Frontiers in Chemistry
·
2025
·
IF 4.2
Jinwei Li,Yifei Wei,Qiang Liu,Huanhuan Guan,Chengchun Jiang,Xiaohui Sun
In this study, CuO-CoOx/SBA-15 catalysts were successfully synthesized via ultrasonic impregnation, and their performance in degrading nitrobenzene within a Fenton-like system was investigated. The catalyst materials were characterized using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), inductively coupled plasma mass spectrometry (ICP-MS), scanning electron microscopy (SEM), transmission electron microscope(TEM) and energy-dispersive X-ray spectroscopy (EDS). The CuO-CoOx/SBA-15 catalysts featured well-distributed CuO-CoOx nanoparticles within the mesoporous SBA-15 support. Compared to CuO/SBA-15 and Co3O4/SBA-15 catalysts with similar microstructures, the CuO-CoOx/SBA-15 catalysts exhibited Cu-Co dual active centers and a higher abundance of redox-active sites. During catalytic degradation, H2O2 was continuously activated on the catalyst surface through efficient Cu+/Cu2+ and Co2+/Co3+ redox cycles. The experimental conditions (initial pH, catalyst dosage, and H2O2 dosage) were optimized, resulting in 99% nitrobenzene removal over a wide pH range (3.0–9.0). The primary mechanisms for the oxidation and subsequent removal of nitrobenzene in the CuO-CoOx/SBA-15-H2O2 system were identified as reactions with hydroxyl radicals (·OH).
研究领域:
环境科学
·
催化化学
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产品关联
DOI
PubMed
高影响因子
Catalysis Science & Technology
·
2023
·Vol. 13
·期 19
·5776-5784
·
IF 5
Huichao He,Yuli Xiong,Hao Xiao,Tao Han,Yujie Guo,Jiahe Li,Qiwen Chen,Yunhuai Zhang,Jinyan Du,Gaili Ke
Water oxidation is an endothermic reaction; BiVO4-based photoanodes with good photothermal and catalytic properties would be propitious to achieve efficient water oxidation in theory. Herein, NiO/amorphous carbon/BiVO4 (NiO/C/BiVO4) and CoOx/amorphous carbon/BiVO4 (CoOx/C/BiVO4) films were prepared by a facile candle flame roasting approach, and further investigated as photoanodes for solar water oxidation. Compared to BiVO4 and C/BiVO4 photoanodes, better water oxidation performance was achieved on the CoOx/C/BiVO4 and NiO/C/BiVO4 photoanodes. At 1.23 V vs. RHE, the water oxidation photocurrent of the CoOx/C/BiVO4 and NiO/C/BiVO4 photoanodes was 2.32 and 2.41 times higher than that of the BiVO4 photoanode, respectively. The water oxidation activity on the CoOx/C/BiVO4 and NiO/C/BiVO4 photoanodes can be well maintained in the range of 84–87% after 120 min of constant reaction, which is higher than that on the BiVO4 photoanode (43% activity retained). The NiO/C/BiVO4 and CoOx/C/BiVO4 photoanodes having higher water oxidation performance can be attributed to the following integrated effects. (1) The p–n heterojunction effect of NiO/BiVO4 and CoOx/BiVO4 drives the directional transfer of holes to CoOx or NiO and weakens the carrier recombination on BiVO4. (2) Amorphous carbon, CoOx and NiO absorb and convert the long wavelength light (λ > 510 nm) into heat to improve the co-catalysis performance of CoOx and NiO, and enable the NiO/C/BiVO4 and CoOx/C/BiVO4 photoanodes for efficient water oxidation. The present work provides two effective BiVO4-based photoanodes for photothermal-enhanced water splitting, which could inspire the design and development of similar materials for photothermal-enhanced solar water splitting.
研究领域:
材料科学
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能源化学
·
光催化
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纳米技术
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表面工程
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DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2023
·
IF 4.7
Fuming Miao,Shuai Zhang,Xueliang Sun,Yamin Li,Ruize Shang,Wenli Wu,Weizhou Jiao,Youzhi Liu
In this study, Mn-CoO X / γ -Al 2 O 3 (MCA) was prepared by impregnation for catalytic ozonation of phenol in a rotating packed bed (RPB), and the effects of high gravity factor ( β ), liquid flow rate ( Q L ), initial solution pH and gaseous ozone concentration ( C O 3 ) on the mineralization of phenol were explored. The results show that the degradation rate of phenol ( η phenol ) reaches 100% at 9 min and the mineralization rate ( η TOC ) reaches 95.01% at 45 min under conditions of β = 104, C O 3 = 80 mg L -1 , Q L = 80 L/h, and pH = 6. Compared with the bubbling reactor (BR)/MCA/O 3 and O 3 /RPB systems, the η TOC of the MCA/O 3 /RPB system is increased by 25.81% and 40.85%, respectively. The electron paramagnetic resonance (EPR) results reveal that hydroxyl radical (·OH) plays a critical role in the degradation of phenol by MCA catalyzed ozonation. The quenching experiment using tertiary butyl alcohol (TBA) as a scavenger of ·OH reveals that the ratio of direct and indirect degradation of phenol is 16:9. The intermediates generated during the degradation of phenol were detected by gas chromatography-mass spectrometry (GC–MS), and possible degradation pathways were proposed. In conclusion, MCA-catalyzed ozonation and RPB have a synergistic effect on ·OH initiation and improve the degradation and mineralization of phenol. This study provides a new perspective for the degradation of phenol.
研究领域:
环境科学
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化学工程
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Rui Kang,Dayi Guo,Xinyi Luo,Hui Pan
Catalytic hydrogenation of ethyl levulinate (EL) to 1,4-pentanediol (1, 4-PDO) could provide a potential approach to obtain valuable chemicals from renewable biomass. In this study, a CuZr/CoOx catalyst was developed based on a structural topotactic transformation process of layered double hydroxides. The prepared CuZr/CoOx catalysts possess a double functionality of metal-acid sites and showed superior catalytic activity in the production of 1, 4-PDO from cascade conversion of EL. A complete EL conversion (100 %) and 93.1 % 1, 4-PDO yield were obtained under optimized conditions over catalyst CuZr/CoOx-400. The co-existence of Cu 0 and Cu + on the surface of catalyst CuZr/CoOx was confirmed by XRD and XAES characterizations. In addition, the XPS results suggested a strong interaction between Co and Cu, which would effectively stabilize the Cu + species in the catalyst. The Cu 0 was believed to activate hydrogen, while the Cu + could promote the adsorption of carbonyl group of the substrate thus facilitating the hydrogenolysis. The introducing of Zr in the catalyst greatly improved the dispersion of Cu species and increased the abundance of the acid sites as revealed by the TEM and NH 3 -TPD analysis. Catalyst CuZr/CoOx-400 also exhibited highly catalytic activity after five reaction cycles. Together with the low cost of the non-precious metals, the CuZr/CoOx catalysts demonstrate a potential for the scaled-up application in the biomass refinery process.
研究领域:
催化化学
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生物质能
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可再生资源
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Hongwei Wang,Boxiao Zhao,Xiaoming Liu,Liushui Yan,Huiqin Guo,Wang Gong,Jun Lin
Here, a series of Mn x Cd 1-x S sosoloid composite photocatalysts with visible-light activity were first prepared by a solvothermal process. The element ratio of Cd 2+ to Mn 2+ was optimized to be Mn 0.3 Cd 0.7 S in Mn x Cd 1-x S sosoloid on account of its photocatalytic activity for H 2 evolution from H 2 O in response to visible light excitation . And on this basis, the CoO x nanopariticles were loaded on the surface of Mn 0.3 Cd 0.7 S sosoloid composite to obtain a binary p-n heterojunction of CoO x /Mn 0.3 Cd 0.7 S composite through a facile impregnation process and a high temperature sintering procedure. Benefitting from the synergistic effect of the built-in electric field, binary p-n heterojunction structure, and rearrange of the Fermi level equilibrium, the as-synthesized CoO x /Mn 0.3 Cd 0.7 S composite presents a highly enhanced photocatalytic activity for hydrogen production from H 2 O in response to visible light excitation, which is demonstrated to be 53.4 and 4.0 times higher than that of the primitive CdS and Mn 0.3 Cd 0.7 S, respectively. Furthermore, after 4 times circles of photocatalytic H 2 production tests, the CoO x /Mn 0.3 Cd 0.7 S composite still keeps 92.0 % of the original photocatalytic activity. Considering its reasonable photochemistry stability and excellent photocatalytic activity for hydrogen evolution from H 2 O under with visible light excitation, the as-synthesized CoO x /Mn 0.3 Cd 0.7 S composite has potential applications in solar hydrogen production areas.
研究领域:
材料科学
·
能源化学
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产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Chen-Xuan Li,Wenhui Xu,Bai Li,Xiangyang Xu,Xian-Zhong Fu,Rui Deng,Feng Zhang,Yimin Sun,Kangping Cui
Waste cartons produced by e-commerce and the express delivery industry pose urgent environmental and social challenges, making their recycling a critical issue in recent years. In this study, a novel strategy for upcycling waste cartons into a Fenton-like chainmail catalyst, CoO x @C-P-8 (CoO x confined carbonaceous matrix), through a one-step pyrolysis process using waste cartons adsorbed cobalt nitrate was proposed. The catalytic activity of CoO x @C-P-8 in activating peroxymonosulfate (PMS) for the removal of tetracycline hydrochloride (TCH) was thoroughly evaluated. The results indicated that the combination CoO x @C-P-8 (0.3 g/L) and PMS (1.0 mM) could remove 92 % of TCH within 60 min. Mechanistic studies revealed that both singlet oxygen ( 1 O 2 ) and radicals (i.e. SO 4 •− , O 2 •− and HO • ) contributed to TCH removal, with cobalt-loading, N-doping, and the defective graphitic structure identified as the key governing factors. The unique chainmail structure of CoO x @C-P-8 endowed it with pronounced resistance to interference from ions (Cl − , NO 3 − , HCO 3 − , H 2 PO 4 − , K + , Mg 2+ , and Na + ) and pH variations (pH 3.0–11.0). Furthermore, the high environmental viability of CoO x @C-P-8, evidenced by ease of magnetic separation and simple catalyst regeneration, was demonstrated. This work may offer a feasible strategy for upcycling waste cartons and also contribute substantively to the advancement of wastewater decontamination.
研究领域:
环境科学
·
催化材料
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产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2023
·
IF 6.2
Chen Fang,Yanlan Wang,Wenkai Huang,Yingping Huang,Di Huang,Xiang Liu
Sulfite has recently been considered as the most potential alternative to peroxydisulfate and peroxymonosulfate for wastewater treatment because of its low ecotoxicity, low cost and abundant source. Although all sorts of homogeneous catalysts, such as Co 2+ , Cu 2+ , Fe 2+ , Mn 2+ , and so on, are developed for activating sulfites to generate SO 4 • − , it is of high significance to develop heterogeneous catalysts for wastewater treatment via sulfite activation. Herein, we have employed carbon nanosphere as an efficient support for CoO x nanoparticles on water decontamination via sulfite activation. The comparison with other carbon carriers (including carbon nanotubes and activated carbon) emphasized the vital role of CNS-600 in CoO x /CNS-600 for tetracycline (TC) degradation via Na 2 SO 3 activization. Because CNS-600 presented an uniform structure of nanosphere, with surface nitrogen and oxygen functional groups, which were favorable for Na 2 SO 3 activation and CoO x stabilization. This work proposes an efficient and heterogeneous Co-based nanomaterial for water decontamination via Na 2 SO 3 activization.
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Molecular Catalysis
·
2018
·
IF 0
Peipei Tao,Xinhuan Lu,Haifu Zhang,Run Jing,Fengfeng Huang,Sha Wu,Dan Zhou,Qinghua Xia
CoO x species is firstly introduced onto MOR (Mordenite) by impregnation with microwave heating to catalyze the epoxidation of α-pinene with air. The obtained samples have been characterized by X-ray diffraction, FTIR, SEM, TEM, BET surface area, porosity by N 2 adsorption. 7%CoO x /MOR catalyst exhibits remarkably higher activity and selectivity in the epoxidation of α-pinene than that prepared by traditional heating impregnation. The epoxidation conversion of α-pinene over 7%CoO x /MOR prepared by microwave heating reaches 92.7 mol% in 4 h at 90 °C, which is nearly 1.5 times that of the catalyst by traditional impregnation. This is due to the fact that CoO x nanoparticles are produced by microwave heating and uniformly dispersed on MOR.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
Molecular Catalysis
·
2023
·
IF 4.6
Ye Tian,Yunchao Feng,Zheng Li,Yi Fan,Jonathan Sperry,Yong Sun,Shuliang Yang,Xing Tang,Lu Lin,Xianhai Zeng
The selective hydrogenation of the C=O group in biomass-derivate furfural (FF) over noble metal-free catalysts is challenging in aqueous. Herein, a CoO x /Nb 2 O 5 nanostructure catalyst was synthesized for the hydrogenation of FF to furfuryl alcohol (FA). Under optimized conditions, a 95.7% yield of FA was obtained with a TOF of 155.7 h −1 , and the kinetic study revealed that the reaction followed a pseudo-first-order pathway with an activation energy of 39.42 kJ mol −1 . The catalyst characterization indicated the interaction between Nb 2 O 5 and CoO via the Nb-O-Co bond in CoO x /Nb 2 O 5 -ctr, which prevented the further reduction of CoO to metal Co in the catalyst's preparation process. The catalytic mechanism suggested CoO was the dominant hydrogenation/adsorption active, whilst Co 3 O 4 and Nb 2 O 5 assisted the adsorption of FF. Further, DFT calculations verified CoO was the main adsorption site for FF adsorption in CoO x /Nb 2 O 5 -ctr. Moreover, CoO x /Nb 2 O 5 -ctr showed outstanding recyclability for the selective hydrogenation of FF to FA ever after five runs. This work provides opportunities for the clean conversion of biomass-based FF to FA and infers potential applications of Co for the large-scale hydrogenation of bio-based platform chemicals.
研究领域:
化学工程
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催化化学
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生物质转化
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产品关联
DOI
高影响因子
Nanoscale
·
2017
·Vol. 9
·期 33
·11969-11975
·
IF 7.367
Dawei Chen,Chung-Li Dong,Yuqin Zou,Dong Su,Yu-Cheng Huang,Li Tao,Shuo Dou,Shaohua Shen,Shuangyin Wang
Electrocatalytic water splitting is a key technique to produce hydrogen fuels, which can be considered as an efficient strategy to store renewable energy. Oxygen evolution reaction (OER) that occurs at the anode side requires a four-electron transfer under highly oxidizing conditions. OER has a large overpotential and therefore determines the overall efficiency. Certain electrocatalysts can efficiently help to improve the reaction kinetics. Owing to the high cost of precious metals such as Pt, Ru, and Ir, non-precious metal oxide catalysts have been vigorously investigated under alkaline conditions. Herein, we synthesized novel highly dispersed amorphous CoOxfor the first time in the form of a cluster favorable to enhance the OER activity using a facile method via the air dielectric barrier discharge (DBD) plasma. Compared with the pristine biopolymer–cobalt complex, the amorphous CoOx cluster exhibits a much higher current density and a lower overpotential for OER, e.g., the overpotential of 290 mV at 10 mA cm−2 and the overpotential of only 350 mV at 300 mA cm−1. The excellent electrocatalytic OER activity was attributed to the unsaturated catalytic sites on the amorphous CoOx cluster. In addition, we studied the reaction mechanism, and it was observed that pure O2 DBD plasma could lead to the evolution of crystalline CoOx; however, the presence of N2 and O2 in DBD plasma could ensure the facile evolution of amorphous CoOx clusters. This study provides a new strategy to design amorphous materials for electrocatalysis and beyond.
研究领域:
材料科学
·
电化学
·
能源存储与转换
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产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Shuibo Wang,Chunzheng Wu,Hongbo Yu,Yuting Chu,Shiwei Wang,Tong Li,Hongfeng Yin
Tailoring the interface between active metals and promoters to improve catalytic performance is a challenging issue for bicomponent catalysts. Herein, we developed a series of silica supported Pt-CoO x hybrid nanocatalysts though in situ oxidation of supported bimetallic PtCo nanoparticles (NPs) with different Pt/Co ratios. Focusing on the hydrogenation of acetophenone to 1-phenylethanol as the model reaction, the obtained Pt-CoO x /SiO 2 catalysts showed superior activity and selectivity compared to Pt/SiO 2 , and the sample with a Co/Pt molar ratio of 1/3 performed the best. Our research showed that the CoO x on Pt not only changed its electronic and geometric properties, but also promoted the adsorption of reactants and the dissociation of H 2 . A further increase of the Co/Pt ratio to 1/1, however, reduced the activity due to blockage of the Pt surface.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2021
·
IF 3.882
Hongbo Yu,Jihao Zhao,Chunzheng Wu,Bo Yan,Shuangliang Zhao,Hongfeng Yin,Shenghu Zhou
Decoration of noble metals with transition-metal oxides has been intensively studied for heterogeneous catalysis. However, controllable syntheses of metal–metal oxide heterostructures are difficult, and elucidation of such interfaces is still challenging. In this work, supported IrCo alloy nanoparticles are transformed into supported Ir–CoOx close-contact nanostructures by in situ calcination and following selective reduction. Relative to Ir/Al2O3, Ir–CoOx/Al2O3 shows greatly enhanced activities for the hydrogenation of furfural derivatives to the corresponding furfuryl alcohol derivatives with more than 99% selectivity and demonstrates significantly improved activities and selectivity for hydrogenations of α,β-unsaturated aldehydes to α,β-unsaturated alcohols. The modification of Ir surfaces with CoOx prevents Ir nanoparticles from growing, achieving high thermal and catalytic stabilities. Theoretic calculation suggests that the better catalytic performance of Ir–CoOx/Al2O3 is ascribed to the Ir–CoOx interaction, which promotes the absorption of furfural as well as desorption of furfuryl alcohol, resulting in enhanced catalytic activities.
研究领域:
催化化学
·
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）