SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Penghai Wei,Yali Zhang,Yaoguo Huang,Yun Jia,Linlin Chen,Ming Wang
Cyanide wastewater contains highly toxic substances such as cyanide and metals. A simple and efficient photoelectro-catalytic oxidation method was proposed. Effect and mechanism of cyanide degradation and Cu/Zn recovery by photoelectro-catalytic oxidation were investigated. The experimental results show the degradation efficiency of total cyanide and removal efficiencies of copper and zinc reached 96.90%, 99.76% and 90.56%, respectively, under the optimum conditions of 2.5 V external bias voltage and 4.0 h with air and lighting. An external electric field can significantly improve the migration and separation of photo-generated electrons ( e – ) and holes ( h + ), thereby increasing the photocatalytic efficiency. Simultaneously, the surface potential of semiconductor is lower than the body under the action of bias voltage and leads to energy band bending. XPS analysis indicates that cyanide is finally degraded into carbon oxide and nitrogen. Cu and Zn are mainly recovered as elementary substance.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Mingxuan Fu,Guyang Ning,Jiaxian Liu,Qi Zhang,Yuena Sun,Xinyu Fan,Haiyang Wang,Haijun Lu,Yufan Zhang,Huan Wang
What is essential to solving energy scarcity problems is that develop the high activity, durable and non-noble metal-based dual-functional electrocatalysts for hydrogen evolution reactions (HER) and oxygen evolution reactions (OER). In this work, a series of core-shell structure M@Fe–Cu-GR nanocubes (NCs) are prepared. In the prepared process, the bimetallic FeCu prussian blue analogues (PBA) is used as precursor, transition metals ions Co 2+ and Ni 2+ are introduced into the FeCu-PBA using the exchange of potassium ions with other metal ions , and then the FeCu-PBA are successfully loaded on the graphene oxide (GO) employed the attraction of opposite charges between polydiallyldimethylammonium chloride (PDDA) and GO. Electrochemical tests show that the Tafel slope of Co–Ni@Fe–Cu–GR NCs for HER and OER are 60 and 82 mV dec −1 , respectively, and Co–Ni@Fe–Cu–GR NCs shows excellent performance in long-term stability test.
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Journal of Chemistry
·
2020
·Vol. 2020
·期 1
·5496712
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IF 1.79
Yingying Zhao,Linchuan Zhan,Zhongjun Xue,Kianpoor Kalkhajeh Yusef,Hongxiang Hu,Mengjun Wu
Natural macromolecule adsorbing materials are alternatives for remediation of heavy metals’ polluted waters. In this study, sodium alginate composite gel (SACL) was synthesized from sodium alginate (SA), polyethylene glycol oxide (PEO), and nanomaterials to remove wastewater Cu (II) and Cd (II). The adsorption efficiency of SACL was analysed in relation to the contact time, initial concentrations of metal ions, temperature, adsorbent dosage, and solution pH. Three models, i.e., kinetic model, isothermal adsorption model, and thermodynamic model, were used to fit the experimental data. Our results showed that the highest removal rates of Cu (II) and Cd (II) from wastewater were 96.8% and 78%, respectively, under the condition of the best liquid-solid ratio of 12.5 ml·g −1 , and the contact time of 180 min (25°C). Overall, the SACL adsorption of Cu (II) and Cd (II) was spontaneous. The adsorption kinetics and the isothermal adsorption were fitted well with the pseudo-second-order kinetic equation and Langmuir equation, respectively. Combined with SEM-EDS and FTIR analysis, results suggested that SACL adsorbs wastewater Cu (II) and Cd (II) mainly through chemical reaction on its surface area. Altogether, this work concludes on SACL as an efficient and ecofriendly adsorbent for wastewater Cu (II) and Cd (II).
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高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2021
·Vol. 168
·期 11
·110546
·
IF 4.316
Guangjie Yang,Mengmeng Cui,Tao Han,Dong Fang,Xingjie Lu,Sui Peng,Olim Ruzimuradov,Jianhong Yi
Sodium vanadate have been widely used as a lithium-ion battery anode. However, its further application is restricted by the capacity attenuation during cycles because of its easy solubility in electrolyte, huge structural change, and low conductivity. Here, a lithium-ion battery electrode based on Cu-Cu2O coated Na5V12O32 nanowire arrays using a predischarge-electrodeposition method is freported. Remarkably, in the Cu-Cu2O@Na5V12O32 electrode, the Na5V12O32 nanowires function as the skeleton, and Cu-Cu2O nanoparticles function as the coating layer. At a specific current of 50 mA g−1, the composite electrode exhibits discharge and charge capacity of 837 and 821 mAh g−1 after 80 cycles, respectively, which is much higher than that of the Na5V12O32 nanowires electrode. This research provides a new pathway to explore electrode materials with enhanced electrochemical performance.
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高影响因子
Science Bulletin
·
2020
·
IF 9.511
Linbao Guo,Jiangjian Shi,Qing Yu,Biwen Duan,Xiao Xu,Jiazheng Zhou,Jionghua Wu,Yusheng Li,Dongmei Li,Huijue Wu,Yanhong Luo,Qingbo Meng
Aqueous precursors provide an alluring approach for low-cost and environmentally friendly production of earth-abundant Cu 2 ZnSn(S, Se) 4 (CZTSSe) solar cells. The key is to find an appropriate molecular agent to prepare a stable solution and optimize the coordination structure to facilitate the subsequent crystallization process . Herein, we introduce thioglycolic acid (TGA), which possesses strong coordination (SH) and hydrophilic (COOH) groups, as the agent and use deprotonation to regulate the coordination competition within the aqueous solution. Ultimately, metal cations are adequately coordinated with thiolate anions , and carboxylate anions are released to become hydrated to form an ultrastable aqueous solution. These factors have contributed to achieving CZTSSe solar cells with an efficiency as high as 12.3% (a certified efficiency of 12.0%) and providing an extremely wide time window for precursor storage and usage. This work represents significant progress in the non-toxic solution fabrication of CZTSSe solar cells and holds great potential for the development of CZTSSe and other metal sulfide solar cells.
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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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高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2023
·Vol. 49
·期 9
·3933-3950
·
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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高影响因子
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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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·Vol. 107
·期 9
·6439-6455
·
IF 3.5
Liangliang Tang,Dongxu Yao,Yongfeng Xia,Jun Zhao,Ming Zhu,Yu-Ping Zeng
Complex liquid–solid reactions occur during brazing. A deep understanding of brazing liquid evolution is therefore of important concern for the bonding between filler and substrates. The joining of gas-pressure-sintered silicon nitride (Si 3 N 4 ) ceramic to oxygen-free copper (OFC) foil was prepared using Ag–Cu–TiH 2 filler at 875°C for 0.5 h. The effect of the Ag:Cu ratio on the interfacial microstructure and peeling strength of the joints was analyzed. The reaction of brazing liquid with Si 3 N 4 ceramic includes reactions with both the β-Si 3 N 4 and the grain boundary phases (Y–Si–Mg–O–N). The resulting interfacial reaction products include TiN, Ti 5 Si 3 , and potential Cu 3 Ti 3 O. Based on the phase composition and three-dimensional morphology of the interfacial reaction products in the Si 3 N 4 ceramic/OFC foil joints, a model for the evolution of the brazing liquid as the reaction proceeds was proposed. Peeling test results indicated that the peeling strength of the joints rises unilaterally with the increase of the Ag:Cu ratio in the filler until reaching the peak value of 24.3 N/mm at the maximum Ag:Cu ratio of 90:10. The mechanisms of the joint peeling fracture were discussed in detail.
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Current Analytical Chemistry
·
2024
·Vol. 21
·期 7
·877-883
·
IF 1.7
Yong Zhang,Qianmin Cong,Chenxu Feng,Zhengyu Cai,Lizhai Pei
BackgroundCyanide is a toxic anion and may be discarded into the water environment, which is a serious threat to human beings and the environment. Hence, it is essential to explore a facile, sensitive method for cyanide detection. Polyaniline/Cu-vanadate nanobelts serve as electrode materials for sensitive cyanide determination.MethodsPolyaniline/Cu-vanadate nanobelts were obtained by a simple route using polyaniline, Cu-vanadate nanobelts. The polyaniline/Cu-vanadate nanobelts were measured via electron microscopy, diffraction, infrared spectrum, and electrochemical methods.ResultsAmorphous polyaniline nanoparticles with a particle size of about 100 nm were attached firmly to the surface of Cu-vanadate nanobelts. Electrochemical sensing properties for cyanide detection were analyzed using a cyclic voltammetry technique using the nanobelts-modified electrode. The cyclic voltammograms (CV) peaks centered at +0.64 V and +0.54 V were observed using the polyaniline/Cu-vanadate nanobelts in 0.1 M KCl solution with 2 mM cyanide. The proposed composite nanobelt-modified electrode possessed the detection range and detection limit of 0.001-2 mM and 0.22 μM, respectively.ConclusionPolyaniline greatly enhances the electro-catalytic performance of the Cu-vanadate nanobelt-modified electrode for cyanide detection.
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Advanced Science
·
2025
·
IF 14.1
Chaomin Duan,Meng Wang,Yan Zhang,Zhihua Lian,Wenpo Shan
Ammonia (NH 3 ) emissions adversely affect both the environment and human health. The selective catalytic oxidation of NH 3 (NH 3 -SCO) holds great promise for NH 3 abatement; however, there remains a lack of cost-effective NH 3 -SCO catalysts with high activity and N 2 selectivity for practical applications. This study reports on a strategy for constructing an outstanding NH 3 oxidation catalyst via the in situ doping of Cu into CeO 2 nanorods. The designed CeCuO x nanorod catalyst shows remarkable activity, N 2 selectivity, and stability for NH 3 oxidation, achieving complete conversion below 250 °C, with ≈80% N 2 selectivity. The results of various characterization tests and density functional theory (DFT) calculations show that the addition of Cu induces the formation of abundant Cu + -O v -Ce 3+ active sites on the CeO 2 , which are beneficial for the adsorption and activation of reactants. Additionally, in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) confirms that the addition of Cu switches the primary intermediate species of NH 3 oxidation from bidentate nitrate species to monodentate nitrate species, which accelerates the rate-determining step of NH 3 -to-N 2 oxidation. Therefore, doping Cu into CeO 2 greatly improves its NH 3 oxidation activity and N 2 selectivity. This study provides valuable insights into the construction of highly active sites for NH 3 oxidation.
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DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2025
·
IF 11.3
Yanjun Wang,Yuancai Lv,Yifan Liu,Minghua Liu
The electrochemical reduction of nitrate for ammonia production is recognized as a viable method to support a sustainable artificial nitrogen cycle. Extensive research has been focused on enhancing the performance and selectivity of electrocatalysts for NO 3 - RR (nitrate reduction reaction). In this study, we show that modifying the surface oxygen species via thermal treatment and dispersant addition is an effective way to improve the NO 3 - RR performance of Cu 2 O/CF. Using advanced spectroscopic methods, we show that thermal treatment and dispersant addition can greatly boost the generation of oxygen vacancies and hydroxyl groups on the surface of Cu 2 O/CF. Electrocatalytic reaction rate experiment, in-situ FT-IR, DEMS analyses and DFT calculations further suggest that oxygen vacancies on the Cu 2 O/CF surface promote the adsorption and conversion of nitrate and its intermediate, nitrite. Meanwhile, hydroxyl groups promoted the selective hydrogenation of NO to NH 3 . Our findings highlight the essential role of surface oxygen species in NO 3 - RR and provide a foundation for designing advanced electrocatalysts through surface engineering approaches.
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