APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Wanfeng Xiong,Duanhui Si,Jundong Yi,Yuanbiao Huang,Hongfang Li,Rong Cao
Multicomponent heterogeneous catalysts present excellent catalytic performance attributed to the synergistic effect of multi-sites. Nevertheless, identifying the composition of the multi-sites and exploring the synergistic catalytic mechanisms for the multiple active sites in electrocatalytic CO 2 reduction reaction (CO 2 RR) still lack intensive study. This work regulates the chemical composition of Cu-based nanoreactors readily by adjusting the geometrical morphology of metal-organic frameworks precursor. The obtained cuboctahedron nanoreactor containing Cu-N 4 /Cu 2 O/Cu multiple active sites exhibits excellent CO 2 RR selectivity towards deep reduction product (80%) with high current density. Moreover, the tandem catalytic mechanism of multicomponent active sites has been studied intensively. The CO 2 molecule is firstly reduced in Cu-N 4 sites to form CO and then the CO is transfered to Cu 2 O/Cu sites for further deep reduction. The high concentration of CO provided by Cu-N 4 sites decreases the free energy of rate-determining step for CH 4 products in Cu 2 O sites. This work provides a promising direction for designing and synthesizing multicomponent Cu-based tandem catalysts to access high efficiency and selectivity in the electrocatalytic CO 2 reduction reaction.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Yuanli Li,Chunqiang Zhuang,Shi Qiu,Junfeng Gao,Quan Zhou,Zaicheng Sun,Zhenhui Kang,Xiaodong Han
Metal halide perovskites with broad optical absorption and long carrier lifetime are considered as ideal photocatalysts. However, their poor stability in water greatly impedes their application in photocatalytic H 2 evolution because they lose their crystalline structure in water. Herein, we proclaim a new class of photocatalysts: all-inorganic Cs-Cu-Cl perovskite quantum dots (QDs). It exhibits a high photocatalytic hydrogen production rate of ∼ 3.1 mmol/g/h without any cocatalyst under AM 1.5-G solar irradiation (100 mW/cm 2 ). Especially, it remains the high activity for up to 330 h without apparent deterioration of the hydrogen production rate. Density functional theory (DFT) calculations reveal that the Cu site works as the electron and proton absorption sites as the H 2 production active center. To our best knowledge, there is no report of metal halide perovskites as water-stable photocatalysts. This work opens an innovative way for guiding the exploration of metal halide perovskites photocatalysts for stable photocatalytic H 2 evolution.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2025
·
IF 21.1
Zichen Song,Xinxin Zhang,Jianqiu Zhu,Xiaolei Wang,Wenqian Wang,Xiangbo Ma,Jiantao Fu,Jian-Qiang Wang,Guiling Wang,Zhiyu Ren,Honggang Fu
While copper complexes intrinsically provide Cu sites for electrocatalytic CO 2 reduction (ECR), their efficacy toward multicarbon products (C 2+ ) remains fundamentally limited by the operational instability of reactive Cu valence states and the inability to synchronously optimize *CO intermediate generation and C-C coupling within symmetric coordination environments. Herein, we judiciously design a single-crystal N, O co-coordinated copper complex (Cu(ICA) 2 ) featuring asymmetric N 2 -Cu-O 2 centers that precisely modulate the electronic structure and local adsorption environment. The Cu-N bonds stabilize partially reduced Cu δ⁺ sites while weakening Cu-O interactions, thus balancing structural integrity with catalytic reactivity. This asymmetric dual-site coordination concurrently hosts distinct *CO intermediates (atop-adsorbed *CO at Cu sites and bridge-adsorbed *CO at Cu-N sites), enabling cooperative C-C coupling into C 2 products. The catalyst achieves a record 69.2 % Faradaic efficiency for C 2 products at 400 mA cm −2 and 57.4 % for C 2 H 4 at 500 mA cm −2 in 1.0 M KOH, rivaling the state-of-the-art Cu-based complexes. In situ characterization and DFT calculations mechanistically corroborate that bridge-adsorbed *CO at Cu-N sites drives energetically favorable hydrogenation and C-C coupling pathways. This work establishes a coordination-asymmetry design principle for constructing robust molecular catalysts capable of efficient CO 2 -to-C 2+ conversion.
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Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Junfei Wu,Qin Zhang,Zhuojun He,Yingli Zhang,Yangli Chen,Hai-Bo Liu,Jing Wang
Tetracycline antibiotics (TCs) are widely distributed in the environment owing to excessive usage and incomplete metabolic breakdown, posing significant risks to ecosystems and human health. Herein, a bifunctional material, Cu-TATB-PCA, was prepared for simultaneous adsorption and detection of TCs. The material was constructed using Cu-MOF as the structural scaffold, with 1-pyrenecarboxylic acid (PCA) grafted via a postsynthetic ligand exchange (PSE) approach. The incorporated PCA moiety functions as both an active site for enhanced adsorption capacity and a fluorescent reporter for sensitive detection. Cu-TATB-PCA demonstrated a remarkable adsorption performance toward TCs, with a maximum adsorption capacity of 520.8 mg/g for oxytetracycline (OTC), 473.9 mg/g for chlortetracycline, and 469.5 mg/g for tetracycline (TC). The high adsorption capacity was mainly attributed to the dominant role of π-π interactions, which worked synergistically with coordination bonds, electrostatic interactions, and hydrogen bonds to collectively contribute to the adsorption process. In addition, Cu-TATB-PCA exhibited a highly sensitive fluorescent response toward TCs due to the mechanism of inner filter effect, which achieved a detection limit of 0.586 μM for TC and 0.776 μM for OTC. The streamlined and efficient material design paradigm paves the way for the development of bifunctional adsorption-detection materials and offers a promising avenue for future research endeavors in this field.
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JOURNAL OF POLYMERS AND THE ENVIRONMENT
·
2024
·Vol. 32
·期 7
·3326-3341
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IF 4.7
Wang Rui,Song Xin,Liu Li,Zhou Chao,Wu Guangfeng
Magnetic particles with active groups on their surfaces can be applied to wastewater purification to remove harmful ions, but the insufficient number of active groups on their surfaces tends to limit their removal rate of ions. Herein, we grafted different generations of dendritic macromolecular polyamidoamine (PAMAM) onto the magnetic chitosan microspheres (MCS) using ethylenediamine tetraacetic acid (EDTA) as core (MCEPs) for the removal of Cu (II). Firstly, 7 μm-sized MCS with good dispersibility was prepared by adjusting conditions such as glacial acetic acid content, emulsifier content and raw material ratio. Secondly, the effect of MCEPs generation, pH and contact time on the adsorption capacity were investigated. The adsorption experiments showed that the MCEPs had a high adsorption capacity, when the adsorbent was the second generation of MCEP (MCEP G2.0), the maximum adsorption capacity can up to 702.9 mg/g and the adsorption process can be completed in 60 min. Moreover, among various isotherms models, MCEP G2.0 was well-fitted by Langmuir adsorption isotherm. Also, adsorption kinetic studies proved that the adsorption mechanism of MCEP G2.0 adsorbent followed the pseudo-second-order kinetic model, demonstrating that the process was chemisorption. The adsorbent has renewability as well, after five adsorption cycles, its adsorption efficiency was still higher than 80%. Therefore, the adsorbent showed a superior adsorption capacity and renewability to remove Cu (II). Graphical
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RESEARCH ON CHEMICAL INTERMEDIATES
·
2023
·Vol. 49
·期 9
·3933-3950
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IF 3.3
Li Xiaojun,Xia Yudong,Xu Yangzhou,Li Haitao,Huang Jiangchao,Yao Jie,Zhao Heng,Gao Xinhua,Yu Jinghao,Guo Lisheng,Li Jie
Thermocatalytic conversion of redundant CO 2 to useful methanol is an attractive route to address both energy and environmental crises simultaneously. However, existing copper/oxide catalysts widely used in these thermocatalytic processes still suffer from low methanol yield under mild reaction conditions. In this work, we design inverse oxide/Cu catalysts to achieve superior thermal catalytic performance for CO 2 hydrogenation. The optimized ZnO/Cu-1.0 catalyst exhibits maximum CH 3 OH selectivity of 83.4% and space–time yield (STY) of \(170.9\;{\text{g}}_{{{\text{CH}}_{3} {\text{OH}}}} \;{\text{kg}}_{{{\text{cat}}}}^{ - 1} \;{\text{h}}^{ - 1}\) in CO 2 hydrogenation at 210 °C, nearly twofold higher STY than the previous optimal inverse ZnO/Cu catalysts ( \(89.6\;{\text{g}}_{{{\text{CH}}_{3} {\text{OH}}}} \;{\text{kg}}_{{{\text{cat}}}}^{ - 1} \;{\text{h}}^{ - 1}\) at 250 °C). Importantly, ZnO/Cu-1.0 catalyst displayed not only a satisfactory catalytic stability but also a superior CH 3 OH STY with a time-on-stream of 24 h. Such inverse configuration of catalysts will pave the way for new strategies to design high-performance thermocatalytic catalysts and promote their commercialization. Graphical abstract Typical inverse ZnO/Cu-1.0 catalysts have been demonstrated and achieved to significantly facilitate the activation of inert CO 2 molecules to produce methanol, due to its special physicochemical properties and strong ZnO–Cu interaction
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TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
·
2013
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IF 0.917
Hui LI,De-li XIAO,Hua HE,Rui LIN,Peng-li ZUO
Amino-functionalized magnetic nanoparticle (NH 2 -MNP) were prepared by a sol-gel approach. The adsorption behavior of Cu(II) ions on NH 2 -MNP was discussed systematically by batch experiments. The effects of initial Cu(II) ions concentration, time, pH and temperature were investigated. In kinetic studies, the pseudo-second-order model was successfully employed, and the pseudo-first-order model substantiated that Cu(II) adsorption on NH 2 -MNP was a diffusion-based process. Langmuir model and Dubinin-Radushkevich model ( R 2 >0.99) were more corresponded with the adsorption isotherm data of Cu(II) ions than Freundlich model. The adsorption capacity was increased with the increment of temperature and pH. NH 2 -MNP remains excellent Cu(II) recoveries after reusing five adsorption and desorption cycles, making NH 2 -MNP a promising candidate for repetitively removing heavy metal ions from environmental water samples. According to the results obtained from adsorption activation energy and thermodynamic studies, it can be inferred that the main adsorption mechanism between absorbent and Cu(II) ions is ion exchange-surface complexation.
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Journal of Materials Research and Technology-JMR&T
·
2024
·
IF 6.2
Peibo Li,Guoqiang Luo,Xiaoshan Zhang,Yi Sun,Qiang Shen
The microstructural design offers an effective strategy for overcoming the strength-ductility trade-off in Al-based composites. In this study, we demonstrate concurrent improvements in strength and ductility of Al-Cu composites by introducing heterogeneous structures, including low-angle grain boundaries (LAGBs), stacking faults (SFs), and nano-CuAl₂. A high density of LAGBs refines Al grains by absorbing dislocation into high-angle grain boundaries (HAGBs) during deformation, which helps to suppress crack propagation under plastic deformation. The absorption of dislocations by LAGBs prevents dislocation pile-up at grain boundaries, thereby reducing stress concentration. The stacking fault network formed at the heterogeneous interface between Al and CuAl₂ effectively reduces the mean free path of dislocation motion, overcoming the Hall-Petch limit in microcrystalline grains. Nano-particles further contribute to Orowan strengthening by hindering dislocation motion. The synergistic effect of these heterogeneous structures successfully evades the strength-ductility trade-off in Al-Cu composites, providing an efficient strategy by multiscale defects to facilitate maintaining plasticity in metal-matrix composites. Employing multiscale defects provides an efficient strategy to maintain plasticity in metal-matrix composites.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 6
·1-9
·
IF 2.8
liu Yulei,Qi Haichao,Liu Changfeng,Li Chao,Zhao Xinke,Hou Jingbin,Li Liangbin
Electroless plating is a promising method to achieve material surface metallization, low rupture work of plated coating and complex production processes have become important factors that restrict its progress. In this study, a facile method combined with primer modification (mixture of SiO 2 particle and resin) and electroless deposition to fabricate a high-adhesion Cu-plated coating is demonstrated. Results showed that poly(ethylene terephthalate) (PET) modified with primer could absorb Ag + through the coordination effect because hydrophilic groups (–OH and –NH 2 ) were possibly used as a bridge for chemisorbing of rare metal ions (Ag + ) through ion exchange, which acted as a catalyst for the deposition of Cu coating on its surface. More importantly, introducing SiO 2 particles in the primer can improve surface roughness, which is enhanced from 0.643 to 0.829 μm of modified coating, result in the improvement of substrate/deposited coating contact area, which would facilitate the enhancement of the adhesion behavior of plated coating. The deposition of bead-like structure Cu coating on primer-modified PET surface with a higher average roughness value possessed excellent electrical property, adhesion and crystallization. The resistivity of the copper patterns is approximately 9.81 × 10 −6 Ω·cm. It is promising to integrate this kind of metal material with excellent performance in future flexible devices.
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Analytical Methods
·
2015
·Vol. 7
·期 9
·3876-3882
·
IF 1.821
Yamei Li,Limin Zhang,Huayun Han,Xiaoli Tian,Xinxin Shi,Kai Wang,Shusheng Zhang
A new modified silica gel with alizarin complexone has been prepared and proven to act as a promising adsorbent. Ultra trace Cu(II) and Cd(II) can be selectively enriched and separated from rice and water samples by solid phase extraction and detected by FAAS. What is more, 0.003 mol L−1 and 0.25 mol L−1 of HNO3 can be used as eluent for the gradient elution of Cd(II) and Cu(II), respectively. Cu(II) could be completely separated from Cd(II) and monitored with the naked eye using color agent 5-Br-PADAP. The selectivity of the adsorbent and the effects of solution pH, type and concentration of the eluent, and foreign ions have been investigated and optimized. Under the optimized conditions, the adsorption capacity for Cu(II) and Cd(II) was 0.511 and 0.157 mmol g−1, respectively. Determination of Cu(II) and Cd(II) by FAAS was linear in the range of 1.0–200 µg L−1 and 2.5–100 µg L−1 with a detection limit of 0.21 µg L−1 and 0.46 µg L−1, respectively. Comparing the determination results for Cu(II) and Cd(II) in water and rice using the new method with those detected by ICP-MS, a considerable difference was not observed between the two methods. The method was validated with the certified reference material GBW08511 rice. Moreover, the determination of Cu(II) in the range of 20–120 µg L−1 is sensitive to the naked eye and the determination results are good in agreement with those detected by UV-Visible spectrometry. The proposed method was simple and capable of determining Cu(II) and Cd(II) in real samples accurately.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Liang Yan,Weiwei Men,Yujing Zhang,Yanqi Wu,Xuan Yang,Yilin Zhang,Chuyang Liu,Jun Liu,Feng Xu
To address the challenges of impedance mismatch and limited absorption bandwidth in ferrite-based microwave absorbers, a one-step oxygen-deficient sintering process was employed to fabricate Zn 0.35 Ni 0.65 Fe 2 O 4 /Ni-Cu multiphase composites. This approach effectively regulates Cu 2+ substitution for Ni 2+ /Zn 2+ in the ferrite lattice while modifying the Ostwald ripening process, synergistically enhancing dielectric and magnetic losses. The pure Zn 0.35 Ni 0.65 Fe 2 O 4 exhibits a broad low-frequency absorption of 5.6 GHz (3.4–9.0 GHz, covering the entire C-band). Notably, the Zn 0.35 Ni 0.65 Fe 2 O 4 /Ni-Cu composite achieves a remarkable minimum reflection loss (RL min ) of −35 dB along with an effective absorption bandwidth (EAB) of 4.7 GHz. Consequently, this work provides both a facile synthesis methodology and mechanistic insights for designing high-performance electromagnetic materials with multiband operability.
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ELECTROCHIMICA ACTA
·
2026
·
IF 5.8
Yuanxiang Zhang,Mengting Yuan,Zhen Mu,Xinchun Zhou,Tianlong Huang,Guoqiang Hu,Yang Zhang,Lingxiu Chen,Xiaolan Xue
A nonaqueous AlCl 3 CuCl/THF electrolyte is developed for Cu metal batteries. • Undissolved CuCl particles act as a Cu⁺ reservoir via dissolution equilibrium. • Dynamic Cu⁺ supply enables sustained Cu plating on passivated surfaces. • The dominant reaction pathway shifts from Cu⁺/Cu 0 to Cu 2+ / Cu 0 during cycling. • Stable Cu cycling over 1400 h is achieved at 0.5 mA cm⁻ 2 . Aqueous copper metal batteries suffer from passivation caused by a Cu 2 O layer that blocks interfacial ion transport. Here, we develop a non-aqueous electrolyte system in which tetrahydrofuran (THF) solvent is employed to suppress Cu⁺ disproportionation, while the strong Lewis acid AlCl 3 is introduced to enhance the solubility of CuCl, thereby maintaining ionic transport in the liquid phase. At the early stage of cycling, the intrinsically low solubility of CuCl leaves residual CuCl on the separator, serving as a Cu⁺ reservoir. Despite local passivation, the dissolution equilibrium continuously supplies Cu⁺, enabling sustained deposition of fresh Cu on the passivated surface. With continued cycling, incomplete stripping of Cu gradually covers passivation layer, leading to gradual restoration of the Cu electrode, thereby enabling stable cycling for over 1400 h at 0.5 mA cm⁻ 2 . Further characterization reveals that the low overpotential at the initial stage is dominated by the Cu + + e⁻ → Cu 0 pathway. In the mid-to-late cycling stages, gradual depletion of Cu⁺ increases the contribution of the Cu 2+ + 2e⁻ → Cu 0 pathway, resulting in a moderate rise in overpotential. Nevertheless, due to the dynamic reconstruction of the interfacial layer, highly reversible Cu deposition/stripping is maintained throughout cycling. This work provides new insights for the design of advanced copper-based battery electrolytes. Download: Download high-res image (245KB) Download: Download full-size image
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