CHEMOSPHERE
·
2019
·
IF 5.108
Siqian Liu,Yang Liu,Bo Pan,Ying He,Bowen Li,Dandan Zhou,Yinlong Xiao,Hao Qiu,Martina G. Vijver,Willie J.G.M. Peijnenburg
Humic substances are the dominant dissolved organic matter fraction in the aqueous phase of environmental media. They would inevitably react with chemicals released into the environment. The influence of dissolved humic acid (DHA) on the dissolution and dispersion of copper oxide nanoparticles (CuO NPs, 50 nm, 49.57 mg L −1 ) was therefore investigated in the present study. In addition to dispersing CuO NPs and reducing the size of the aggregates, the amount of released Cu from CuO NPs was found to increase over time with increasing concentrations of DHA, 96% of which was present as organic complexes after 72 h. At DHA concentrations exceeding 16.09 mg C L −1 , the complexation coefficients of DHA with Cu and the adsorptivity of CuO NPs to DHA were both reduced due to increased homo-conjugation of DHA as promoted by negative charge-assisted H-bond. Although the adsorption capacity of DHA kept increasing up to 57.07 mg C L −1 , the hydrodynamic diameter and ζ-potential were similar and the percentages of total released Cu continued to increase linearly to 4.92% at higher levels of DHA (30.13–57.07 mg C L −1 ). Thereupon, DHA promoted the dissolution of CuO NPs in a concentration-dependent fashion. The driving force was complexation of Cu by DHA, rather than the balancing between the exposed and the covered surface area of the CuO NPs due to DHA adsorption. Our findings facilitate understanding the underlying mechanisms on how DHA impacts the CuO NPs environmental behavior (or fate) as well as on their kinetics.
研究领域:
环境科学
·
化学
✓ 已验证
DOI
高影响因子
Biomass Conversion and Biorefinery
·
2024
·
IF 3.5
Ouyang Yue,Sun Wei,Tian Longjin,Liu Ying,Fan Guozhi,Pan Cheng,Cheng Qunpeng
In this study, the performance of biochar (BC)-supported cobalt (Co) and copper (Cu) (CoCu@BC) on tetracycline (TC) adsorption in aqueous solution and piggery wastewater was investigated. Scanning electron microscopy (SEM), Brunauer–Emmett–Teller (BET) surface area, Fourier-transform infrared (FTIR) spectroscopy, and X-ray diffraction (XRD) were used to characterize the CoCu@BC adsorbent. The influence of initial pH, TC concentration, adsorbent dosage, and co-existing ions on TC adsorption performance was studied. Meanwhile, the adsorption kinetics, isotherm, and diffusion models were studied. The results showed that the CoCu@BC was characteristic of 142.1745 m 2 ·g −1 (BET surface area), 0.035987 cm 3 ·g −1 (microspore volume), and 3.74 (pH PZC ). The adsorption of TC on CoCu@BC well fitted with the pseudo-second-order model and the Freundlich isotherm. The maximum adsorption capacity of CoCu@BC was 621.118 mg/g, which was less influenced by pH while greatly inhibited by NO 2 − and SO 4 2− . Finally, the removal of TC (94.5%), NH 4 + -N (27%), and COD (18%) by CoCu@BC was carried out in piggery wastewater, indicating its superior performance in practice application.
研究领域:
环境科学
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污染控制
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材料科学
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产品关联
DOI
高影响因子
POLYHEDRON
·
2022
·
IF 2.975
Yan-Ling Deng,Wei Li,Chun-Yang Pan
Two new metal hybrid borates , Na[Ni(py) 2 ] 2 ·[(C 4 H 2 O 6 ) 2 B]·H 2 O (py = pyridine) ( 1 ) and [Cu(H 2 O) 2 (1-EI) 4 ]·[B 5 O 6 (OH) 4 ] 2 ·H 2 O (1-EI = 1-ethylimidazole) ( 2 ), have been successfully synthesized. 1 features an interesting structure based on mixed borate-tartrate motifs. Two tartrate anions are condensed with one BO 4 to form the hybrid anionic group [(C 4 H 2 O 6 ) 2 B] 5− . The structure of 2 is composed of [B 5 O 6 (OH) 4 ] − clusters and [Cu(H 2 O) 2 (1-EI) 4 ] 2+ complexes, which exhibits hydrogen-bonded network formed by [B 5 O 6 (OH) 4 ] − clusters. These compounds are further confirmed by FTIR, PXRD and UV–vis. In addition, the catalyst prepared from 2 shows excellent electrocatalytic oxygen reduction reaction (ORR) activity.
研究领域:
无机化学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2025
·
IF 5.8
Xianchang Liang,Wenjing Wang,Mingyuan Tang,Yuanyuan Kang,Mingjun Cui,Haichao Zhao
The direct use of antimicrobial agents has problems such as high effective dose and short antimicrobial duration. Therefore, encapsulation of antimicrobial agents in nanocontainers can improve stability and antimicrobial efficiency, reduce the risk of drug resistance, and lower the environmental impact. In this study, biomass-based Schiff base ligand (LAE-oVan) was synthesized by condensation of ethyl lauroyl arginate HCl and ortho-vanillin. Bio-based Schiff base copper complex intercalated montmorillonite was then prepared by pretreated montmorillonite (MMT) with Cu 2+ exchange, followed by chelation with LAE-oVan to form antimicrobial nanocomposites (LAE-oVan-Cu@MMT). Release behavior studies have shown that LAE-oVan-Cu@MMT has a release time of up to 2250 min, and the releasable amount of Cu 2+ and LAE-oVan was calculated to be about 35 %. Antibacterial activity was studied by zone of inhibition method, minimum inhibitory concentration method, plate colony counting method and biofilm method. The results showed that LAE-oVan-Cu@MMT achieved 99.99 % antibacterial ratio against Escherichia coli (E. coli) at 25 μg/mL within 1.5 h and Staphylococcus aureus (S. aureus) at 25 μg/mL within 3 h. Biofilms gradually decreased with increasing concentrations of LAE-oVan-Cu@MMT. Moreover, cytotoxicity studies showed that LAE-oVan-Cu@MMT had a low toxicity to L929 cells. This study provides a strategy for the development of novel antimicrobial with low toxic, eco-friendly and long term release efficiency.
研究领域:
材料科学
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微生物学
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环境科学
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产品关联
DOI
高影响因子
Nature Communications
·
2022
·Vol. 13
·期 1
·1-13
·
IF 17.694
Yang Baiyu,Chen Ling,Xue Songlin,Sun Hao,Feng Kun,Chen Yufeng,Zhang Xiang,Xiao Long,Qin Yongze,Zhong Jun,Deng Zhao,Jiao Yan,Peng Yang
Electrocatalytic reduction of CO 2 into alcohols of high economic value offers a promising route to realize resourceful CO 2 utilization. In this study, we choose three model bicentric copper complexes based on the expanded and fluorinated porphyrin structure, but different spatial and coordination geometry, to unravel their structure-property-performance correlation in catalyzing electrochemical CO 2 reduction reactions. We show that the complexes with higher intramolecular tension and coordination asymmetry manifests a lower electrochemical stability and thus more active Cu centers, which can be reduced during electrolysis to form Cu clusters accompanied by partially-reduced or fragmented ligands. We demonstrate the hybrid structure of Cu cluster and partially reduced O-containing hexaphyrin ligand is highly potent in converting CO 2 into alcohols, up to 32.5% ethanol and 18.3% n- propanol in Faradaic efficiencies that have been rarely reported. More importantly, we uncover an interplay between the inorganic and organic phases to synergistically produce alcohols, of which the intermediates are stabilized by a confined space to afford extra O-Cu bonding. This study underlines the exploitation of structure-dependent electrochemical property to steer the CO 2 reduction pathway, as well as a potential generic tactic to target alcohol synthesis by constructing organic/inorganic Cu hybrids.
研究领域:
化学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Science Bulletin
·
2025
·
IF 21.1
Qingyu Wang,Yangyang Wan,Qichen Liu,Yida Zhang,Zhentao Ma,Zirui Xu,Pengting Sun,Gongming Wang,Hai-Long Jiang,Wenping Sun,Xusheng Zheng
Photocatalytic urea production from nitrogen (N 2 ) and carbon dioxide (CO 2 ) is a sustainable and eco-friendly alternative to the Bosch-Meiser route. However, it remains a significant challenge in developing highly efficient photocatalysts for enhancing C-N coupling to high-yield urea synthesis. Herein, we propose a multi-site photocatalyst concept to address the concern of low yield by simultaneously improving photogenerated carrier separation and reactant activation. As a proof of concept, a well-defined multi-site photocatalyst, Ru nanoparticles and Cu single atoms decorated CeO 2 nanorods (Ru-Cu/CeO 2 ), is developed for efficient urea production. The incorporation of Ru and Cu sites is crucial not only to generate high-density photogenerated electrons, but also to facilitate N 2 and CO 2 adsorption and conversion. The in situ formed local nitrogen-rich area at Ru sites increases the encounter possibility with the carbon-containing species generated from Cu sites, substantially promoting C-N coupling. The Ru-Cu/CeO 2 photocatalyst exhibits an impressive urea yield rate of 16.7 μmol g −1 h −1 , which ranks among the best performance reported to date. This work emphasizes the importance of multi-site catalyst design concept in guaranteeing rapid C-N coupling in photocatalytic urea synthesis and beyond.
研究领域:
化学工程
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材料科学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2024
·
IF 4.1
Zhou Bai-Yang,Ma Ze-Tong,Zhong Shi-Long,Huang Zhen-Jie,Guo Qi,Feng Deng-Chong,Yuan Zhong-Ke,Lu Shao-Lin,Yang Yu-Zhao,Wang Cheng,Yu Ding-Shan,Chen Xu-Dong
The burgeoning growth of the new energy vehicles and aviation industry has escalated the need for energy storage capacitors capable of stable operation in harsh environments. The advent of metal-polyimide complexes has illuminated a novel approach for preparing temperature-resistant capacitors. However, the general application of these metal-polyimide complexes is impeded by the high dielectric loss and low breakdown strength, consequences of main-chain coordination and excessive metal ions content. Herein, our study proposes a novel polyimide-Cu complex material (POP-Cu) predicated on side-chain-type pyridine-Cu coordination, utilizing the structural backbone PMDA-ODA of mature commercial PI (Kapton) with reliable performance. Owing to the high degree of freedom afforded by the side chain with suppressed relaxation activation energy and the long-range electron delocalization formed by d - π coordination, the dielectric constant of this material containing merely 2.7 mol% Cu increases from 3.25 (POPI) to 5.58, while maintaining a remarkably low dielectric loss of 0.0066. Meanwhile, this material exhibits a substantial DC breakdown strength of 436.2 MV·m −1 and a high energy density of 5.42 J·cm −3 , coupled with superior mechanical and thermal properties. Even at 150 °C, it retains over 90% of its room-temperature energy density, demonstrating notable dielectric stability under high temperatures. These attributes underscore its promising application for capacitors operating in harsh environments.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Hui Hong,Minghao Xu,Xuerui Yang,Lei Zhou,Jean-Marc Chovelon,Guangli Xiu
Copper-based catalysts have been widely used in heterogeneous advanced oxidation processes (AOPs) to degrade emerging contaminants, with trivalent copper species (Cu(III)) often identified as crucial intermediates. However, the current understanding of the reactivity and potential oxidation mechanism associated with such reactive species remains quite limited. In the present study, a stable Cu(III) complex was synthesized, and its reactivity towards a typical fluoroquinolone antibiotic, ofloxacin (OFX), was comprehensively investigated. The results revealed that Cu(III) itself functioned as the primary oxidizing agent instead of secondary hydroxyl radicals generated during OFX decomposition, which exhibited high reactivity over a wide pH range (3.0–9.0) with molar ratio of Cu(III) to OFX between 1:2 and 3:1. Interestingly, prevalent constituents of natural water, including (bi)carbonate (0–10 mM), chloride (0–10 mM), nitrate (0–10 mM) and humic acid (0–30 mg/L), displayed minimal influence on the oxidation efficiency of Cu(III). Piperazine moiety was identified as the primary reaction site, and three different pathways including tertiary amine oxidation, hydroxylation, and N-demethylation process were proposed. The detailed oxidation mechanisms were further illustrated by density functional theory (DFT) calculations. This study contributes to the theoretical foundation for investigating the mechanism of Cu(III)-mediated oxidation of antibiotics.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Weicheng Xu,Jinzhi Liang,Jianghong Li,Suresh C. Pillai,Fawen Liang,Meng Li,Kaibang Xiao,Jiesen Li,Yu Wang,Xueding Jiang,Zhang Liu,Jingzi Beiyuan,Hailong Wang
A three-dimensional (3D) flower-like zero-valent bimetallic shell/core iron/copper/biochar composite (NZVI/Cu 0 /BC) was synthesized for the purpose of removing antibiotic metronidazole (MNZ) through the activation of peroxymonosulfate (PMS). Under optimal conditions, complete removal of MNZ (10 mg/L) was achieved within 6 min. The study quantitatively investigated the contribution of different participants in the complex system, including carbon composites, Fe and Cu species, and radicals and nonradicals. Based on the characterization and analysis data, possible activation mechanisms were proposed, which involved the oxygenated functional groups of BC and the bimetallic structure feature of NZVI/Cu 0 accelerating the generation of 1 O 2 and other oxidation species. Additionally, the synergistic effect of Cu-Fe-BC facilitated the redox cycle of Cu 2+ /Cu + and Fe 3+ /Fe 2+ , thereby promoting radical in the NZVI/Cu 0 /BC-3/PMS system. Notably, NZVI/Cu 0 /BC-3 has the advantages of wide pH usable range as well as broad-spectrum adaptability towards various organic pollutant and various water environments. Density functional theory (DFT) results indicated that the adsorption energy of PMS onto NZVI/Cu 0 /BC was more negative compared to their individual adsorption energies, and the O-O bond in the structure of PMS molecules became weaker after adsorption, resulting in improved efficiency of PMS activation. Liquid chromatograph combined with mass spectrometry (LC-MS) measurement and DFT calculation suggested three main degradation pathways of MNZ, and the toxicities of their intermediates were evaluated.
研究领域:
环境科学
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材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Kai Xiong,Ying Zhou,Johannes Karges,Kejie Du,Jinchao Shen,Mingwei Lin,Fangmian Wei,Junfeng Kou,Yu Chen,Liangnian Ji,Hui Chao
Chemotherapy continues to be the most commonly applied strategy for cancer. Despite the impressive clinical success obtained with several drugs, increasing numbers of (multi)drug-resistant tumors are reported. To overcome this shortcoming, novel drug candidates and delivery systems are urgently needed. Herein, a therapeutic copper polypyridine complex encapsulated in natural nanocarrier apoferritin is reported. The generated nanoparticles showed higher cytotoxicity toward various (drug-resistant) cancer cell lines than noncancerous cells. The study of the mechanism revealed that the compound triggers cell autophagy-dependent apoptosis. Promisingly, upon injection of the nanodrug conjugate into the bloodstream of a mouse model bearing a multidrug-resistant colon tumor, a strong tumor growth inhibition effect was observed. To date, this is the first study describing the encapsulation of a copper complex in apoferritin that acts by autophagy-dependent apoptosis.
研究领域:
肿瘤学
·
药理学
·
纳米医学
✓ 已验证
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Ding Hu,Hongxia Xu,Bing Xiao,Dongdong Li,Zhuxian Zhou,Xiangrui Liu,Jianbin Tang,Youqing Shen
Many metal–organic complexes showed potent anticancer efficacy, but their clinical applications were limited by the lack of administration route because of their poor solubility. To make metal–organic nanoparticles (MONPs) comprising metal complex drugs is a new formulation strategy for their administration. Herein, we developed a facile synthesis of an MONP composed of bovine serum albumin (BSA), Cu2+, and an anticancer agent, 5-nitro-8-hydroxyquinoline (NQ) with albumin as a nanoreactor. The resultant BSA/Cu/NQ nanoparticle (BSA/Cu/NQ NP) showed good stability in different physiological buffers and could target tumors through the enhanced permeability and retention effect and receptor-mediated cellular uptake. As the BSA/Cu/NQ NP could be readily and efficiently internalized by cancer cells, it showed much higher cytotoxic cancer cells than the NQ + Cu(II) complex and NQ. Therefore, the treatment with BSA/Cu/NQ NP noticeably enhanced the anticancer efficacy without causing systemic toxicity, indicating that such a facile preparation method has great potential to prepare other metal complex nanoparticles for drug delivery.
研究领域:
药剂学
·
肿瘤学
·
纳米医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Huaiwei Zhang,Liang Bao,Qingwei Zhou,Ying Pan,Jingyuan Ge,Jia Du
The photocatalytic performance of ceria-based materials can be tuned by adjusting the surface structures with decorating the transition-metal, which are considered as the important active sites. Herein, cuprous oxide-metallic copper composite - doped ceria nanorods were assembled through a simple hydrothermal reduction method. The photocatalytic ammonia synthesis rates exhibit an inverted “V-shaped” trend with increasing Cu 0 /Cu x O mole ratio. The best ammonia production rate, approximately 900 or 521 µmol·g cal −1 ·h −1 under full-spectra or visible light , can be achieved when the Cu 0 /Cu x O ratio is approximately 0.16, and this value is 8 times greater than that of the original sample. The absorption edge of the as-prepared samples shifted towards visible wavelengths, and they also had appropriate ammonia synthesis levels. This research provides a strategy for designing noble metal-free photocatalysts through introducing the metal/metallic oxide composites to the catalysts.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）