Lubrication Science
·
2024
·
IF 1.8
Cong Liu,Yanguo Yin,Rongrong Li,Haoping Wang,Liang Li
A strategy involving the use the rare-earth compound LaF 3 with good lubrication and stability properties as a filler in the preparation of Cu-based composites was proposed to solve the problem of poor wear resistance in Pb-free Cu-Bi materials. The influence and regulatory mechanism of LaF 3 content on the mechanical and tribological properties of these composites were studied. The results indicate that LaF 3 has a good refining effect on Cu alloy grains, and LaF 3 and Bi are distributed in a network along the grain boundaries of the Cu alloy in the material. As the LaF 3 content increases, the mechanical properties and friction coefficient of the composite gradually decrease, and the wear rate first declines and then increases. The wear resistance of Cu-Bi composite containing LaF 3 mainly depends on the mechanical support provided by the matrix. When the LaF 3 content is higher than 6%, the composite strength is extremely low, and the increase in lubricant content at the friction interface does not play a decisive role in the material wear behaviour. The material wear rate increases with the increase in LaF 3 content. Therefore, using 6% LaF 3 is recommended to improve the wear resistance of the material and maintain a balance among its mechanical properties, antifriction and wear resistance.
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TRIBOLOGY INTERNATIONAL
·
2024
·
IF 6.1
Lulu Tian,Yuanping Huang,Chaoran Li,Shuang Chen,Jiayu Peng,Liyong Niu,Zhijun Zhang
Complex operating conditions pose greater challenges for lubricants, making the development of multi-functional additives a trend. This research introduces a multifunctional Cu-Mo-S nanoparticle (CMS) additive, synthesized using a unique one-pot in situ method. The CMS significantly improved the tribological performance and oxidation stability of base oils. Specifically, 0.5 wt% CMS manifested a remarkable reduction in the friction coefficient and wear volume of ester-based oils by 74.75% and 95.91%, accompanied by a noteworthy increase in the extreme pressure capabilities exceeding 50%, outperforming the individual copper nanoparticles, organic molybdenum, and their mixtures. The remarkable results are attributed to the distinctive structure of CMS, which decomposed during the friction process, forming a continuous friction film containing copper, molybdenum, and iron compounds.
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ANALYTICAL CHEMISTRY
·
2025
·
IF 6.7
Yuan Qin,Huimei Liang,Jia Wu,Zheyang Chi,Shulin Zhao,Fanggui Ye
Natural enzyme cascades, including the same and different kinds of enzymes, have been widely used in biosensing. However, it is still a challenge for nanozymes, the mimics of natural enzymes, to achieve biosensing with different types of enzyme-like activities based on cascade reactions, such as hydrolase and oxidoreductase. Considering the characteristics of the multienzyme-like activity of some nanozymes, as a proof of concept, this study demonstrates a Cu/Ce-MOF-808 nanozyme as a self-cascade catalyst with hydrolase-like and catechol oxidase-like activities. Taking organophosphorus pesticides as an example, we constructed a self-cascade catalytic reaction for the one-step colorimetric detection of isocarbophos. Specifically, the hydrolase-like activity of Cu/Ce-MOF-808 can hydrolyze isocarbophos to produce colorless isopropyl salicylate, which is further oxidized by the catechol oxidase-like activity of Cu/Ce-MOF-808 and complexed with 4-aminoantipyrine (4-AAP) to produce red quinoneimine under neutral conditions with illumination. Thus, a colorimetric strategy for sensitive isocarbophos analysis is developed, with a linear range of 0.90–400.00 μg·mL–1 and a detection limit of 0.42 μg·mL–1. This research presents a new approach to the design and synthesis of nanozymes and has great application potential in the field of nanozyme cascade biosensing.
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DOI
PubMed
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ACS Catalysis
·
2025
·
IF 13.1
Yifan Li,Jiaxing Li,Lin Chen,Yunpeng Long,Xing Yuan,Junhua Li,Yue Peng
The low selectivity for N2 in the oxidation of NH3 over commercial Pt/Al2O3 catalysts is primarily due to the overoxidation of NH3 facilitated by Pt sites, leading to the formation of unwanted byproducts such as N2O and NO. In this study, we present a novel strategy to enhance N2 selectivity while maintaining NH3 conversion by constructing Pt–O–Cu dual sites. These dual sites exhibit synergistic acid-redox characteristics through surface electron transfer mediated by bridged lattice oxygen. Additionally, the ability of surface-adsorbed oxygen to exchange with lattice oxygen is significantly improved. The electron-deficient Cu sites enhance NH3 adsorption by providing empty 3d orbitals, while the electron-rich Pt sites promote NH3 dehydrogenation. Subsequently, the formation of –NH or –N intermediates at the Pt sites can react with adsorbed NH3 on the Cu sites to produce N2, predominantly following the integrated selective catalytic reduction mechanism. The optimized dual-site catalyst achieves over 95% NH3 conversion and N2 selectivity at 180 °C.
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Processes
·
2025
·Vol. 13
·期 4
·1110
·
IF 2.8
Shikang Zhao,Guohong Chen,Kaiqi Zheng,Shaojie Li,Jiaqi Xu,Fanan Wang,Xueping Liu,Rengui Weng
γ-Valerolactone (GVL) is a promising bio-based platform molecule with significant potential for energy applications. The production of GVL via biomass-based levulinic acid (LA) is an important reaction. To enhance the conversion and selectivity of non-precious-metal catalysts in the LA-to-GVL process and to better understand the key factors influencing this conversion, we conducted a series of experiments. In this study, supported Cu-Ni bimetallic catalysts (Cu-Ni2/Al2O3) were prepared using layered double hydroxides (LDHs) as a precursor. Compared with Cu-Ni catalysts synthesized via the conventional impregnation method, the Cu-Ni2/Al2O3catalysts exhibit higher catalytic activity and stability. The results demonstrated that efficient conversion was achieved with isopropanol as the hydrogen donor solvent, a reaction temperature of 180 °C, and a reaction time of 1 h. The yield of GVL reached nearly 90%, with a decrease of approximately only 6% after six consecutive cycles. The Cu-Ni2/Al2O3catalyst proved to be effective for converting biomass-derived LA to GVL, offering a route that not only reduces production costs and environmental impact but also enables efficient biomass-to-energy conversion.
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ELECTROCHIMICA ACTA
·
2025
·
IF 5.6
Meina Tan,Yang Qin,Jiaxin Luo,Yiping Wang,Fazhi Zhang,Xuhui Zhao,Xiaodong Lei
Aqueous hybrid-ion batteries (AHBs) offered various advantages, including low cost, high energy density, high operation voltage, safety, and durability. These characteristics made them an attractive choice for energy storage devices. CuS was a high-capacity cathode material for Al storage. However, the rate performance of CuS under high-voltages conditions was not satisfying. Here, we prepared Co-doped CuS (Co-CuS) nanosheet material with the small band gap by using the ball milling method as the cathode material of aqueous Cu-Al hybrid-ion battery. Co doping can improve the electron transport capacity and provide more active sites. At high current density, Co doping enhances the electrochemical kinetics, operating voltage and electrochemical performance of the materials. The battery exhibits a capacity of 175 mAh g -1 at 2000 mA g -1 and 108 mAh g -1 at 4000 mA g -1 . After 200 cycles of charge and discharge tests, a capacity of 93 mAh g -1 remains. This offers a valuable approach to the development of aqueous Cu-Al hybrid-ion battery electrode materials with good electrochemical performance under high operating voltage and high current conditions.
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INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Chunpei Yu,Bonan Gu,Jiaxin Wang,Junhong Chen,Wenchao Zhang,Wei Shi,Gexing Yang,Xiaoting Lei,Junwu Zhu
The development of green primary explosives has become a “holy grail” of energetic materials research. Cu-based 5-nitrotetrazolate is considered one of the most promising candidates due to its excellent blasting power and environmentally benign nature. However, synthesizing Cu-based 5-nitrotetrazolate controllably and securely remains highly challenging. Herein, room-temperature anodization of metallic Cu and a Cu(I)–imidazole nanowire array on copper substrates in a sodium 5-nitrotetrazolate electrolyte leads to in situ electrosynthesis of Cu(I) 5-nitrotetrazolate (DBX-1, CuNT) and its analogue, Cu(II) 5-nitrotetrazolate [Cu(NT)2], respectively. Both obtained CuNT and Cu(NT)2 films demonstrate remarkable energy output and good laser-induced ignition performance. The thermal stability (Tp = 291 °C) and electrostatic safety (E50 = 2.54 mJ) of CuNT proved to be superior to those of Cu(NT)2 (Tp = 257 °C, and E50 = 0.57 mJ). Remarkably, this study provides an exciting new method for the rational design and development of Cu-based 5-nitrotetrazolate as a primary explosive for advanced initiating applications.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Xianglei Liu,Chuang Bao,Zhonghui Zhu,Hangbin Zheng,Chao Song,Qiao Xu
Methanol steam reforming (MSR) is considered as an effective method for hydrogen storage and generating high-quality hydrogen for fuel cells. In this work, mesoporous Cu/TiO 2 –CeO 2 catalysts are proposed to achieve efficient MSR based on synergetic effects of thermal and photon energies . Optimal Ti/Ce molar ratio is found to be 2:1, for which excellent methanol conversion of 100% and extremely low CO selectivity of 2.2% are achieved for thermal catalysis. Further applying UV light (280–400 nm) irradiation while keeping the same temperature, the hydrogen production rate is enhanced to be 78.8 mmol/h/g from 58.6 mmol/h/g. The underlying mechanism is attributed to photogenerated electron hole pairs promoting the REDOX reaction of intermediate product methyl formate based on in situ diffuse reflectance infrared fourier transform spectra (DRIFTS). This work provides a new method to enhance methanol steam reforming performance via thermo-photo synergic effects, and paves a way for the development of direct solar driven MSR techniques.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Linyue Zhang,Jiewen Deng,Jieli Ou,Gaofeng Zhou,Yongsheng Fu,Yiqing Liu
In this paper, it was found that boric acid (BA) could improve the degradation of rhodamine B (RhB) by Cu(II)-activated peroxymonosulfate (PMS). At pH 8.5, the addition of BA could stabilize pH and generate the highly active complexes with Cu(II), which could accelerate the reduction of Cu(II) by PMS. The formed Cu(I) could activate PMS to form sulfate radical (SO 4 – ) and/or be oxidized to Cu(III). According to the results on radical scavenging experiments, SO 4 – and Cu(III) both participated in the degradation of RhB in BA/Cu(II)/PMS system. Because the binding ability of BA with Cu(II) is pH-dependent, the promotion effect of BA in Cu(II)/PMS process occurred only under weakly alkaline conditions. The presence of HCO 3 – and natural organic matter (NOM) both had an inhibition effect on RhB degradation in BA/Cu(II)/PMS system, while Cl – could promote the removal of RhB. This study provides a new idea to enhance PMS activation by Cu(II).
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Mingshi Deng,Wei Jin,Wenjuan Yang,Lingling Tian,Xinghua Gao,Xuefeng Wang,Lingyan Feng,Metini Janyasupab,Bingpu Zhou,Yuan Zhang
Mycophenolic acid (MPA), which is a potent immunosuppressant, has been widely used to prevent organ rejection after organ transplantation. In clinical practice, it is essential to monitor the free MPA concentration. Herein, convenient and fast electrochemical microsensing technology is developed for directly detecting the MPA concentration. To implement this method, ultrathin copper-based metal–organic framework (Cu–MOF) nanosheets with a thickness of about 6.6 nm are used to detect MPA. An analysis of electrochemical behavior reveals the direct electrochemical catalytic oxidation mechanism of MPA molecules on a Cu(II) tetrakis(4-carboxyphenyl)porphyrin (Cu–TCPP)-modified electrode. Furthermore, electrochemical testing results show that the ultrathin Cu–TCPP nanosheet-based microsensor exhibits high sensitivity and specificity for MPA in the nano- to micromolar range, with a detection limit of 10 nM. X-ray absorption spectroscopy (XAS) characterization reveals that the unsaturated metal ions in ultrathin nanosheets are the active sites responsible for boosting the catalytic oxidation of MPA molecules. High-performance liquid chromatography–tandem mass spectrometry further shows the catalytic oxidation product of MPA and that the phenolic hydroxyl group in the MPA molecule is the active site where the catalytic reaction occurs. The considerable sensing performance of the Cu–TCPP nanosheet-based microsensor proves that it is possible to develop a fast and convenient method for the direct high-frequency monitoring of immunosuppressive drugs.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2020
·Vol. 27
·期 21
·26621-26630
·
IF 3.056
Wan Jun,Chen Lin,Li Qiang,Ye Yuxuan,Feng Xiaonan,Zhou Aijiao,Long Xuejun,Xia Dongsheng,Zhang Tian C.
Among the Cu(II) removal methods, adsorption is a favorable technique and has attracted large attention because of its effectiveness and low cost. In quest of seeking for a favorable adsorbent with a high Cu(II) adsorption capacity and excellent reusability, researchers have paid much attention to hydrogels with three-dimensional networks. In this study, a novel hydrogel (P(AMPS-co-VDT) hydrogel) based on free-radical polymerization was synthesized with ionic monomer sodium 2-acrylamido-2-methylpropane sulfate (AMPS-Na + ) and 2-vinyl-4, 6-diamino-1, 3, 5-triazine (VDT) and applied for Cu(II) adsorption in aqueous solutions. The hydrogel was characterized for swelling performance, surface morphology, functional groups, thermal gravimetric behavior, and elements. The maximum Cu(II) adsorption capacity (175.75 mg/g) was relatively high compared with other hydrogels. The P(AMPS-co-VDT) hydrogel also was found to have a relatively good Cu(II) desorption and reuse behavior. The adsorption mechanism could be chelation and ion exchange. This work provides a new hydrogel for effective Cu(II) removal in the future.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Fangyi Pei,Zhimiao Wang,Jianhua Lv,Fang Li,Wei Xue
Cu–Zn–Al catalyst was prepared by the co-precipitation method, and the catalytic performance for transfer hydrogenation of acetophenone (AP) to 1-phenylethanol (1-PhE) was evaluated using isopropanol (IPA) as a hydrogen source. The addition of Zn changed the morphology of the catalyst and reduced aggregation of catalyst particles, resulting in highly dispersed Cu active sites. As the Zn content increased, the valence state of Cu species changed. When the Cu/Zn molar ratio was 2/3, the Cu+/Cu0 ratio in the catalyst was 0.81, resulting in good selectivity for 1-PhE. The reaction conditions were optimized over the Cu–Zn–Al catalyst with a Cu/Zn molar ratio of 2/3. When the reaction was performed at 180 °C for 2 h with an IPA/AP molar ratio of 15, the AP conversion was 89.4% and the 1-PhE selectivity was 93.2%. The Cu–Zn–Al catalyst showed good stability, and AP conversion and the 1-PhE selectivity were essentially unchanged after five cycles.
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