SEPARATION AND PURIFICATION TECHNOLOGY
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2024
·
IF 8.1
Zhe Liu,Qi Liu,Xuhua Zhang,BingRui Shi,Dandan Qin,Jiaxuan Wang,Aining Zhang,Yongjun Liu
In this study, the sewage sludge was converted into sludge biochar (SBC) and doped with Cu-Ni bimetal to synthesize a novel composite catalyst (Cu-Ni@SBC) for the activation of H 2 O 2 for phenol degradation. Characterization results showed that the Cu-Ni bimetal was successfully doped into the SBC and led to the formation of a porous structure with abundant cavities, resulting in a larger specific surface area and higher adsorbed oxygen content. Mechanism analysis revealed a valence state conversion cycle between Cu 0 -Cu(II), Ni(III)-Ni(II) and Cu-Ni which made Cu-Ni@SBC have higher electron transfer performance. Response surface methodology was applied to determine the optimal preparation and reaction conditions, under which the Fenton-like system composed of Cu-Ni@SBC and H 2 O 2 removed 100 % of phenol and mineralized 69.1 % of TOC from simulated wastewater. In addition, the experimental results showed that the Cu-Ni@SBC material had a relatively wide pH adaptation range (4–8), and the removal efficiency of phenol could reach 76.4 % after 5 cycles of experiments, and the catalytic inhibition rates of the two common coexisting anions, HCO 3 – and Cl - , were 17.1 % and 0 %, respectively. The results of practical application revealed that the phenol removal efficiency reached 90.44 % and the pollutant mineralization rate could reach 58.5 % within 90 min, which proved that the catalyst was suitable for the advanced degradation of organic matter in coal chemical wastewater. Therefore, Cu-Ni@SBC can be considered as a promising Fenton-like catalyst, and the process method is also of some guiding significance for the treatment of coal chemical wastewater.
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JOURNAL OF THE INDIAN CHEMICAL SOCIETY
·
2025
·Vol. 102
·期 12
·102313
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IF 3.4
Shuang Zhou,Yuru Yang,Qingmiao Pu,Bingyu Luo,E. Li,Jiao Fu,Xiaodong Su,Zhenfu Jia
A flexible non-enzymatic glucose electrochemical sensor with high sensitivity and stability was constructed using the electrode by in situ growth of Cu/Cu 2 O nanocomposites on carbon dots (CDs) modified carbon cloth (CC) by electrodeposition reduction method, where the modification of CDs provided a stable anchoring site for the growth of the nanocomposites and enhanced the stability of Cu/Cu 2 O in solution. The electrode had a glucose detection range of 0.2–100 μM and 0.1–1 mM, which offered the advantages of high sensitivity (4510.89 μA mM −1 cm −2 and 2385.94 μA mM −1 cm −2 ) and low detection limit (0.66 μM). The sensor also exhibits excellent selectivity, reproducibility, immunity to interference and long-term stability. In addition, In order to verify the enhancement effect of CDs on their electrochemical properties, Cu/Cu 2 O electrodes were prepared in this paper by the same method on several CCs modified with different CDs (e.g., glycine, cysteine and riboflavin), The results showed that the incorporation of CDs enhanced the electrocatalytic ability compared to the electrode without CDs modification, indicating that CDs can provide more active sites and electron transport channels for Cu/Cu 2 O, and that this CDs-enhanced Cu/Cu 2 O nanocomposite can be used for non-enzymatic glucose electrochemical sensors.
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CHEMICAL ENGINEERING SCIENCE
·
2025
·
IF 4.3
Longxiangyu Cheng,Zuwei Xu,Haibo Zhao
To address the trade-off between CO 2 conversion and methanol selectivity inherent in Cu-ZnO based catalysts and mitigate the drawbacks of wet chemical synthesis methods, in this study, Cu/ZnO/Al 2 O 3 catalysts with high methanol selectivity were developed for CO 2 hydrotreating to methanol using a mechanochemical method suitable for industrial scale preparation. Combining CuO and ZnO precursors of different sizes (micronscale or nanoscale), four catalyst variants were prepared by a mechanochemical method combining ball milling and auto-combustion of citric acid, which compared with commercial catalyst prepared by co-precipitation method. Characterizations of the catalysts structure and element distribution indicate that due to the different thermal decomposition kinetics of copper citrate and zinc citrate during the calcination process, the surface Zn content of the ball milling catalysts significantly increase, thereby promoting the formation of the Cu-ZnO x interface. Among them, the catalyst of plain CuO + nano ZnO shows the best performance (0.4 g MeOH •g cat -1 •h −1 ). Although its CO 2 conversion is lower than that of commercial catalyst, it has better methanol selectivity and produced higher methanol space–time yield which remained stable during the 30 h stability test. In addition, H 2 -TPR and CO 2 -TPD experimental results show that although mechanical mixing resulted in ball milling catalysts with large copper grains, more oxygen vacancies and moderately strong basic sites enhanced Cu-ZnO synergism, inhibited the reverse water–gas shift (RWGS) reaction, and facilitated methanol synthesis.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Qiuyue Ding,Huijie Wei,Yixuan Zhang,Shidong Zhao,Yanyan Xi,Songqing Hu,Xufeng Lin
Performance of the dehydrogenation catalyst is an essential issue for hydrogen storage and transportation based on liquid organic hydrogen carriers (LOHC). To overcome the problem of traditional supported noble metal catalysts, suffering from relatively low catalytic activity and selectivity, this work designed an efficient Pt–Cu synergistic catalyst by introducing additional N, O and other coordination sites as metal anchoring points in the Al 2 O 3 support during catalyst preparation. This strategy achieved high spatial isolation of Cu from Pt nanoparticles (NPs) by adding the regulator of imidazolidinyl urea to the catalytic support, actualizing highly dispersed Pt and Pt–Cu alloy nanoparticles (NPs) and subsequently quantifiable synergistic catalytic effect for dehydrogenation of dodecahydro-N-ethylcarbazole (12H-NEC). Notably, the catalytic activity of Pt 2·0 Cu 0·1 /Al 2 O 3 -MR catalyst was substantially higher than that of Pt 2·1 /Al 2 O 3 -MR. A peak Pt–Cu synergistic index of 1.39 was attained in the dehydrogenation rate-determining step. The excellent synergistic effect between the Pt and Cu components was attributed to the modified electronic properties of the novel Pt–Cu alloy species under spatial confinement and the suppression of strong metal-support interactions (SMSI), as reflected by several characterization tools like XPS and HRTEM. Furthermore, the catalytic activity is also influenced by diffusion effects. DFT calculation further helped revealing that the Cu component was beneficial for the Pt cluster to lower the reaction barrier of the rate-determining step of 12H-NEC dehydrogenation.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yangzhi Xu,Zhixue Hou,Shitao Peng,Shufang Zhao,Xiangxiang Chen,Chengwei Wang,Siyu Yao,Lili Lin
Cu-supported nano-sized oxides inverse catalysts hold promise for low-temperature methanol synthesis via CO 2 hydrogenation, but their performance is highly dependent on the synthesis process. For ZrZnO x /Cu inverse catalysts, this work demonstrates that methanol synthesis activity depends linearly on the oxygen vacancy (O v ) concentration within the ZrZnO x nanoparticles, but is independent with the Cu support. Through orthogonal experiments, it is found that the density of O v is highly sensitive to precipitants, and the space-time yield of methanol can exceed 900g CH3OH /kg cat /h as long as the ZrZnO x nano-oxides were precipitated by H 2 C 2 O 4 , which are 1.6 to 2.1 times greater than those of catalysts prepared using other precipitants. Comprehensive characterization reveals that H 2 C 2 O 4 promotes the formation of uniformly dispersed ZrZnO x nanoparticles with abundant oxygen vacancies (O v ). These findings demonstrate the critical role of O v -rich oxide nanoparticles in constructing high-performance inverse catalysts and offers valuable insights into the development of efficient and stable CO 2 -to-methanol systems.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Ruichen Zhang,Luyao Wang,Chunjian Duan,Shengmao Zhang,Liyong Niu,Pingyu Zhang,Zhijun Zhang,Seeram Ramakrishna,Chuanping Gao
The service life of self-lubricating spherical plain bearing (SLSPB) is heavily dependent on tribological property of polymeric liner between inside and outer ring. To meet urgent needs, such as ultra-long service life and harsher working conditions, enhancing SLSPB liner's tribological property is an effective option. Herein, different from conventional microcapsules, a novel nanocapsule containing nano-oil was successfully prepared mainly based on excellent tribological performance of Poly alpha olefin (PAO6, base oil) containing copper nanoparticles (Cu NPs) and pore canal and slow-release advantage of hollow mesoporous silicon nanocapsules (HMSNCs, hm -SiO 2 NCs). The results show that as-prepared PAO6/Cu@ hm -SiO 2 NCs have an average diameter of ∼150 nm and a content of 40 wt% Cu-nano-oil; when its content is 15 wt%, friction coefficient (COF) and wear rate ( W R ) of Epoxy resin (EP, as basic material of SLSPB) can be reduced by 88 % (0.74 → 0.09) and 99 % (47.312 × 10 −6 mm 3 /Nm to 0.646 × 10 −6 mm 3 /Nm), respectively. For one thing, such results have a close relationship with a synergistic effect among nano-oil, hm -SiO 2 NPs and EP resin. For another, a high-performance tribofilm with a gradient structure also plays a critical role, and this structure is closely associated with the size effect of DDP-Cu NPs, hm -SiO 2 nanoparticles, and PAO6/Cu@ hm -SiO 2 NCs. The corresponding tribological mechanism is also systematically investigated according to various surface and chemical analyses. The findings may pave a new strategy to enhance tribological property of polymer-based rubbing pairs, and contribute to designing a high-performance (such as ultra-long serve life, superior tribological performance, etc.) SLSPB liner.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Lingwei Yu,Leyi Zhou,Qi Guo,Hongchuan Zhang,Xi Xiao,Ruixue Zhao,Zifeng Yan,Ying Zhang
The challenge of converting carbon dioxide (CO 2 ) electroreduction into high value-added products is to obtain highly selective electrocatalysts. Research has shown that cuprous oxide (Cu 2 O) effectively facilitates the activation of CO 2 and suppress the competing hydrogen evolution reaction. However, during the process of electrochemical reduction, the valence state of Cu 2 O is prone to transformation. Herein, a series of Cu 2 O–CeO 2 -X catalysts (X represents different amounts of CeO 2 added) by applying Cu 2 O onto Cerium oxide (CeO 2 ) nanorods were synthesized via the impregnation method and used as electrocatalysts. We found that the Faradaic efficiency of methane (FE-CH 4 ) for Cu 2 O–CeO 2 -2 reached 65.1 % at −1.6 V vs. RHE, exceeding many catalysts previously reported. From the Cu LMM Auger spectra, it was found that the valence state of Cu species in Cu 2 O–CeO 2 -2 is mainly Cu 0 (accounting for 93.39 %), while in Cu 2 O–CeO 2 -3, the proportion of Cu 0 is 56.34 %. This indicates that CeO 2 has a regulatory effect on the valence state of Cu species. Additionally, we observed the valence state of Cu in Cu 2 O–CeO 2 -2 after the CO 2 reduction reaction and found that the proportion of Cu 0 changed little (94.97 %), which proves that CeO 2 plays a role in stabilizing the valence state of Cu. Research has demonstrated that Cu 0 can adsorb the ∗CO intermediate on its surface, followed by a hydrogenation reaction to generate CH 4 (∗CO + H + + e − → ∗CHO). Copper-based catalysts in which Cu 0 dominates among the Cu species are conducive to the conversion of CO 2 into CH 4 . In situ ATR-SEIRAS spectra confirmed the presence of key intermediates such as ∗CHO and explored the formation pathway of CH 4 (CO 2 → ∗COOH → ∗CO → ∗CHO → ∗OCH 2 → CH 4 ). This study provides a new way to design efficient copper oxide-based catalysts for CO 2 electroreduction by adjusting and stabilizing the ratio of copper valence state reasonably.
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Biosurface and Biotribology
·
2025
·Vol. 11
·期 1
·e12090
·
IF 1.8
Yi Duan,Qi Wu,Jiangtao Lin,Yourong Duan,Qi Wang,Yuanyuan Li
In this study, the authors designed a paper-based electrochemical immunodevice modified with copper embedded in copper sulphide hollow nanocages wrapped with Au nanoparticles (Cu@CuS@Au NPs) for the specific detection of prostate-specific antigen (PSA), aiming to advance point-of-care testing. The large specific surface area of Cu@CuS nanocages enables efficient capture of biotin antibodies, leading to the direct amplification of the signal through the inhibition of electron transport in the redox process of Cu, eliminating the need for universal redox electron mediators. Additionally, Au NPs on the surface of Cu@CuS can accelerate charge transfer and conjugate with anti-PSA. The hierarchical morphology and structure of Cu@CuS nanocages were characterised using scanning electron microscopy and transmission electron microscopy. The fabrication process of the immunodevice was monitored using cyclic voltammetry and electrochemical impedance spectroscopy analyses. PSA was sensitively detected using differential pulse voltammetry on this proposed immunodevice within a linear range from 0 to 100 ng/ml ( R 2 = 0.996), achieving a low detection limit of 0.077 ng/ml. In addition, the practicality of the developed immunosensor has been proven by successfully detecting PSA in human serum samples obtained from clinical settings. The integration of electrochemical sensors and microfluidic devices holds promise for developing cost-effective approaches in clinical immunoassays.
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JOURNAL OF MOLECULAR STRUCTURE
·
2025
·
IF 4.7
Xingshi Li,Ruihan Zhang,Linlin Chen,Zhihui Cheng,Yaoguo Huang,Yali Zhang
A novel composite material, MIBuXATT@GO, was synthesized by functionalizing graphene oxide (GO) with a bi-ligand triazole-thione ligand, 3-methyl isobutylxanthate-4-amino-1,2,4-triazole-5-thione (MIBuXATT), for the efficient adsorption of Cu(II) ions. This modified material served as an adsorbent to enhance the selective adsorption of Cu(II) from wastewater by synergistically combining physical and chemical adsorption mechanisms. MIBuXATT@GO was characterized by XRD, SEM/EDS, and FTIR. Under the optimal conditions (pH=4, adsorbent dosage 250 mg/L, contact time 60 minutes), the maximum adsorption capacity of Cu(II) by the material is 97.24 mg/g, which is 1.3 times higher than that of GO. Meanwhile, the adsorption process of MIBuXATT@GO to Cu(II) is characterized as spontaneous endothermic chemisorption. Furthermore, the experimental results regarding metal ion adsorption selectivity indicate that MIBuXATT@GO exhibits superior selectivity for Cu(II) compared to Mn(II), Zn(II), Co(II), and Ni(II), which is an improvement over GO. The results indicate that MIBuXATT@GO is a promising adsorbent for the removal of Cu(II) ions from aqueous solutions, offering high capacity, rapid kinetics, and excellent selectivity. The adsorption mechanism was elucidated through FTIR, UV, XPS, and DFT calculations, revealing the critical role of the thiocarbonyl and triazole-thione functional groups in Cu(II) coordination. This work provides a new strategy for designing efficient adsorbents for heavy metal ion removal.
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Molecular Catalysis
·
2024
·
IF 3.9
Yintong Zhou,Xiaohui Ren,Xusheng Wang,Jiayao Mao,Haoran Zhang,Jiaxing Wang,Yan Yang,Feng Ma,Huating Liu,Ningdong Feng,Rongsheng Chen,Hongwei Ni
Copper-based catalysts have been extensively investigated for electrocatalytic reduction of CO 2 owing to their unique capabilities. To our notice, organic molecules can be employed as molecular modifiers to tailor the CO 2 reduction selectivity of Cu-based catalysts. Herein, three kinds of molecular modifiers, pyridine, triethylamine, and potassium hydroxide have been utilized for fabricating Cu-based electrocatalysts. Experimental investigations reveal that pyridine as molecular modifiers have the ability to alter the surface active sites of the Cu-based catalysts. The modification can facilitate the conversion of CO 2 into HCOOH. Notably, the highest Faradaic efficiency achieved in our tests for HCOOH can reach to an impressive value of 80.2 %. Moreover, the catalyst maintains its structure and performance with high stability that exceeding 10 h at a current density of 30 mA cm −2 (-1.1 V vs. RHE). Based on structural characterization and theoretical calculations, we propose that the pyridine molecule can facilitate CO 2 accumulation, and the pyridine modification of the CuO/Cu(OH) 2 surface active site can reduce the reaction energy barrier for the electrocatalytic reduction of CO 2 to HCOOH.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Meng Liu,Caixia Miao,Peng Xiao,Zhijie Wu
The direct conversion of methanol, a cheap and readily available feedstock, into value-added methyl acetate (MA) is a promising route. Considering the MA formation mechanism is complex, the design of highly selective catalysts is a huge challenge. Herein, we report a Cu@Zr-Beta catalyst, encapsulated Cu metal clusters within Zr-Beta zeolite by an in-situ two-step hydrothermal method, which exhibits high dispersion of Cu species and strong metal-support interaction between Cu and framework Zr species. The formation rate of MA using the Cu@Zr-Beta catalyst is as high as 2.84 mol kg cat -1 h −1 with a methanol conversion of 8.7 % and a MA selectivity of 55.8 % at 240 °C, which outperforms comparison catalysts. Experimental and characterization studies confirm that the electronic interactions between the encapsulated Cu species and Zr atoms not only enable the production of abundant and stable Cu + species but also promote the synergistic effect between Cu + and framework Zr species, thus accelerating the conversion of methanol to MA. In-situ FT-IR and reaction results show that the Cu 0 site is responsible for the dehydrogenation of methanol to CH 2 O*, which then moves to Cu + -Zr(OSi) 4 site and couples with CH 3 O* to form CH 3 CHO*, and finally produces MA through C-O coupling with another CH 3 O*.
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高影响因子
Journal of Materials Chemistry A
·
2025
·
IF 9.5
Lin-Tao Lv,Zhi-Jie Zhu,Ming-Yuan Shen,Tao Wu,Bin He,Wen-Cui Li
O3-type layered oxides are promising cathode materials for sodium-ion batteries (SIBs). However, their application is limited by tortuous Na+ diffusion channels and complex phase transitions. In this study, a high-rate, low-volume-strain O3-Na0.9Cu0.05Fe0.15Ni0.25Mn0.55O2 (CFNM) cathode is synthesized using a Cu and Fe doping strategy. Multiple characterization techniques and density functional theory (DFT) calculations demonstrate that co-doping modulates the TM-O (transition metal-oxygen) and Na-O bond interactions, expanding Na+ diffusion channels and reducing diffusion energy barriers; the co-doping also promotes electron localization within the TM layers, alters the Na+ deintercalation sequence, and mitigates structural degradation, thereby facilitating rapid and reversible O3-P3 phase transitions without monoclinic phase transitions. The lattice parameter changes exhibit characteristics similar to those of a solid solution, featuring a minimal volume change of 1.1%. Consequently, CFNM delivers a specific capacity of 85.5 mA h g-1 at 10 C and retains 85.2% capacity after 500 cycles at 5 C. Additionally, the full cell assembled with hard carbon (HC) achieves an energy density of 322.8 Wh kg-1 and retains 76.4% capacity after 200 cycles at 1 C. Excellent air stability further demonstrates the practical applicability of CFNM. This study provides new insights into the development of high-performance cathode materials for SIBs.
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