ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Hao Wang,Yongqing Wang,Chunli Jiang,Kaihang Ye,Xiaohui He,Can Xue,Zujin Yang,Xiantai Zhou,Hongbing Ji
Herein, CuO/Bi2MoO6 hybrid nanosheets were prepared as a surface multifunctional photocatalyst for gas-phase toluene oxidation with high conversion (>99%). Aberration-corrected scanning transmission electron microscopy suggested that CuO species were highly dispersed on the nanosheets. X-ray absorption fine structure spectra indicated that the distorted and stretched Cu–O coordination structures in CuO/Bi2MoO6 nanosheets would provide open active sites. In situ Fourier transform infrared and density functional theory results showed that toluene molecules could be chemisorbed and activated on the active sites of CuO/Bi2MoO6 nanosheets by the C–H group forming CuO/Bi2MoO6···Ph-CH3 surface complex compounds. These would induce electron–hole transfer and initiate photocatalytic reactions under visible light irradiation. The corresponding intermediates of benzaldehyde and benzoic acid would be detected by in situ diffuse reflectance infrared Fourier transform spectroscopy. Furthermore, the synergistic effect of CuO and Bi2MoO6 nanosheets could monitor charge dynamics to facilitate their respective transmission from photoexcitation sites to active centers. This work provides new insights into the essence of visible-light-driven surface photocatalysis and is expected to promote the design of novel and more effective photocatalysts at the molecular level.
研究领域:
材料科学
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环境科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2018
·
IF 4.521
Ting Yi,Yibo Zhang,Xiangguang Yang
Pt@CeO 2 /MCM-56 (PCM) and CeO 2 -CuO (9:1)/MCM-56 (CCM) were combined to purify the exhaust emissions from diesel vehicles in three configuration statuses, defined as configuration A—where CCM stays above PCM, configuration B—where PCM stays above CCM, and configuration C—where CCM mixes with PCM homogeneously in loose contact. Among these combined catalysts, the configuration A is most favorable for the selective catalytic reduction (SCR) reaction, with >80% NO x conversion obtained at the temperature range of 150–550 °C and gas hourly space velocity (GHSV) of 240,000 ml g −1 h −1 . NH 3 -TPD, H 2- TPR and NH 3 conversion measurements demonstrated that NH 3 can be selectively used to reduce NO x in the configuration A but is over-oxidized if the reaction is operated in configuration B or configuration C status, deteriorating the deNO x activity at temperature above 250 °C. Hence, configuration A not only takes advantage but also overcomes the shortcomings of PCM and CCM, leading to high NO x conversion and N 2 selectivity. A significant decrease in the onset temperature of soot combustion was also observed in this research.
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Ruoming Tong,Rui Fu,Zhe Yang,Yuanxing Jiang,Kun Jiang,Xuhui Sun
In this work, CuO-Al 2 O 3 composites were synthesized at higher temperatures to control the leaching of metal ions , which can activate sulfite (S(IV)) to degrade organic contaminants by generating reactive oxygen species (ROSs). The synthesized catalysts were characterized by X-ray diffraction, scanning electron microscopy, high-resolution transmission electron microscopy , Brunauer-Emmett-Teller, Raman spectroscopy , and Fourier transform infrared spectrophotometry . Sulfachloropyridazine (SCP) was almost completely removed (＞99%) at pH 6.8, and the leaching amount of Cu accounted for 0.027% of the total amount of Cu after the reaction. Notably, singlet oxygen ( 1 O 2 ) was found for the first time in the activated sulfite system, which removed organic pollutants together with sulfate (SO 4 •- ) and hydroxyl (∙OH) radicals. And Al 2 O 3 plays an important role in the catalyst, including anti-sintering, reducing the leaching of copper ions , and promoting the generation of oxygen vacancies. Based on the types of ROSs and X-ray photoelectron spectroscopy results, a possible ROSs generation mechanism was proposed. In addition, the stability of the catalyst and the effect of different factors on the degradation of SCP, including operating parameters and water quality, were further investigated. The intermediates were detected by using gas chromatography-mass spectrometry and a developmental toxicity assessment of the intermediates was defined based on the Toxicity Estimation Software Tool (TEST). Overall, this paper not only provides a new strategy for sulfite activation but also promotes more attention to non-radical processes in activated sulfite systems.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Yuan Zhang,Dong Wang,Gaili Liu,Yongjia Xiang,Kun Wang,Shaomin Shuang,Chuan Dong
2-Mercaptobenzothiazole (MBT) poses an unignorable risk to the aquatic environment and human health. Traditional analysis and prevention methods are unsuitable for broader applications due to their complexity and high-cost instruments. To address these challenges, a novel CuO@MnO 2 (CM) nanozyme has been designed to establish absorbance-colorimetric dual-mode sensing and modulate the content of MBT through reactive oxygen species (ROS) mediated oxidative degradation . CM nanozyme exhibits notable catalytic ability with K m 13.6 μM and V max 0.763 μM/s. Furthermore, by integrating the generated 1 O 2 , O 2 •- and •OH in the presence of O 2 , the absorbance and colorimetric method for MBT sensing is developed, offering a linear detection range from 0.1 to 15 μM through the color change of 3,3′,5,5′-tetramethylbenzidine (TMB) and TMBox. Besides, the CM nanozyme can oxidatively decompose MBT, significantly reducing its biotoxicity without needing photocatalytic auxiliary equipment. This work presents a promising MBT detection and degradation approach in future applications.
研究领域:
环境科学
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生物化学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Tingxiang Chen,Liugen Zhang,Jiang Li,Changyan Guo,Shanshan Qiao,Yansong Zhao,Jide Wang
This paper introduces a facile method to develop core-shell nanocomposite Cu/(Cu 2 O/CuO) through gradually oxidation on Cu nanocomposite precursors. As-prepared catalyst exhibited excellent catalytic activity in the reaction of water oxidation reaction (WOR). Comparing with the reported catalyst, Cu/(Cu 2 O/CuO) posed one of the highest O 2 evolution around 7700 μmol g -1 ·h -1 . By analyzing the composition of catalysts in each reaction stages, the evolution pathway of Cu towards Cu 2 O/CuO and the different roles of each component in catalytic water oxidation reactions were deeply studied. In presence of high conductive Cu element and excellent light absorption Cu 2 O, the photo generated electron and holes can be effectively separated and greatly improve the efficiency of the catalyst. The evolution process and synergistic effects of the three components play a crucial role in improving photocatalytic efficiency, which promoting the nanocomposite to be a highly efficient core-shell catalyst for WOR.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Dong Wang,Rong Tan,Haibo Yu,Hong Chen,Xiao Ma,Huizhang Zhao,Xingyu Kang,Hairui Fang
Real-time monitoring of toxic and harmful hydrogen sulfide (H 2 S) is crucial in the extraction process of fossil fuels. However, in the process of detecting H 2 S, there will be difficulties in desorption, low response, poor anti-interference ability, and poor long-term stability. The multidimensional copper oxide (CuO) composite cerium oxide (CeO 2 ) was synthesized by hydrothermal method and calcination techniques, and a gas sensor with easy desorption, high response, strong anti-interference ability, and excellent long-term stability for monitoring H 2 S was effectively prepared. Through various characterization tests such as X-ray diffraction (XRD) and scanning electron microscope (SEM), it was found that the composite material has multidimensional characteristics. When detecting 100 parts per million (ppm) of H 2 S at the optimal operating temperature of 180℃, the CuO/CeO 2 gas sensor with the optimal ratio (n Cu : n Ce =1:1) showed an extremely high response (2010). At the same time, the gas sensor has extremely strong anti-interference ability and excellent long-term stability. In addition, these excellent H 2 S sensing properties are attributed to the excellent oxygen storage characteristics of CeO 2 and the synergistic effect of CuO and CeO 2 . This provides more active sites for the absorption of H 2 S. Finally, to achieve real-time monitoring and alarm of H 2 S, a portable real-time monitoring and alarm device was made. When detecting different concentrations of H 2 S, it will flash corresponding color lights and give an alarm to achieve the monitoring function and ensure the safety and health of workers. The multi-dimensional CuO/CeO 2 prepared has excellent gas sensing performance, providing a new method for H 2 S detection.
研究领域:
材料科学
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传感器技术
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环境监测
✓ 已验证
DOI
高影响因子
STAR Protocols
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2024
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IF 1.3
Xinze Du,Yumei Liu,Xiaojun Shen
Summary Phenolic chemicals are important building blocks in chemical and material industries. In this protocol, we describe the preparation of CeO 2 -CuO catalysts and the application in the decarboxylative oxidation reaction of benzoic acids to phenols. Furthermore, we describe how to modify the basic sites of CeO 2 -CuO catalysts by CO 2 treatment to increase the selectivity of phenol and the regeneration process of used catalyst. For complete details on the use and execution of this protocol, please refer to Du et al. (2023). 1
研究领域:
催化
·
有机化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Shi-Yuan Zhang,Hong-Lin Zhu,Yue-Qing Zheng
Transition metal oxides with hierarchical structures that grow on conductive substrates directly, which have been considered as promising catalysts for electrochemical catalysis. In this study, we used a stepwise synthesis method to prepare CuO nanoflake @Co 3 O 4 nanowire composite nano-arrays (denote as CuO/Co 3 O 4 composite), which show an excellent electrochemical performance. In the oxygen evolution reaction (OER), the CuO/Co 3 O 4 composite shows lower overpotential of 450 mV at the current density of 50 mA cm −2 and a smaller Tafel slope of 42 mV dec −1 in KOH solution (1 M, pH = 13.7). In the electrocatalytic CO 2 reduction reaction, the prepared CuO/Co 3 O 4 composite showed better CO selectivity in KHCO 3 aqueous solution (0.1 M, CO 2 saturated), the corresponding Faradaic efficiency of CO product reached 35.4%, and the product ratio of H 2 to CO was controlled by changing the potential values. The synthesis strategy reported here opens a way for designing high-performance electrodes for electrochemical catalysis and also provides new ideas for the construction of overall reaction (CO 2 + H 2 O → CO + O 2 ).
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2020
·Vol. 49
·期 27
·9274-9281
·
IF 4.174
He Li,Yu Zou,Jiang Jiang
Ag and CuO in the form of nanoparticles have been widely used in our daily life as antibacterial agents, through releasing Ag ions and generating reactive oxygen species (ROS). In this work, we demonstrate that by synthesizing Ag@CuO nanohybrids with core–shell configurations, their bactericidal activity can be synergistically enhanced compared to the respective constituents. Upon AM 1.5G light illumination for short durations, the measured minimum inhibitory concentrations of the Ag@CuO nanohybrids show a significant decrease against both Gram-negative Escherichia coli and Gram-positive Staphylococcus aureus bacterial strains, requiring only 7% and 34% of those when conducted in the dark. The spread plate results demonstrate that with nanohybrid concentrations of 11.0 and 21.9 mg L−1, at least 7 orders of magnitude decrease in Escherichia coli and Staphylococcus aureus colony forming units is achieved, when the Ag@CuO nanohybrids are exposed to light illumination for 10 min. The effect of illumination is found to induce Ag+ release and enhance 1O2 generation, which act concertedly to facilitate the remarkable photo-enhanced bactericidal effect.
研究领域:
材料科学
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Jiangdong Dai,Zhongshuai Chang,Atian Xie,Ruilong Zhang,Sujun Tian,Wenna Ge,Yongsheng Yan,Chunxiang Li,Wei Xu,Rong Shao
The research of superhydrophilic interface is developing rapidly, but the preparations of superhydrophilic surfaces through simple methods are still challenging. Herein, we reported a facile, rapid and environmentally-friendly approach for preparing a novel superhydrophilic and underwater superoleophobic membrane via the thermal oxidation of Cu mesh and one-step coordinated assembly of Fe(III)-CMC chelate hydrogel. Superhydrophilicity was attributed to the hydrophilicity of Fe(III)-CMC chelate hydrogel and nanoneedle-like rough structure of CuO@Cu membrane. The membrane was used to separate a variety of oil/water mixtures and exhibited excellent separation performance. Moreover, the membrane exhibited the excellent durability and superior stability against corrosion conditions. We envision that the Fe(III)-CMC@CuO@Cu membrane with good underwater superoleophobicity could provide a candidate not only for oil/water separation but also many other potential applications such as underwater oil manipulation, self-clean, and bio-adhesion control.
研究领域:
材料科学
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环境科学
·
界面化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Xiurong Zhu,Zhenxin Wang,Wenjing Xie,Wei Yan,Haijiang Lian,Pengkang Jin,Gen Wang
Transition metal oxides have been recently investigated as excellent catalyst for peroxydisulfate (PDS) activation, but suffers from slow redox cycle of metal species. In this work, a novel avenue for facilitating valence cycles of Cu 2+ /Cu + was proposed by overturned doping inert Ce into mesoporous CuO. Increased formation of active sites (Cu-Ce interface) and oxygen vacancy was achieved, resulting in accelerated interfacial electron transfer and facilitated valence cycles of Cu 2+ /Cu + . The Ce-doped mesoporous CuO (CeCuO x ) exhibited greatly enhanced activity toward PDS activation and efficient removal of different bisphenols in a wide pH working range. The degradation of bisphenols followed a nonradical oxidation pathway based on electron transfer process (ETP), and CeCuO x @PDS complex was proved to be the primary reactive species. The CeCuO x /PDS system exhibited good stability and superior catalytic performance in complicated water matrix, and would be a promising catalyst for wastewater purification. This work provides a new prospect for boosting the redox behavior of metal active sites for environmental remediation.
研究领域:
环境科学
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催化
·
水处理
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Sustainability
·
2025
·
IF 7.9
Pengyuan Guan,Yongjie Zhao,Yihui Wu,Weixian Li,Xiao Zhang,Xiang Gao,Xiaoxia Ou,Wai Siong Chai,Yinfeng He,Hao Nan Li
CuO–ZnO–ZrO 2 catalyst attracted significant attention for CO 2 hydrogenation to methanol. Gyroid-based triply period minimal surface lattice structures feature highly ordered porous networks, which could be used to enhance catalytic performance and efficiency. This paper presents a formulating and one-step calcination strategy that united the removal of polymer resin and calcination of catalyst precursor at one temperature. This enabled 3D printing gyroid-structured CuO–ZnO–ZrO 2 catalyst for CO 2 hydrogenation while minimizing the impact of overheating on the catalyst performance. A photocurable formulation loaded with CuO–ZnO–ZrO 2 precursor was developed. Using the optimized formulation, gyroid structures with varying pore sizes were successfully printed and calcined. The optimal lattice wall thickness that balances porosity and structural stability was identified. The results indicate that the resin used for 3D printing was successfully removed at a lower temperature and the catalytic activity of the 3D-printed structured catalyst was retained through the one-step calcination process while the gyroid lattice geometry can enhance catalytic efficiency than cylindrical structure.
研究领域:
材料科学
·
催化化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）