Environmental Science-Advances
·
2023
·Vol. 2
·期 3
·495-507
·
IF 0
Yong Cheng,Lin Deng,Dan Wang,Xiuxiu Wang,Changchun Ji,Ying-Hua Zhou
In this work, CuS@Cu-CD composites were synthesized and employed as Fenton-like catalysts. CuS significantly enhanced the photodegradation activity of tetracycline (TC) when decorated with Cu-doped-carbon dots (Cu-CDs). The influence of initial pH, dosage of catalyst, and H2O2 concentration on the catalyst performance was investigated. Radical trapping experiments proved that ·O2− and h+ played critical roles and ·OH played a moderate role in the degradation of TC. Mechanism analyses demonstrated that Cu2+/Cu+ redox circulation could be accelerated by the introduction of Cu into carbon dots, which further facilitated H2O2 consumption and resulted in higher TC degradation efficiency.
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INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Xin Li,Xiaodie Zhu,Haitao Tang,Jian Zhang,Min Zhou,Qingpeng Peng,Bin Meng,Shuang Wang,·Alexey·Nikolaevich Yakovlev,Lei Zhao,Jie Yu,Xuhui Xu
Scintillator is a key component in X-ray detectors that determine the performance of the devices. Nevertheless, due to the interference of the ambient light sources, scintillators are only operated in a darkroom environment currently. In this study, we designed a Cu+ and Al3+ co-doped ZnS scintillator (ZnS: Cu+, Al3+) that introduces donor–acceptor (D–A) pairs for X-ray detection. The prepared scintillator displayed an extremely high steady-state light yield (53,000 photons per MeV) upon X-ray irradiation, which is 5.3 times higher than that of the commercial Bi4Ge3O12 (BGO) scintillator, making it possible in X-ray detection with the interference of ambient light. Furthermore, the prepared material was employed as a scintillator to construct an indirect X-ray detector, which performed a superior spatial resolution (≈10.0 lp/mm) as well as persistent stability under visible light interference, demonstrating the feasibility of the scintillator in practical applications. Therefore, this research presented a convenient and useful strategy to realize X-ray detection in a non-darkroom environment.
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Environmental Earth Sciences
·
2021
·Vol. 81
·期 1
·1-11
·
IF 2.784
Suo Chongxian,Yao Xin,Song Zhiwei,Dong Xiaoqiang
There is an urgency to develop a more economical and environmentally friendly solidifier/stabilizer to treat the heavy metal contaminated soil with improved strength. In this study, the red mud, a kind of solid waste material from the alumina factory, was added into the soil to form the compound solidifier/stabilizer with cement to treat the copper-contaminated soil. The mechanical characteristics of solidified/stabilized soil were analyzed systematically, as well as the microstructure by SEM, EDS, and XRD. Besides, the leaching toxicity of solidified/stabilized soil was also tested. The results show that the red mud residue compound solidifier/stabilizer exhibits a better solidification efficiency than the pure cement, and the copper leaching amount values are all far below the standard limit. In this study, the red mud residue content is proposed as 15–45%. As for the stress–strain relationship characteristic of solidified/stabilized soil, it would differ notably with copper concentration. In addition, the microscopic analyses support the hydration products of solidified/stabilized soil that are mainly composed of hydrated calcium silicate/calcium silicate aluminate hydrate, calcium carbonate, and ettringite, which can solidify/stabilize the copper ion and increase the unconfined compressive strength. Thus, the red mud waste has great potential to be popularized as a source applied in heavy metal treatment.
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高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2019
·Vol. 25
·期 68
·15586-15593
·
IF 5.16
Rengui Li,Yixuan Yang,Na Sun,Long Kuai
Development of Pt group metal-free catalysts for low-temperature CO oxidation remains critical. In this work, active and stable mesoporous Cu-Ce-O x solid solutions are prepared by using spray pyrolysis. The specific surface areas and pore volumes reach as high as 170 m 2 g −1 and 0.24 cm 3 g −1 , respectively. The results of CO oxidation study suggest that (1) the catalyst obtained by spray pyrolysis possesses much higher activity than those made by co-precipitation, sol-gel, and hydrothermal methods; (2) the optimal Cu 0.2 -Ce 0.8 -O x solid solution presents a reactivity over 28 times that of both single-component CuO and CeO 2 at 70 °C. Based on the study of pure-phase Cu-Ce-O x solid solutions by selective leaching of segregated CuO x species, the active center for CO oxidation is confirmed as the bimetallic Cu-Ce-O site, whereas the individual CuO x particles not only act as spectators but also block the active Cu-Ce-O sites. A low apparent activation energy of approximately 48 kJ mol −1 is detected for CO oxidation at the Cu-Ce-O site, making Cu-Ce-O x solid solutions able to present high activity at low temperature. Furthermore, the Cu-Ce-O x catalysts exhibit excellent stability and thermal tolerance toward CO oxidation. Graphical Pt-free CO oxidation : Well-shaped mesoporous Cu-Ce-O x solid solutions were produced for low-temperature CO oxidation by using a nitrate spray pyrolysis route, and a selective leaching strategy was adopted to remove the surface segregated CuO x species. The bimetallic Cu-Ce-O site was confirmed as the active center for CO oxidation, whereas the individually segregated CuO x species not only acted as spectators, but also blocked the active Cu-Ce-O sites (see scheme).
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ACS Nano
·
2020
·
IF 14.588
Yuxuan Lin,Zhichao Huang,Xiaojie Wen,Wenhui Rong,Zhantao Peng,Mengxiao Diao,Lingbo Xing,Jingxin Dai,Xiong Zhou,Kai Wu
Among the multitudinous methodologies to steer on-surface reactions, less attention has been paid to the effect of externally introduced halogen atoms. Herein, highly selective trans-dehydrogenation coupling at the specific meta-C–H site of two poly(p-phenylene) molecules, p-quaterphenyl (Ph4) and p-quinquephenyl (Ph5), is achieved on Cu(111) by externally introduced bromine atoms. Scanning tunneling microscopy/spectroscopy experiments reveal that the formed molecular assembly structure at a stoichiometric ratio of 4:1 for Br to Ph4 or 5:1 for Br to Ph5 can efficiently promote the reactive collision probability to trigger the trans-coupling reaction at the meta-C–H site between two neighboring Ph4 or Ph5 molecules, leading to an increase in the coupling selectivity. Such Br atoms can also affect the electronic structure and adsorption stability of the reacting molecules. It is conceptually demonstrated that externally introduced halogen atoms, which can provide an adjustable halogen-to-precursor stoichiometry, can be employed to efficiently steer on-surface reactions.
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高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Shuai Tang,Lujian Lin,Xuesong Wang,Anxin Feng,Xue Feng,Jing Kong
The kinetics of Cu(II) and fulvic acid (FA) adsorption onto biochar has been investigated. The modified biochar samples derived from rice husks were characterized by scanning electron microscopy equipped with the energy-dispersive X-ray spectroscope and Fourier transform-infrared spectroscopy. Some characteristic parameters, such as specific surface area and zeta potential, were also determined. The optimum condition of Cu(II) adsorption was temperature of 308 K, 2 g L –1 of adsorbent dosage and 25 mg L –1 of FA concentration. The maximum removal efficiencies of Cu(II) ions and FA were almost 81% and 94%, respectively. The experimental data for adsorption of Cu(II) and FA on modified biochar was fitted by various adsorption kinetic models. The results showed that the pseudo-second-order equation was the best-suited model. Elovich equation was consistent with the experimental data suggested chemical interactions between modified biochar and adsorbates. Also, the intraparticle diffusion model fitted the experimental data well, indicating that the process of Cu(II) and FA adsorption was diffusion-controlled. In addition, complexation reactions between FA and Cu(II) promoted the adsorption of adsorbates on modified biochar. The relatively high desorption efficiency proves the strong regeneration capacity of modified biochar.
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高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2019
·Vol. 102
·期 10
·5989-5996
·
IF 3.094
Yue-Xing Chen,Kang-Di Shi,Fu Li,Xiao Xu,Zhen-Hua Ge,Jiaqing He
In recent years, BiCuSeO oxyselenides have been developed as a promising thermoelectric material. In this article, Pb x Bi 1− x Cu 1− y SeO ( x = y = 0, 0.02, 0.04, 0.06, and 0.08) are prepared by solid-state reaction method and spark plasma sintering (SPS), and the combinatorial effects of Pb doping and Cu deficiencies on thermoelectric properties are investigated systematically. The transport properties are significantly enhanced due to the optimized carrier density, majorly contributing to the promotion of ZT values. As a result, the maximum ZT of 0.77 at 873 K and average ZT (from 300 to 873 K) of 0.50 are obtained for Pb 0.06 Bi 0.94 Cu 0.94 SeO sample. The values are 0.4 and 1.2 times, respectively, higher than that of pristine sample.
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MATERIALS LETTERS
·
2012
·
IF 2.307
Shiguo Chen,Yujuan Guo,Shaojun Chen,Zaochuan Ge,Haipeng Yang,Jiaoning Tang
Incorporation of nanoparticles is becoming a new strategy for improving antibacterial activity . In this paper, Copper (Cu)/titanium dioxide (TiO 2 ) (CTD) nanocomposite was easily prepared by photocatalytic reduction, and its structure as well as antibacterial activity in the absence of light was investigated in detail. The results show that the CTD nanocomposite exhibits good antibacterial activity even in the absence of light. The minimal inhibition concentration against Escherichia coli and Staphylococcus aureus is 21.4 μg/mL and 14.3 μg/mL, respectively, which are much lower than that of pure silver, Cu and TiO 2 nanoparticles . In addition, the enhanced antibacterial effect of the CTD nanocomposite may be explained by synergistic antibacterial effect.
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JOURNAL OF MOLECULAR STRUCTURE
·
2022
·
IF 3.841
Yuyang Wang,Yi Fang,Yaxin Gu,Kai Guo,Zhonglu Guo,Chengchun Tang
The microecology and human health threats caused by the abuse of antibiotics are increasingly serious, for which it is urgent to develop highly efficient adsorbents. In the current study, Cu modified porous boron nitride nanofibers (BNNF-Cu) with uniform distributions and stable structures were successfully synthesized. The surface area of BNNF-Cu can reach to 737.194 m 2 g −1 , which includes porous microstructure and rich surface groups. The removal performance of BNNF-Cu as an adsorbent for ofloxacin (OFL) in aqueous solution was systemically studied. Due to the addition of modifier copper, the adsorption capacities for fluoroquinolones pollutants including OFL, norfloxacin (NOR) and enrofloxacin (ENR) were greatly enhanced. The adsorption kinetic data and equilibrium adsorption isotherms are in line with the pseudo-second-order and the Freundlich models ( R 2 = 0.999), respectively, indicating that the adsorption of OFL onto BNNF-Cu was mainly multilayer chemisorption. Significantly, the adsorbent exhibits excellent removal percentage for OFL (99.74%) and the maximum adsorption capacity can reach to 305.32 mg g −1 at the pollutant concentration of 100 mg L −1 . In addition, the influences of pH, temperatures and salinity on adsorption were also further researched. The outstanding removal efficiency can be maintained after several cycles, which proves excellent reusability. Finally, the BNNF-Cu adsorbent can offer a wide range of possibilities to eliminate antibiotics efficiently in industrial wastewater.
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高影响因子
JOURNAL OF MATERIALS RESEARCH
·
2024
·Vol. 39
·期 14
·2082-2094
·
IF 2.7
Gao Chenyu,Deng Jikun,He Jiaxing,Wang Zechuan,Sheng Yuanyuan,Liu Junwu,Zhong Honghai,Tong Guoqing,Jiang Yang
A novel Cu/Ti 3 C 2 T X laminated composite foil was prepared using a combination of electroplating and electrophoretic deposition. The results indicate that the average thermal expansion coefficient of the Cu/ Ti 3 C 2 T X composite foil decreased by 11.26% compared to that of pure copper. Due to the high electron mobility of Ti 3 C 2 T X and the favorable Cu/ Ti 3 C 2 T X interface, the electrical conductivity of the Cu/ Ti 3 C 2 T X composite foil exceeded that of pure copper by 8.7%, reaching 6.2147 × 10 7 S·m −1 , and its thermal conductivity increased from 381.5 W/m·K to 423.5 W/m·K. The study revealed that a thinner, looser Ti 3 C 2 T X layer with fewer layers is more favorable for copper penetration and filling, enabling a continuous network-like structure and resulting in significantly improved thermal and electrical properties of the composite copper foil. These findings position the Cu/Ti 3 C 2 T X foil as a promising candidate for electronic encapsulation and super-conductivity. Graphical Abstract
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Caiqin Su,Defeng Hu,Hongtian Yang,Yide Han,Yufeng Liu,Ying Zhang,Xia Zhang
In this study, bi-functions of surface adsorption and laccase like catalysis were integrated by the hybrid membranes of Cu-MOF (Cu-2MI) uniformly incorporated polyvinylidene fluoride (PVDF) for the first time, which endow an unexpected utility in surface physical adsorption and chemical catalytic engineering. In which, the loading of Cu-2MI was varied to optimize the surface performance of the membranes. The adsorption conditions were optimized based on batch adsorption experiments, and the adsorption kinetics, isotherms, and thermodynamics were discussed by using theoretical models to elucidate the adsorption mechanism. In addition, the laccase-mimicking catalytic performance of these Cu-2MI/PVDF hybrid membranes was explored based on the colorimetric reaction of 2,4-dichlorophenol (2,4-DP). The laccase-like catalytic kinetics, including K m and V max , were determined, and their catalytic stability under varying pH, temperature, organic solvents, and storage time was systematically tested and compared to that of free laccase. The maximum adsorption capacity of the obtained Cu-2MI/PVDF hybrid membrane for acid fuchsin (AF) is 4789.5 μg cm −2 . Moreover, the hybrid membrane exhibits a good linear relationship in the range of 5.0–750 μM in adrenaline detection, with a detection limit of 3.60 μM. This work highlights the exceptional surface activity and stability of the Cu-MOF/PVDF hybrid membranes, which ensure promising applicability in surface physical and chemical engineering.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Jianghui Qiu,Xiafei Gao,Juan Peng
The formaldehyde oxidation reaction (FOR) with ultra-low potential is an ideal alternative to the oxygen evolution reaction (OER), significantly reducing hydrogen production energy consumption. This reaction not only generates high-value formic acid but also releases H 2 at low potential, enhancing hydrogen production efficiency and economic viability. However, developing efficient and low-cost electrocatalysts remains a key challenge. In this study, a Pt single atom on Cu nanowire catalyst shows high catalytic activity for formaldehyde oxidation reaction (FOR). The catalyst achieves a current density of 100 mA cm −2 at 0.09 V vs. RHE, with formic acid yield, selectivity, and formaldehyde conversion rate all close to 100 %. A bipolar hydrogen production system (FOR-HER) based on Pt SA -Cu NWs and Pt/C assembly achieves a current density of 100 mA cm −2 at a low cell voltage of 0.12 V, demonstrating a Faraday efficiency close to 100 % for H 2 at both the anode and cathode, and can stable operation for 30 h. Density functional theory (DFT) studies reveal that the interaction between Pt single atoms and Cu enhances hydrogen adsorption, significantly reducing the free energy of H* coupling and thereby improving hydrogen production efficiency. This study elucidates the intrinsic mechanism behind the enhanced performance, providing valuable guidance for the development of high-performance, low-cost single-atom catalysts.
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