JOURNAL OF HAZARDOUS MATERIALS
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2024
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IF 12.2
Ziyang Chu,Zhengyan Han,Haibo Liu,Tianhu Chen,Xuehua Zou,Hanlin Wang,Fuwei Sun,Hao Wang,Dong Chen
The simultaneous removal of heavy metal complexes (HMCs) and heavy metal ions presents a significant challenge in treating wastewater. To address this, we propose a Calcite/Peroxymonosulfate (Calcite/PMS) system aimed at simultaneously decomplexing Cu-EDTA and removing Cu ions . Calcite/PMS system could achieve 99.5 % Cu-EDTA decomplexation and 61.9 % Cu ions removal within 60 min under initial conditions of Cu-EDTA (10 mg/L), Calcite (3 g/L), and PMS (2 mM). Singlet oxygen ( 1 O 2 ) emerged as the predominant reactive species responsible for Cu-EDTA decomplexation, which selectively targeted the N-C bonds in the Cu-EDTA structure to produce intermediates with lower biotoxicity than EDTA. Interestingly, solid phase Cu(III) (≡Cu(III)) promoted the generation of superoxide radicals (O 2 •− ) with a contribution of up to 72.8 %. Subsequently, nascent ≡Cu(III) and O 2 •− accelerated the degradation of intermediates. Besides, coexisting organic substances inhibited Cu-EDTA decomplexation, whereas inorganic ions had a weak impact. After five cycles of use, the Calcite/PMS system retained 99.3 % efficiency in decomplexing Cu-EDTA. This investigation provides valuable insights into using calcite to remove HMCs and enhances our comprehension of the decomplexation intermediates accelerating HMCs degradation.
研究领域:
环境科学
·
化学
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DOI
PubMed
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2024
·
IF 8
Rui Liao,Jun Wang,Shichao Yu,Xin Sun,Shitong Liu,Baojun Yang,Guanzhou Qiu
Chalcopyrite has evolved into a crucial source of copper pollution, and xanthates inevitably coexisted with chalcopyrite in mine environments. However, the effect of xanthate on chalcopyrite bio-dissolution has not been illustrated yet. To fill this knowledge gap, the effect of potassium amyl xanthate (KAX) on copper release from chalcopyrite mediated by Acidithiobacillus ferrooxidans was investigated. The results revealed that KAX promoted chalcopyrite bio-dissolution, indicating more copper ions were released into the environment under these circumstances. KAX treatment groups displayed a lag period in ferrous ion oxidation, thereby providing a more favorable redox potential for chalcopyrite bio-dissolution. Bacterial adsorption experiments indicated the number of free cells increased with the addition of KAX, hence the Fe 3+ regeneration was accelerated. Elemental composition analyses indicated the addition of KAX was conducive to reducing the formation of passivation substance (S n 2− /S 0 ). Additionally, the reduced surface tension of solution in KAX treatment groups was beneficial for the oxidant diffusing into the pores and cracks of chalcopyrite. This study provided a better comprehension of the effect of xanthate on copper pollution caused by chalcopyrite bio-dissolution, as well as a step toward better guidance in preventing copper pollution at source.
研究领域:
微生物学
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环境科学
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DOI
PubMed
高影响因子
MINERALS ENGINEERING
·
2020
·
IF 3.795
Bingqiao Yang,Hai Yan,Mengyuan Zeng,Pengliang Huang,Feifei Jia,Aiping Teng
In this work, the effect of Na 2 S 2 O 3 and the mixture of Na 2 S 2 O 3 and Cu 2+ on the selective flotation performances of chalcopyrite and molybdenite were investigated through single and mixed mineral flotation tests. The depression mechanisms were studied in detail through Zeta potential, contact angle, XPS and Raman measurement. The results indicated that Na 2 S 2 O 3 had more powerful depression effect on chalcopyrite than that on molybdenite. The depression could be greatly enhanced with the addition of Cu 2+ without losing selectivity. XPS and Raman measurement revealed that Na 2 S 2 O 3 and Cu 2+ chemically adsorbed on chalcopyrite surface, formation of CuS which was responsible for the depression. On the other hand, the surface of molybdenite was slightly affected after the treatment in the mixed solution of Na 2 S 2 O 3 and Cu 2+ . This new depressant had the advantage of low cost and environment friendly over conventional depressant, which could be utilized as an alternative depressant for the selective flotation separation of chalcopyrite and molybdenite.
研究领域:
矿物加工工程
·
表面化学
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
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IF 7.489
Yunqi Fu,Qi Li,Jianan Liu,Yanqing Jiao,Shan Hu,Hong Wang,Shuo Xu,Baojiang Jiang
Cu 2 O is widely used in the visible-light photocatalytic field, but its photocatalytic activity and stability still need to be further enhanced. Thus, searching for an efficient method to inhibit photocorrosion of Cu 2 O and boost its photogenerated charge carriers’ separation is very important and challenging. Herein, Cu 2 O@CuS core-shell hexapetalous flowers were synthesized by hydrothermal and in-situ chemical vapor deposition (CVD) strategy. The Cu 2 O hexapetalous flowers were firstly obtained through hydrothermal procedure, and then CuS in-situ grew on Cu 2 O to form core-shell structure by CVD, which effectively inhibited the photocorrosion of Cu 2 O. Meanwhile, Cu 2 O@CuS core-shell structure could extend their light absorption ranges from 200 to 1500 nm; promote the separation of electrons and holes in photocatalytic system. Thus, under the wide-spectral region, Cu 2 O@CuS exhibited excellent photocatalytic performance for the degradation of tetracycline at 91% with good cycling ability, resulting from the effective separation of photogenerated charges, more free radicals such as OH and O 2 − , increases of utilization rate of visible-light. These results indicate that in-situ CVD strategy is a feasible method to improve visible-light photocatalytic activity and stability of Cu 2 O.
研究领域:
材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
Electronic Materials Letters
·
2015
·Vol. 11
·期 4
·702-706
·
IF 1.98
Han Wen-Song
In this manuscript, the third-generation hyperbranched polyester was synthesized with 2, 2-dimethylol propionic acid as AB 2 monomer and pentaerythrite as core molecule by using step by step polymerization process at first. Then, the Cu-Ag particles were prepared by co-reduction of silver nitrate and copper nitrate with ascorbic acid in the aqueous solution using hyperbranched polyester as template. Finally, the Cu-Ag@Ag particles were prepared by coating silver on the surface of Cu-Ag particles by reduction of silver nitrate. The synthesized hyperbranched polyester and Cu-Ag@Ag particles were characterized by Fourier transform infrared (FT-IR) spectroscopy, UV-vis spectra, x-ray diffraction, Laser light scattering, thermogravimetric analysis (TGA) and SEM. UV-vis spectra results showed that the Cu-Ag@Ag particles had a strong absorption band at around 420 nm. Laser light scattering and SEM studies confirmed that the most frequent particle sizes of Cu-Ag@Ag particles were 1.2 um. TGA results indicated that the Cu-Ag@Ag particles had good thermal stability.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
WATER RESEARCH
·
2014
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IF 5.323
Long-Fei Wang,Nuzahat Habibul,Dong-Qin He,Wen-Wei Li,Xing Zhang,Hong Jiang,Han-Qing Yu
Copper nanoparticles (CuNPs) are widely used and inevitably released into aqueous environments, causing ecological and health risks. Ubiquitous natural organic matter (NOM) might affect the copper release behaviors from CuNPs and their toxicity. This work aims to elucidate how NOM affects copper release from CuNPs, with a focus on the impacts of NOM properties and the NOM-CuNPs interaction mechanism. The copper release kinetics and different copper fractions induced by representative NOMs were characterized. The presence of NOM led to a more dispersive state of CuNPs clusters. Copper release mainly resulted from complexation reactions between CuNPs and functional groups of NOM. Humic substances were more effective in releasing copper than sodium alginate and bovine serum albumin, due to a higher amount of functional groups and lower molecular weight , which facilitated the contact and complexion reactions. Chlorination treatment of NOM significantly decelerated copper release due to the destruction of functional groups and less attachment of NOM. However, the copper releasing ability of humic acid was not substantially affected by Ca 2+ -induced coagulation. This study provides better understanding about the persistence and transformation of CuNPs in aquatic environments.
研究领域:
环境科学
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毒理学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF RARE EARTHS
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2017
·
IF 2.429
Linying Du,Weiwei Wang,Han Yan,Xu Wang,Zhao Jin,Qisheng Song,Rui Si,Chunjiang Jia
Copper-ceria sheets catalysts with different loadings of copper (2 wt.%, 5 wt.% and 10 wt.%) supported on ceria nanosheets were synthesized via a deposition–precipitation (DP) method. The prepared catalysts were systematically characterized with various structural and textural detections including X-ray diffraction (XRD), Raman spectra , transmission electron microscopy (TEM), X-ray absorption fine structure (XAFS), and temperature-programmed reduction by hydrogen (H 2 -TPR), and tested for the CO oxidation reaction. Notably, the sample containing 5 wt.% of Cu exhibited the best catalytic performance as a result of the highest number of active CuO species on the catalyst surface. Further increase of copper content strongly affects the dispersion of copper and thus leads to the formation of less active bulk CuO phase, which was verified by XRD and H 2 -TPR analysis. Moreover, on the basis of in-situ diffuse reflectance infrared Fourier transform spectroscopy ( in-situ DRIFTS) results, the surface Cu + species, which are derived from the reduction of Cu 2+ , are likely to play a crucial role in the catalyzing CO oxidation. Consequently, the superior catalytic performance of the copper-ceria sheets is mainly attributed to the highly dispersed CuO x cluster rather than Cu-[O x ]-Ce structure, while the bulk CuO phase is adverse to the catalytic activity of CO oxidation.
研究领域:
材料科学
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催化化学
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产品关联
DOI
高影响因子
International Journal of Mining Science and Technology
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2021
·
IF 4.084
Jinpeng Cai,Peilun Shen,Dianwen Liu,Xiaolin Zhang,Jianjun Fang,Chao Su,Xingcai Yu,Jiangli Li,Han Wang
In this work, the growth of copper sulfide crystal onto azurite surfaces during sulfurization and its response to flotation are investigated. Filed emission scanning electron microscopy-energy dispersive X-ray spectroscopy (FESEM) and X-ray diffraction (XRD) studies confirmed that the sulfurization of azurite is not limited to the mineral surface, but rather penetrates into the bulk to form covellite crystal (syn-CuS), creating favorable conditions for the stable adsorption of xanthate and greatly promoting the azurite flotation. Additionally, as demonstrated by X-ray photoelectron spectroscopy (XPS) and time of flight secondary ion mass spectrometry (TOF-SIMS) analyses, a redox reaction occurred during this process, and Cu(Ⅱ) onto the mineral surface was reduced to Cu(I). Correspondingly, reduced S 2- was oxidized to (S 2 ) 2- , (S n ) 2- , and even to deeper oxidation state S 0 , (S x O y ) n- and SO 4 2- . Excess sodium sulfide strengthens copper sulfide to form onto the azurite surface, and provides enough raw material for crystal copper sulfide to grow, resulting in the formation of “flake-like” covellite with a better crystallinity. However, the floatability of azurite decreased dramatically under this condition, because the generated massive colloidal copper sulfide in flotation pulp deteriorates the flotation environment, resulting in a decreased effective adsorption of collector onto azurite surfaces.
研究领域:
矿物学
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浮选化学
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产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMISTRY
·
2025
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IF 5.5
Changyan Guo,Yanqiu Ma,Yonghong Zhang,Jianghua Pei,Fangshu Han,Shuai Yang,Jide Wang
Comprehensive Summary Cu-BTC (BTC = 1,3,5-benzenetricarboxylic acid) framework faces environmental and scalability challenges in conventional synthesis due to energy-intensive processes, using toxic solvents and costly precursors, with nanoparticle integration further complicating production through multi-step procedures that degrade structural integrity. This study developed an innovative ambient-temperature synthesis of Cu-N coordinated Cu-BTC MOF containing dispersed Cu/Cu₂O nanoparticles using economical Cu 0 powder. The N-ligand-mediated oxidation and deprotonation simultaneously achieve: (1) incorporation of 5 nm nanoparticles, (2) in situ formation of catalytic Cu–N bonds, and (3) manifestation of multifunctional catalytic performance. The Cu/Cu₂O@Cu-BTC/N composite demonstrates outstanding catalytic activity, achieving high yields across multiple reactions: 91% in Knoevenagel condensation, 89% in Sonogashira coupling, 99% in Ullmann-type C–N coupling, and 97% in indole C2-acylation, along with exceptional photocatalytic hydrogen evolution performance (7.06 mmol·g –1 ·h –1 ). Notably, the synthetic protocol demonstrates excellent scalability, maintaining 90% yield at both 1 g and 10 g scales, thereby establishing a sustainable pathway for large-scale production of multifunctional MOF catalysts with promising applications in green chemistry and energy-related fields.
研究领域:
材料化学
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催化化学
·
纳米材料
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绿色化学
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能源化学
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配位化学
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2019
·Vol. 20
·期 6
·1469
·
IF 4.183
Xuerong Zhou,Ling Zhao,Jie Luo,Huaqiao Tang,Min Xu,Yanyan Wang,Xiaoyu Yang,Helin Chen,Yinglun Li,Gang Ye,Fei Shi,Cheng Lv,Bo Jing
Research has shown that nano-copper (nano-Cu) can cause damage to the spleen and immune system yet their mechanisms of cytotoxicity are poorly understood. Our aim is to explore the potential immunotoxicity in the spleen of rats after nano-Cu exposure. The results of hematologic parameters, lymphocyte subsets, immunoglobulins, and histopathology indicated that copper obviously changed the immune function of the spleen. The levels of antioxidants (SOD, CAT, GSH-Px), oxidants (iNOS, NO, MDA), and anti-oxidative signalling pathway of Nrf2 (Nrf2 and HO-1) were strongly induced by nano-Cu. The expression of mRNA and protein of pro-/anti-inflammatory (IFN-γ, TNF-α, MIP-1α, MCP-1, MIF, IL-1/-2/-4/-6) cytokines were increased by nano-Cu. The expression of regulatory signal pathways, MAPKs and PI3-K/Akt were activated, which might be involved in the inflammatory responses and immunomodulatory processes of sub-acute nano-Cu exposure. The immune function of the spleen was repressed by nano-Cu induced oxidative stress and inflammation.Keywords:nano-Cu;rats;spleen injury;immune system;oxidative stress
研究领域:
毒理学
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免疫学
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分子生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Xin Liu,Peng Xu,Qi Fu,Runhan Li,Chenxi He,Wenxuan Yao,Lei Wang,Shiqi Xie,Zhiyi Xie,Jingwei Ma,Qiulai He,John C. Crittenden
Zero-valent copper activated peroxymonosulfate (ZVC/PMS) system was widely used to degrade refractory contaminants due to being highly effective. However, the low reactivity and easy dismutation of cuprous species (Cu(I)) in acid condition limited its efficiency. In our study, ZVC coupled with ferrous ion (Fe(II)) promoted PMS to degrade orange II. Multiple oxidants including Cu(III), OH and SO 4 − made main contribution on orange II degradation in the Fe(II)/ZVC/PMS system. In the Fe(II)/ZVC/PMS system, ZVC generated Cu(I) by H + corrosion and PMS oxidation, and Cu(I) reacted with oxygen producing hydrogen peroxide. Then, Fe(II) and Cu(I) catalyzed hydrogen peroxide and PMS to generate Cu(III), OH and SO 4 − , and thereinto Fe(III) was reduced to Fe(II) by ZVC and Cu(I). In the Fe(II)/ZVC/PMS system, water matrix including humic acid, sulfate and nitrate had no significant impact on orange II degradation, while chloride restrained the degradation of orange II. The Fe(II)/ZVC/PMS system exhibited great degradation for orange II in tap water, lake water and well water. Additionally, the Fe(II)/ZVC/PMS system degraded more than 90% of methyl orange, rhodamine B, acetaminophen, ibuprofen, propranolol and diclofenac. Through adjusting the final reaction solution to pH 8.5 and subsiding, the discharge of total copper met the II-level environmental quality standards for surface water in China (1 mg/L). Hence, the study provided a promising method to induce PMS for enhanced degradation of contaminants.
研究领域:
环境科学
·
化学工程
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产品关联
DOI
高影响因子
JOM
·
2022
·Vol. 75
·期 5
·1515-1529
·
IF 2.597
Ge Yang,Liu Zhihong,Yu Zhiqian,Wang Huanwen,Lu Xingwu,Zhang Leru,Xia Longgong
The present study focused on the Cu-Pb system and investigating the distribution behaviors of various minor elements through the equilibration-quenching-EPMA analysis experimental technique. Obtained results showed that: (1) An intermetallic compound consisting mainly of Cu-Pb-Se-Te formed below 956°C. (2) As, Sb and Sn had similar distribution behaviors, which mainly entered the solid Cu phase at the temperature range of 500–900°C, but became concentrated in the liquid alloy phase at temperature range of 900–1060°C, and their distribution ratios increased along with increasing temperature. (3) Bi was mainly found in the liquid alloy phase, and its distribution ratio ranged from 6.8 to 836.5 at the experimental conditions. (4) Se and Te formed an intermetallic alloy phase under 900°C, and they enriched in the liquid alloy phase between 960°C and 1060°C. (5) Au was mainly found in the solid Cu phase at the temperature range of 500–900°C, and its distribution ratio was about 1.5 at 900–1060°C. The distribution ratio of Ag decreased from 8.7 to 2.3 when increasing the temperature from 500°C to 1060°C. Distribution behavior of As, Sb, Bi and Sn is consistent with their interfacial enthalpies with Cu and Pb.
研究领域:
冶金学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）