JOURNAL OF SOLID STATE CHEMISTRY
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2023
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IF 3.3
Abid Hussain Shah,Zain Ul Abideen,Sumaira Maqsood,Farzana Rashid,Rafi Ullah,Attiq Ur Rehman,Muhammad Dildar,Manzoor Ahmad,Kifayat Ullah,Muhammad Numan Rafi,Fei Teng
In this study, copper based metal organic frame work (Cu-MOF) was synthesized by using different solvents i. e. H 2 O, Dimethylformamide (DMF) and DMF + C 2 H 5 OH + H 2 O solutions at various temperatures. Cu-MOF synthesized in different solvents exhibited a large number of properties and advantages including easy synthesis procedure, high porosity, good crystallinity , high surface area, massive pore volume , controllable pore surface properties (zeta potential), rigid and chemical stability. The as-synthesized Cu- MOF was analysed by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), Scanning electron microscopy (SEM), Brunauer–Emmett–Teller (BET) surface area, zeta potential , electrostatic attraction and Thermal gravimetric analysis (TGA). A higher BET surface area of 121.1 m 2 g −1 was obtained for Cu-MOF synthesized in DMF + C 2 H 5 OH + H 2 O compared with H 2 O (109.3 m 2 g −1 ) and DMF (115.1 m 2 g −1 ) solvents. The as-obtained Cu-MOF was used to investigate adsorption kinetic performances of methylene blue (MB) and methyl orange (MO) dye molecules. Compared with other samples, Cu-MOF synthesized in (DMF + C 2 H 5 OH + H 2 O) has a significantly enhanced adsorption ability for MB but a lower for MO dyes. After 4 min, the adsorption co-efficient ( k) values were calculated to be 0.506, 0.846 and 1.1915 min −1 for MB and 0.029, 0.024 and 0.005 min −1 for MO dyes for Cu-MOF (H 2 O), Cu-MOF (DMF) and Cu-MOF (DMF + C 2 H 5 OH + H 2 O), respectively. It was found that Cu-MOF has a higher adsorption for MB dye but a poor adsorption capacity for MO, which was attributed to the electrostatic attraction/repulsion phenomena. Moreover, compared with Cu-MOF (DMF) and Cu-MOF (H 2 O), Cu-MOF (DMF + C 2 H 5 OH + H 2 O) shows an improved stability at 370, 417 and 423 °C temperatures. The result obtained through experiment suggested that porous Cu-MOF microstructures synthesized in DMF + C 2 H 5 OH + H 2 O have potential application for the treatment wastewaters having MB and MO dyes.
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APPLIED SURFACE SCIENCE
·
2023
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IF 6.7
Menglin Li,Xinpeng Wang,Jian Zhang,Yonghao Gao,Wen Zhang
The capture of toxic radioiodine is an increasingly important priority for the safe development of nuclear energy. Copper is a promising alternative for expensive silver to capture iodine. To develop novel copper-based adsorbents and determine the effect of copper species on iodine adsorption, the metal–organic framework with dual-pyrazole ligands (MOF-303) is employed as the scaffold to bind Cu 2+ species. Cu 0 nanoparticles were formed after the reduction by NaBH 4 . The obtained Cu 2+ -MOF-303 and Cu 0 -MOF-303 show high iodine uptake capacities at 353 K, 747 mg·g −1 and 837 mg·g −1 , respectively. They also show high iodine uptake capacities of more than 300 mg·g −1 at a high temperature (423 K), which are better than other Cu-based adsorbents. Besides, the loading of Cu can enhance the iodine selectivity under humid vapor, and iodine adsorption rate in iodine-cyclohexane solutions. The Cu 0 on Cu 0 -MOF-303 can react with iodine directly via the redox mechanism. For Cu 2+ -MOF-303, the adjacent pyrazole ligands can chelate with Cu 2+ ions strongly and transfer charges to trapped iodine to form polyiodide anions, and thus stable CuI species could also be generated. The strategy of anchoring Cu species using MOF-303 provides large channels for iodine diffusion, and highly-dispersed Cu and N sites for iodine capture.
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ANALYTICAL CHEMISTRY
·
2019
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IF 6.35
Li Fu,Bin Zhang,Xiaoyan Long,Kena Fu,Xuwen Gao,Guizheng Zou
Screening a novel electrochemiluminescence (ECL) system is crucial to ECL evolution. Herein, an efficient ECL system with less interference and environmental concern under physiological condition is developed via a unique internal Cu(I)/Cu(II) couple cycling amplified strategy by employing the glutathione- and citrate-capped copper indium sulfide (CIS)/ZnS nanocrystals (NCs) as electrochemiluminophore and N2H4·H2O as co-reactant. CIS/ZnS NCs can be electrochemically injected with valence band (VB) hole at 0.46 and 0.87 V (vs Ag/AgCl), and then achieve the same hole-injected states by relocalizing VB holes with the Cu(I) species inside of CIS/ZnS NCs to form internal Cu(II) defects, while each N2H4·H2O molecule can be successively oxidized to two more reducing species N2H3• and N2H2 around 0.10 V, and inject conduction band (CB) electron onto CIS/ZnS NCs for triple times. The internal Cu(I)/Cu(II) couple cycling involved radiative-charge recombination between these VB hole and CB electron eventually enables two efficient near-infrared ECL processes (around 731 nm) at 0.55 and 0.87 V, in which each single nanocrystal may participate in multiple ECL reaction cycles to produce multiple photons for amplified ECL, similar to the tris(bipyridyl)ruthenium(III) based ECL system. The low-triggering-potential ECL process at 0.55 V can be utilized to selectively determine Cu(II) with a wide linear range from 10 and 1500 nM and a limit of detection of 5 nM (S/N = 3). This work presents a NCs engineering and co-reactant selecting combined strategy for further ECL evolution.
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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.
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APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Xiaocun Wang,Shuo Han,Fei Xiao
With the maximum operating temperature of semiconductor devices becomes higher, novel die attach methods for high temperature application are required. Cu–Cu direct bonding provides a simple solution that eliminates the use of die attach materials and the related reliability issues. However, the easy oxidation of copper is the main obstacle for Cu–Cu direct bonding. In this study, a simple and efficient method for Cu–Cu direct bonding in minutes at low pressure and low temperature in air without complex pre-treatment was developed. The problem of copper oxidation was solved by rapid in-situ reduction and temporary passivation of glycerol. The bonded samples show very high shear strength. The surface leveling effect of the glycerol reduction was verified, which is beneficial for bonding. The bonded samples showed little change in shear strength after 1000 h of aging at 250 °C in air, demonstrating a long-term high temperature service capability. This new bonding method has great potential in power devices packaging and flip chip bonding.
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Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Jinghui Wang,Chengyu Wang,Yuhang Zhang,Zhijun Luo,Lingling Qu
A heat-activated sodium percarbonate and persulfate (heat-SPC-PS) system was employed to treat Cu(II)-EDTA wastewater effectively. In this binary-oxidant system, SPC functioned as an oxidant, precipitant, and neutralizer throughout the treatment process. Under optimized conditions (SPC dosage: 28.3 mM, PS dosage: 47.0 mM, temperature: 80 °C), the system achieved a Cu removal efficiency of 95.9 % and rate constant of 0.391 min −1 after 10 minutes of treating a 3.14 mM of Cu(II)-EDTA solution. The Cu ions released from Cu(II)-EDTA were precipitated as a mixture of CuO, CuCO₃, and Cu₂(OH)₂CO₃. Additionally, SPC neutralized the H⁺ ions generated from PS hydrolysis, yielding a final solution pH of approximately 7.86. When followed by an alkali precipitation (AP) step at pH 11, the combined heat-SPC-PS + AP process further increased Cu removal efficiency from 95.9 % to 98.4 %, with precipitation occurring as CuO. Reactive oxygen species (ROS) generated by heat-SPC-PS system, including OH • , SO 4 •- , O 2 •- , and 1 O 2 were key contributors to the decomplexation of Cu(II)-EDTA. Moreover, the treatment substantially reduced phytotoxicity of Cu(II)-EDTA solutions. Lettuce grown with the treated effluent exhibited growth indices comparable to those irrigated with deionized water, demonstrating the potential of the heat-SPC-PS system for the safe and effective treatment of heavy metal complexes in wastewater.
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Sustainable Energy & Fuels
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2024
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IF 5
Yuting Wu,Keru Cao,Jun Yan,Yuheng Zhang,Biao Zhang,Yanan Wang,Yong Yang,Dacheng Zhou,Qi Wang,ChunXia Liu
Electrochemical detection techniques are unable to accurately distinguish isomers with similar structures and properties due to the poor stability and selectivity of some sensors and their susceptibility to environmental interference. Bimetallic synergistically synthesized MOF materials have various types of highly ordered pores and can be used as adsorbent materials and catalyst carriers. Therefore, a composite material was developed to prepare its derivative Cu/Bi@C using a bimetallic organic skeleton (Cu/Bi-MOF) as a precursor, inheriting the large number of active sites on the surface of the MOF and large surface area, while improving the electrochemical response signal. The morphology and structure of the synthesized Cu/Bi@C composites were tested and analyzed by XRD, SEM and other characterization methods, and the electrochemical response of the Cu/Bi@C nanocomposites was analyzed by using an electrochemical workstation. In this study, a simple and highly selective electrochemical method was developed for the simultaneous determination of catechol and catechol quinone. Differential pulse voltammetry (DPV) was used for the simultaneous detection of HQ and CC. The results showed that the Cu/Bi@C electrode was able to efficiently and highly selectively detect both isomers. The Cu/Bi@C electrode could detect HQ and CC in the range of 2–600 μM and 2–800 μM, respectively, under the detection environment of pH = 6.0. The detection limits were 0.08 μM and 0.11 μM (S/N = 3), respectively. The sensor was successfully applied to real samples and showed low detection limits, good recoveries, high selectivity, stability and reproducibility. This provides a new idea for electrochemical detection and is expected to be applied in several fields.
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Nature Communications
·
2024
·Vol. 15
·期 1
·1-10
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IF 14.7
Fan Yamei,Li Rongtan,Wang Beibei,Feng Xiaohui,Du Xiangze,Liu Chengxiang,Wang Fei,Liu Conghui,Dong Cui,Ning Yanxiao,Mu Rentao,Fu Qiang
Sintering of active metal species often happens during catalytic reactions, which requires redispersion in a reactive atmosphere at elevated temperatures to recover the activity. Herein, we report a simple method to redisperse sintered Cu catalysts via O 2 -H 2 O treatment at room temperature. In-situ spectroscopic characterizations reveal that H 2 O induces the formation of hydroxylated Cu species in humid O 2 , pushing surface diffusion of Cu atoms at room temperature. Further, surface OH groups formed on most hydroxylable support surfaces such as γ-Al 2 O 3 , SiO 2 , and CeO 2 in the humid atmosphere help to pull the mobile Cu species and enhance Cu redispersion. Both pushing and pulling effects of gaseous H 2 O promote the structural transformation of Cu aggregates into highly dispersed Cu species at room temperature, which exhibit enhanced activity in reverse water gas shift and preferential oxidation of carbon monoxide reactions. These findings highlight the important role of H 2 O in the dynamic structure evolution of supported metal nanocatalysts and lay the foundation for the regeneration of sintered catalysts under mild conditions.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2025
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IF 9.7
Man Zhao,Wei Wen,Chunmei Liu,Qinyun Yan,Shuai He,He Xiao,Li Zhang,Junming Zhang,Xiaofeng Gao,Jianfeng Jia
The electrochemical CO 2 reduction reaction (CO 2 RR) to multi‑carbon products offers a promising route for sustainable fuel production, yet achieving high selectivity remains challenging due to the complex interplay between catalyst structure and reaction pathways. Here, we report a rational design of Cu-Cu 2 O/graphene (Cu/G) composites with tunable Cu + /Cu 0 ratios via electrolyte-mediated electrochemical synthesis. By varying tetraalkylammonium/phosphonium electrolytes (TBABF 4 , TBAPF 6 , TBACF 3 SO 3 , TBPBF 4 ), we precisely control Cu oxidation states, as validated by the results of X-ray absorption fine structure (XAFS), X-ray diffraction (XRD), and high-resolution transmission electron microscope (HRTEM). In-situ Fourier transform infrared (In-situ FTIR) spectra and in-situ Raman spectra indicate Cu + -rich surfaces (Cu/G-TBABF 4 ) favor the production of formate via O-bound intermediates, while Cu 0 -dominated interfaces (Cu/G-TBAPF 6 ) promote the formation of CO through C-bound pathways. Mixed Cu + /Cu 0 systems (Cu/G-TBACF 3 SO 3 , Cu/G-TBPBF 4 ) enable C C coupling, with ethylene (FE = 28 %) and ethanol (FE = 30.2 %) selectivity governed by the Cu + /Cu 0 balance. Ultraviolet photoelectron spectroscopy (UPS) results reveal that lower work functions enhance *CO coverage and stabilize C 2+ intermediates, elucidating the electronic structure-activity relationship. This work demonstrates electrolyte-mediated oxidation state engineering as a versatile strategy to steer CO 2 RR pathways, offering a generalizable approach for designing multi-valent electrocatalysts with tailored selectivity.
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Journal of Materials Research and Technology-JMR&T
·
2025
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IF 6.6
Xinru Gong,Haohao Zou,Huadong Ye,Weiwei Zhu,Ying Han,Zhenxin Duan,Suqiu Jia,Xu Ran
In this study, copper (Cu) nanoparticles (NPs)-modified Ti 3 C 2 T x MXene nanosheets (Ti 3 C 2 T x @Cu) were synthesized via chemical reduction. Subsequently, Ti 3 C 2 T x @Cu/Cu composite powder was synthesized via low-energy ball milling, followed by rapid hot pressing to fabricate Ti 3 C 2 T x @Cu/Cu composites. The influence of Ti 3 C 2 T x @Cu content on the microstructure, mechanical properties, and tribological performance of Ti 3 C 2 T x @Cu/Cu composites was systematically investigated. With increasing Ti 3 C 2 T x @Cu content (0–10 vol%), the Brinell hardness of the composites gradually increased, while the tensile strength showed an initial increase to a maximum of 311.59 MPa at 3 vol%, and then gradually decreased. The main reason for this improvement was the enhancement effect of Ti 3 C 2 T x @Cu. Moreover, Ti 3 C 2 T x @Cu effectively enhanced the tribological performance of the Cu matrix, attributed to the synergistic effect of Ti 3 C 2 T x MXene nanosheets and Cu NPs. These components could get adsorbed onto the surface of the friction pairs and induce tribochemical reactions, resulting in the formation of Fe 2 O 3 and CuO. Consequently, a stable protective film composed of Fe 2 O 3 /CuO/Ti 3 C 2 T x MXene was formed on the worn surface, thereby reducing friction.
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JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
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2025
·
IF 7.5
Xiuqi Wang,Zheng Lian,Dashi Lu,Mingyu Li,Hongjun Ji
The application of nanoparticle sintering technology for third-generation semiconductor packaging is usually hindered by the difficulty in volatilization of organic vehicles, the nanoparticle (NP) agglomeration of its solder paste zone, and poor mechanical properties due to the inherent pores/cracks. In this work, these obstacles can be overcome using ultrasonic-spraying Cu NP film and vacuum thermal-pressure sintering. This work first controlled the ultrasonic spraying process parameters (power, flow, pressure) to achieve uniform and stable atomization effects yielding a homogeneous Cu NP film. The Cu NP film was further employed to realize Cu die-Cu substrate interconnection, and the microstructure and mechanical properties of the sintering joints was emphatically analyzed. Results demonstrate that near-monolayer fine Cu sintering structures are successfully produced. The sintering joints have good interfacial bonding ratio (∼ 94 %) and low porosity (∼ 1.6 %), resulting in shear strengths of up to 120.1 MPa. Even when sintering at 250 °C, the shear strength can reach 96.1 MPa. Because of the "contact activation effect" and the removal of interfacial cracks , these ultrasonic-spraying samples are stronger than printing sintering joints (with cracks) under the same sintering processes . We expect this approach to improve the performance of the sintering joints and broaden the application of Cu NP films, the microstructure of which less dependent on paste composition and sintering procedure (temperature, pressure, and time, etc.).
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ACS Sustainable Chemistry & Engineering
·
2018
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IF 6.14
Junhui Liu,Anfeng Zhang,Xiao Jiang,Min Liu,Yanwei Sun,Chunshan Song,Xinwen Guo
Conversion of CO2 to sustainable chemical feedstocks and fuels by reacting with renewable hydrogen is considered to be a promising direction in energy research. The selectivity of desired products, such as C2–C4= and C5+, is low over unpromoted iron-based catalysts for CO2 hydrogenation. Therefore, promoters are often used to tailor and optimize the product distribution. In this work, the effect of doping Cu into Fe-based supported catalysts on the catalytic performance for CO2 hydrogenation to hydrocarbons was studied with a particularly focus on the interaction between Fe and Cu. For this purpose, catalysts with different Fe and Cu distribution were prepared by various impregnation methods. It was found that the selectivity of C2–C4= over Cu-promoted catalysts decreased, but a significant improvement was obtained for C5+. This promoting behavior is different from that of other promoters (e.g., K, Mn, Zn, etc.). The secondary conversion of produced olefins on Cu-promoted catalysts, which results from the improvement of olefins adsorption, on Cu-promoted catalysts leads to the decrease of C2–C4= (hydrogenation) but the increase of C5+ (oligomerization). Characterization results demonstrate that the catalytic performance is evidently associated with the strength of the interaction between Fe and Cu in the supported catalysts.
研究领域:
催化化学
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能源研究
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化学工程
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可持续化学
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