well with the Langmuir model and a chemical adsorption between TETA-modified XL-PAN and Cu(II) was inferred. After optimizing the experimental conditions, the maximum adsorption capacity of TETA-modified XL-PAN for Cu(II) was 46.6 mg/g with an adsorption time of 8 h. Furthermore, the TETA-modified XL-PAN adsorbent can be well regenerated by acid solutions. After eight regeneration and adsorption processes, the adsorption capacity still reached more than 90% of the first adsorption capacity. These results demonstrated the potential use of TETA-modified XL-PAN as an effective adsorbent for Cu(II) ions removal from wastewater.
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CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Huihui Wu,Jingjing Yan,Xin Xu,Qianhui Yuan,Jinhang Wang,Jun Cui,Aijun Lin
Advanced oxidation processes (AOPs) are promising ways for oxidative degradation of organic pollutants. Atom-dispersed transition metal–nitrogen–carbon (M–N–C) materials exhibit excellent efficiency in activating peroxide bonds and have been extensively pursued for environmental remediation. However, M–N–C with single atoms suffer from intrinsic performance limit of complicated catalytic reactions due to structural simplicity and lack of synergistic active sites. Herein, derived from Fe/Cu–coordinated zeolitic imidazolate frameworks with molecular-scale cages, a well–designed catalyst featuring Fe–Cu dual–metal sites coordinated with N–doped carbon (Fe/Cu–N–C) was fabricated. Compared to the single-atom iron catalyst (Fe–N–C), Fe/Cu–N–C significantly enhanced the chloramphenicol removal rate from 0.073 to 0.093 min −1 due to the synergistic effects of Fe–Cu dual active site. Furthermore, Fe/Cu–N–C exhibits fantastic reactivity for peroxydisulfate (PDS) activation in a wide pH range (3.1 – 10.3). Density functional theory calculations revealed that Fe/Cu–N is the major active site, where electrons transfer from Cu to Fe ensure the low-valence state of Fe for catalytic oxidation. Besides, the optimization of adjacent Cu–N sites improves the bonding orbital distribution of Fe 3d orbitals and promotes the adsorption and cracking of PDS. These findings reveal the cooperative mechanism of Fe–Cu dual–atom site on PDS activation and develop a promising platform toward environmental purification.
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Journal of Environmental Chemical Engineering
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2021
·
IF 5.909
Xia Xu,Ke Jia,Shifei Chen,Daning Lang,Chao Yang,Lu Wang,Ronglan Wu,Wei Wang,Jide Wang
The complex and time-consuming character of the current methods to synthesize cuprous catalysts hampers use of such compounds as replacements for noble metal catalysts for the degradation of organic pollutants . Herein, we report on the development of a simple one-pot method for synthesis of Cu 2 O/Cu nanoparticles . The method was comprised of adding benzyl alcohol during the process of nanoparticle synthesis, where the amount of benzyl alcohol used determined the content of Cu in the obtained nanoparticles . A thorough physicochemical characterization was carried out for the synthesized nanoparticles, where it was found that they could act as catalysts for ultra-fast degradation of phenolics and dyes. Thus, their catalytic activity for the degradation of 4-nitrophenol, methyl orange, and Congo red were evaluated, where pseudo-first-order kinetics were observed. The percentage degradation and rate constant (k app ) values were, respectively, 98% (in 60 s) and k app = 61.23 × 10 −3 s −1 for 4-nitrophenol, 96% (in 100 s) and k app = 31.5 × 10 −3 s −1 for methyl orange, and 97% (in 100 s) and k app = 35.5 × 10 −3 s −1 for Congo red. Comparisons with previously reported cuprous catalysts for degradation of these compounds revealed that the Cu 2 O/Cu nanoparticles of the present paper exhibited the fastest degradation rates.
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CARBOHYDRATE POLYMERS
·
2021
·
IF 9.381
Yongjun Sun,Yuanyuan Yu,Xing Zheng,Aowen Chen,Huaili Zheng
In this study, three magnetic flocculants, namely, MC, MC-g-PAM, and MC-g-PAA, were prepared. The structure characteristics, flocculation performance, and floc characteristics of the three magnetic flocculants were systematically studied and compared. SEM, FT-IR, XPS, XRD, TG–DSC, and VSM characterization results show that MC, MC-g-PAM, and MC-g-PAA are successfully prepared and exhibit good magnetic induction. The removal rates of copper ions by MC, MC-g-PAM, and MC-g-PAA under the optimal coagulation conditions are 93.39 %, 88.64 %, and 61.41 %, respectively. Kinetic fitting shows that the flocculation reaction process of MC and MC-g-PAM conforms to pseudo first-order kinetics, while the flocculation reaction process of MC-g-PAA conforms to pseudo second-order kinetics. The flocs produced by MC-g-PAA have larger particle size and fractal dimension than those by MC and MC-g-PAM. At 80 mg/L dosage and pH 6, the floc size and floc fractal dimension obtained by MC-g-PAA reach the maximum values of 48.28 um and 1.468, respectively. Zeta potential studies show that the flocculation functions of the three flocculants are mainly adsorption bridging, adsorption electric neutralization, and chelating precipitation. Recycling experiments show that MC-g-PAA has good recyclability, and the recovery rate after the fifth use is 77.24 % with the Cu(II) removal rate of 67.53 %.
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PubMed
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INORGANIC CHEMISTRY
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2021
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IF 5.165
Yi-Xin Zhang,Yun-Qiao Tang,Zheng Ma,Ming-Yu Hu,Jing Feng,Zhen-Hua Ge
In this study, Cu2Se1–xSx (x = 0.1, 0.3, and 0.5) alloy powders were prepared by the hydrothermal synthesis method. In the subsequent sintering process, the spontaneous in situ phase separation process of the sample forms a two-phase hybrid structure. The generated Cu2S precipitates in the Cu2Se matrix noticeably enhance phonon scattering, which is beneficial for low thermal conductivity without significantly affecting the electrical transport performance. Ultimately, an optimized thermoelectric performance was obtained in Cu2Se0.9S0.1, reaching a peak zT value of 1.43 at 773 K, the optimum value among the Cu–Se–S systems at this temperature.
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ChemNanoMat
·
2021
·Vol. 7
·期 3
·277-283
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IF 3.154
Jie Wang,Hongqin Ma,Jia Li,Xinyue Luo,Luqi Yu
Graphical Cu(I) decorated 2D black phosphorus nanosheets were synthesized by a ball-milling method . In the process of ball-milling, the bulk black phosphorus was exfoliated into nanosheets under the action of shearing force. Due to the reducibility of black phosphorus, it can react with CuCl 2 to form Cu(I)/BNPSs-n. As the active component of the adsorbent, Cu(I) species can interact with benzothiophene or dibenzothiophene in fuel to achieve the purpose of adsorption desulfurization. In this study, Cu(І) decorated two-dimensional black phosphorus nanosheets (BPNSs) adsorbents were prepared by a ball-milling method, and their adsorption-desorption performances were tested by batch adsorption experiments. The results showed that Cu(ІI) can be completely reduced to Cu(І) without adding any additional reducing agents during the ball-milling process, owing to the ability of black phosphorus to provide electrons to Cu(ІI). Moreover, the produced Cu(І) species were firmly anchored on BPNSs surface through chemical bonds formed between Cu and P atoms, effectively preventing them from aggregating. As the active sites on BPNSs surface, Cu(I) species can adsorb dibenzothiophene or benzothiophene from fuel by forming π-complexation bonds with them. The maximum adsorption capacity of the adsorbent for dibenzothiophene and benzothiophene were 13.16 and 18.02 mg S/g, respectively. Besides, the adsorption desulfurization activity can be recovered well by adopting simple thermal treatment.
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JOURNAL OF MEMBRANE SCIENCE
·
2021
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IF 8.742
Siyu Zhou,Xiaoquan Feng,Junyong Zhu,Qiangqiang Song,Guang Yang,Yatao Zhang,Bart Van der Bruggen
Although membrane separations have evinced an enormous potential in the treatment of dye wastewater, the ubiquitous membrane fouling leads to a dramatic decline of separation efficacy and life span, impeding the progress of membrane-based applications. The copper-triazolate MOFs (CuTz-1) exhibit robust thermal and chemical stability with a unique feature of degrading organic molecules under the visible light, rendering them highly promising for construction of self-cleaning membrane. This study presents the utilization of photocatalytic MOFs (CuTz-1) for construction of the CuTz-1/graphene oxide (CuTz-1/GO) composite membranes via filtration-assisted assembly followed by chemical crosslinking. The presence of CuTz-1 among the GO nanosheets promotes an enhancement of the GO interlayer distance, thereby promoting a higher water flux without compromising the dye rejections. The best-performing CuTz-1/GO membranes exhibits the high water permeance of 40.2 L m −2 h −1 bar −1 and superior dye rejections (Congo red: 99.4%, direct red: 98.2%, methyl blue: 94.9%), low salt rejections (e.g., NaCl: 0.3% and Na 2 SO 4 : 19.6%), as well as long-term nanofiltration stability. Furthermore, after visible light irradiation, the treated membrane was nearly recovered to have the original separation efficacy due to effective photocatalytic removal of the attached dyes from the membrane surface. The CuTz-1/GO membrane also exhibits an ultra-high bacteriostasis rate of 100%, probably to be ascribed to the combined antimicrobial effect of CuTz-1 and GO. This work is expected to give a useful guideline for developing loose nanofiltration membranes with favorable photocatalytic and antimicrobial properties, offering an appropriate solution of using self-cleaning membranes for the treatment of dye wastewater.
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JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Sisi Zhang,Jiayi Zhu,Xiwang Zhang,Runliang Zhu,Fei Ge,Yin Xu
Zero-valent Cu-Fe bimetallic porous carbon materials were successfully applied to remediate organic wastewater. In this work, we successfully recycled the layered double hydroxides (LDHs) adsorbed with Orange II (OII) to form a zero-valent Cu-Fe bimetallic porous carbon material (CuFe/Carbon). The characterization results showed that CuFe/Carbon was a zero-valent Cu-Fe bimetallic porous graphene-like carbon material. In the course of the experiment, we found that aeration condition had a great influence on the activity of CuFe/Carbon. The removal efficiency of nitrobenzene (NB) was 100 % in nitrogen system and 48 % in air system. The active species of O 2 − and O H was formed under air condition, while there was no active species under nitrogen condition. NB was reduced to aniline directly under nitrogen condition. We proposed there were reduction and oxidation mechanisms under different aeration conditions. This work mainly investigated the conversion process of a novel material under different reaction conditions, which provided theoretical support for the removal of organic matters.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2020
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IF 5.774
Handong Jiao,Jianxun Song
Owing to the enhanced selective depolarization effect of the liquid Cu, Ti has been successfully collected from mixed oxide ores or slags by using advanced molten oxide electrolysis (MOE) configuring with a liquid Cu cathode. However, the products prepared via above process are Cu-Ti alloys. Additional process is needed for the separation of Ti from those alloys. To achieve this goal, here, we selected a simple electrochemical approach to separate Ti from the Cu-Ti alloys in molten salt. Compared to the pure Cu electrode, the Cu-Ti alloys with different Ti contents show more negative electro-oxidation potential, which, in principle, indicates that Ti could be electrochemically extracted from the Cu-Ti alloys. Furthermore, the results of constant current electrolysis show that the effective separation of Ti is affected by the anodic current density and the Ti content in the Cu-Ti alloys. Specifically, the anodic current density, enabling the effective separation of Ti, increases with the increase of the Ti content in the Cu-Ti alloys. We have fitted a relationship equation between the anodic current density and the Ti content, which will be helpful for guiding separation of Ti from the Cu-Ti alloys. These findings confirm the feasibility of the molten salt electrolysis for the separation of Ti, and also make the Ti extraction based on the advanced MOE a complete process.
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