METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
·
2019
·Vol. 50
·期 10
·4827-4838
·
IF 1.985
Liu Jun-Kai,Zhang Guo-Hua,Sun Guo-Dong
We propose a process to produce ultrafine W-10 wt pct Cu composite powders by reducing the mixtures of copper tungstate (CuWO 4 ) and tungsten trioxide (WO 3 ) (from the calcination of a mixture of ammonium paratungstate and copper nitrate trihydrate) with carbon black and hydrogen. First, ultrafine pre-reduced tungsten-copper (W-Cu) powders containing a small amount of WO 2 were produced by reducing mixtures of CuWO 4 and WO 3 with insufficient carbon black; then the obtained products were further reduced by hydrogen to remove the residual oxygen. This method provides a simple and low-cost route to prepare ultrafine W-10 wt pct Cu composite powders. The composite powders were sintered at different temperatures [1323 K (1050 °C), 1373 K (1100 °C), 1423 K (1150 °C), 1473 K (1200 °C), and 1523 K (1250 °C)] for 3 hours. A maximum densification of the obtained compact was achieved at a sintering temperature of 1523 K (1250 °C), with a relative density, Vickers hardness and thermal conductivity of the W-10 wt pct Cu composites of 97.8 pct, 365 HV and 165 W/m K, respectively.
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ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Xiangfu Meng,Guoxing Pan,Hongji Liu,Yong Qian,Xingyu Wang,Changlai Wang,Lin Hu,Hui Wang,Qianwang Chen
The electroreduction of carbon dioxide (CO2) to a liquid product is a viable method for establishing an artificial carbon cycle. Unfortunately, most electrocatalysts’ low efficiency and instability prevent them from being used in practical applications. In the current study, we developed ultrasmall Cu nanocrystals embedded in nitrogen-doped carbon nanosheets (Cu/NC-NSs) for selective CO2 electroreduction by adjusting the potential. Cu/NC-NSs had 43.7 and 63.5% Faradaic efficiencies for the synthesis of ethanol and formate with applied potentials of −0.37 and −0.77 V vs reversible hydrogen electrode (RHE) using a flow cell architecture, respectively. Moreover, these Cu/NC-NSs show a steady catalytic performance up to 16 h. Density functional theory (DFT) calculations were performed to investigate the reaction mechanism. Furthermore, the synergistic effect formed by nitrogen-doped carbon and highly dispersed copper atoms led to their excellent performance in CO2 electroreduction.
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MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Lulu Cui,Weijie Shi,Houshen Li,Xiuxian Zhao,Shiyun Ai,Xiangju Meng,Shuhong Sun,Zeyi Guo
For bimetallic nanozymes, the closeness between the two elements is closely related to their properties, but achieving tight contact between the two components still faces challenges. Herein, copper was introduced by the coordination effect between the organic ligand in Ce-MOF and Cu 2+ , then a series of Cu-CeO 2 nanozymes were obtained by thermal treatment. The content of copper can be easily controlled and the spindle-shaped structure assembled by multilayer flakes can be obtained. The total antioxidant capacity (TAC) detection program based on the excellent peroxidase (POD)-like activity of the as-prepared Cu-CeO 2 nanozyme showed a wide linear detection range and ideal detection limits for ascorbic acid (AA), glutathione (GSH), Trolox and cysteine (Cys). More importantly, this method can be applied in TAC detection of commercial samples. This work provided a method for the design of high performance bimetallic nanozymes and developed a sensor that can be applied to detect TAC in vitamin C tablets and beverages.
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FOOD CONTROL
·
2024
·
IF 5.6
Siying Che,Gaoqiong Deng,Tingyong Ling,Haiyan Fu,Yuanbin She
Monosultap (Mon) poses significant environmental and human health risks due to its widespread and irregular use. However, due to the lack of intrinsic fluorophores and identifiable sites in monosultap, there were few fluorescence analytical methods achieved sensitive detection of monosultap. Hence, we present a BSA-Cu nanocluster-based turn-off-on fluorescent sensor for sensitive detection of monosultap. The sensor exhibits fluorescence quenching ("turn-off") in the presence of DTAB-CuTPyP. The competitive binding of monosultap with DTAB-CuTPyP switches the sensor to the "turn-on" state. Under optimized conditions, the sensor demonstrates a linear response to monosultap concentrations ranging from 0.33 × 10⁻ 2 to 3.33 × 10⁻ 2 mg/kg, with a detection limit of 0.098 mg/kg, which is below the permissible exposure limit (approximately 1 mg/kg). In addition, the co-existence of nine interference pesticides does not affect the sensor's ability to detect monosultap. This fluorescence restoration mechanism enables sensitive monosultap detection and provides a guide for detecting trace pesticides in food.
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MOLECULES
·
2025
·Vol. 30
·期 2
·225
·
IF 4.6
Jieqiong Wang,Jingyi Yang,Zezheng Bing,Yuanyuan Gao,Tao Yang,Qiaoyun Liu,Meng Zhang,Zhongyi Liu
Controllable hydrogenation of carbonyl groups (C=O) is crucial for converting furfural into high-value furfuryl alcohol. Instead of traditional impregnation method, a novel Cu-based catalyst (Cu/SiO2) is prepared using the ammonia evaporation method (AE) for the efficient hydrogenation of furfural to furfuryl alcohol under mild conditions. At the reaction conditions of 90 °C and 1 MPa H2, the 5Cu/SiO2-AE sample showed optimal performance with higher turnover frequency (36.0 h−1) and furfuryl alcohol selectivity (>99.9%). After five cycles, the catalyst recycled still showed a high reaction activity and selectivity for furfuryl alcohol. Characterization results such as XRD, H2-TPR, FT-IR, and XPS showed that the excellent catalytic performance of 5Cu/SiO2-AE catalyst was attributed to the formation of layered copper silicate and the high dispersion of Cu species. Furthermore, the formation of layered copper silicate resulted in a higher ratio of Cu+/(Cu0+Cu+) at a reduction temperature of 250 °C, which was also responsible for the optimum activity. This work showed the importance of controllable synthesis of layered copper silicate in improving the catalytic performance of copper-containing catalyst.
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PubMed
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ChemCatChem
·
2024
·
IF 3.8
Pengchao Ren,Zhenzhou Zhang,Tingting Hu,Zhihui Fan,Shanshan Dang,Sifan Cheng,Weifeng Tu,Yi-Fan Han
Graphical The apparent rate coefficients for CH 3 OH synthesis from CO hydrogenation are a single-valued function of the CO 2 -to-CO ratio in the contacting gas phase, because this ratio determines the extent of surface oxidation of Ce 2 O 3 to CeO 2 , the relative abundance of surface Ce 3+ , and in turn the density of Cu 0 -Ce 3+ sites pair on the working Cu/CeO 2 catalyst. This study investigated the dynamic structure of a working Cu/CeO 2 catalyst and its catalytic consequences for CH 3 OH synthesis via CO hydrogenation by kinetics, high-precise chemical titration, and a series of in situ X-ray spectroscopies. We have revealed that the apparent rate coefficients for CH 3 OH synthesis from CO hydrogenation are a single-valued function of the CO 2 -to-CO ratio in the contacting gas phase. This ratio determines the extent of surface oxidation of Ce 2 O 3 to CeO 2 , the relative abundance of surface Ce 3+ and Ce 4+ sites, and in turn, the density of Cu 0 -Ce 3+ sites pair on the working Cu/CeO 2 catalyst, although the chemical state of Cu and elemental distribution of both Cu and Ce were insensitive to the ratio. The reactivity of CH 3 OH formation and the Cu 0 -Ce 3+ sites decrease monotonously with an increase in the CO 2 -to-CO ratio. The direct connection of the reactivity and the oxidant-to-reductant ratio appears to be general for heterogeneous catalysis, for which the oxidant oxidizes metal atoms. In contrast, the reductant scavenges surface oxygen atoms, thus dictating the density of surface sites and their thermodynamic activities.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Bibo Ma,Miaomiao Peng,Suqin Zhang,Qingqiang Zhou,Lin Wang,Yumei Zhang,Qingzhi Luo,Jing An,Huiying Mu,Huaiyu Zhang,Zhi Li,Xiaofei Yin,Yandong Duan,Desong Wang
Nonprecious transition metal copper-based catalysts have attracted immense research interest for several applications due to their cost-effectiveness. However, deactivation by agglomeration in high-temperature environments remains a pervasive challenge and limits their uses. Here, we show the controllable dispersion of ultrafine copper nanocomposites among the linear polyimide by a strong CuO x /WO x (WCuO x ) heterostructure coupling. The strong interaction triggered by coupling-confinement confines the mobility of Cu species, preventing the agglomeration or the formation of large metal particles. Abundantly exposed catalytic sites with unique electronic structures optimized the adsorption activation of H 2 O and the reaction energy barrier. This study provides a novel and significant insight into the surface-confinement strategy and lays the foundation for the design of Cu-based catalyst site distribution.
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JOURNAL OF MEDICINAL CHEMISTRY
·
2025
·
IF 6.8
Qing-Hua Shen,Long-Bo Yu,Shan-Ming Yao,Zhi-Yuan Li,Qi-Qi Zhang,Peng Wang,Cai-Ping Tan
Metalloenzyme mimics based on small molecules are valuable therapeutic candidates, but there are few reports on their mechanism of action. Inspired by natural enzymes, we designed two Cu–Fe bimetallic multienzyme mimetics (CuFc1 and CuFc2). Due to the coordination of the bimetallic centers, CuFc1 exhibits mimetic activities for multiple enzymes, including peroxidase (POD), catalase (CAT), superoxide dismutase (SOD), and glutathione oxidase (GSHOx). CuFc1 can catalyze cascade reactions from •O2– and H2O2 to O2 and •OH, which leads to a storm of reactive oxygen species and causes cuproptosis and ferroptosis in cancer cells simultaneously. As CuFc1 treatment upregulates the expression of PD-L1, it acts synergistically with the PD-L1 inhibitor (BMS-1) to remodel the tumor immune microenvironments and stimulates intense anticancer immune responses in vivo. In summary, through reasonable molecular design, we first demonstrate the enormous potential of metallo small molecule-based multienzyme mimics in cancer immunotherapy.
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PubMed
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ACS Catalysis
·
2025
·
IF 13.1
Zhiying Liu,Meiqing Shen,Shuhuan Wang,Chunjuan Zhang,Jun Wang,Wei Li,Feng Gao
To elucidate how CeO2 additives enhance the activity and stability of Cu-SSZ-13 SCR catalysts, we investigated two CeO2/Cu-SSZ-13 composite catalysts with Cu loadings of 1.0 and 2.5 wt %. These catalysts were characterized using an array of techniques, including XRD, SEM, TEM, NMR, H2-TPR, NH3-TPD, DRIFTS, DFT and SCR reactions under both steady-state and transient kinetic analysis conditions. Our findings demonstrate that CeO2 promotes low-temperature SCR by forming exchanged, isolated Ce-ions, which enhance Cu-ion coupling efficiency. External surface CeO2 particles can convert NO + O2 to surface nitrates, but these species primarily act as spectators below ∼250 °C, and do not contribute to the enhancement of low-temperature SCR activity. In contrast, these surface CeO2 particles can synergizes with Brønsted acid sites (BAS) to elevate high-temperature SCR activity. Furthermore, hydrothermal stability and sulfur resistance are improved by the presence of external surface CeO2 particles, a benefit that applies irrespective of Cu loading.
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COLLOIDS AND SURFACES B-BIOINTERFACES
·
2025
·
IF 5.6
Die Hu,Xuexun Zhang,Shiwen Gong,Wentao Ma,Bo Cheng,Jing Yang,Lesan Yan,Binbin Li,Tong Qiu,Xinyu Wang
With the wide application of soft tissue fillers, implant material-induced inflammatory reactions have become a key factor affecting the therapeutic efficacy. This study developed an injectable filler with enhanced anti-inflammatory and antioxidant effects by adsorbing glycyl-L-histidyl-L-lysine copper complex (GHK-Cu) onto hydroxyapatite microspheres (HAPs), marking the first combination of HAPs and GHK-Cu to address inflammation caused by soft tissue fillers. GHK-Cu was successfully loaded onto HAPs by electrostatic adsorption. HAPs were then mixed with carboxymethyl cellulose (CMC), glycerol (GLY), and water to form GHK-Cu@CMHA gel. The study focus on the effective combination of HAPs as a carrier for sustained GHK-Cu delivery and the anti-inflammatory properties of GHK-Cu. GHK-Cu@CMHA exhibits sustained release properties for 7 days, which ensures prolonged therapeutic effects, minimizes peptide waste and reduces injection frequency, with good flowability and injectability. In the model of LPS-induced inflammation model in vivo and in vitro, GHK-Cu@CMHA gel reduced levels of inflammatory factors and Reactive oxygen species (ROS) levels decreased, while superoxide dismutase (SOD) activity was enhanced. In this process, H&E staining and Masson staining revealed significant collagen deposition. These findings further confirm that GHK-Cu@CMHA is a novel injectable soft tissue filler with good anti-inflammatory and antioxidant properties, which holds well potential for inflammation inhibition.
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PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Bowen Wang,Lu Song,Chen Peng,Ximeng Lv,Gengfeng Zheng
The acidic CO 2 reduction reaction (CO 2 RR) offers a promising approach to mitigate CO 2 reactant loss and carbonate deposition, which are challenging issues in alkaline or neutral electrolytes. However, the hydrogen evolution reaction (HER) competes in the proton-rich environment near the catalyst surface as a side reaction, reducing the energy efficiency of generating multi-carbon (C 2+ ) products. In this work, we proposed a palladium (Pd) doping strategy in a copper (Cu)-based catalyst to stabilize polarized Cu 0 -Cu + sites, thus enhancing the C C coupling step during the CO 2 RR while suppressing HER. At an optimal doping ratio of 6%, the Pd dopants were well dispersed as single atoms without aggregation, allowing for the stabilization of subsurface oxygen (O Sub ), preserving the polarized Cu 0 -Cu + active sites, and reducing the energy barrier of C C coupling. The Pd-doped Cu/Cu 2 O catalyst exhibited a peak Faradaic efficiency (FE) of 64.0% for C 2+ products with a corresponding C 2+ partial current density of 407.1 mA∙cm −2 at −2.18 V versus a reversible hydrogen electrode, a high CO 2 single-pass conversion efficiency (SPCE) of 73.2%, as well as a high electrochemical stability of ∼ 150 h at industrially relevant current densities, thus suggesting a potential approach for tuning the electrocatalytic CO 2 performances in acidic environments with higher carbon conversion efficiencies.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Zesheng Deng,Songchang Hu,Jiahui Ji,Shiqun Wu,Haijiao Xie,Mingyang Xing,Jinlong Zhang
Cu is widely used to prepare high-value products in photocatalytic CO 2 reduction reaction (CO2PR). The valence state of transition metals usually has a great impact on the catalytic process. However, the research on Cu valence in CO2PR is lack for its complex valence change. In current work, Cu x /P25 with stable Cu valence composition in CO2PR is prepared. The results show that Cu is composed of Cu 0 and Cu 2 O, and their proportions change regularly as Cu loading changing, which are linearly related to the selectivity of the corresponding products of CO2PR. Combined with thermodynamic and kinetic analysis, the CO adsorption and activation on the surface of Cu 0 and Cu 2 O are considered to be the key to determine the product of CO2PR, which is further confirmed by DFT calculation. Cu 0 and Cu 2 O are proved to be active site of producing CH 4 and CO, respectively. In this case, a reference for the study of highly selectivity Cu based photocatalysts is provided.
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