CHEMOSPHERE
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2022
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IF 8.943
Vasanthakumar V,Murad Alsawalha,Thamer Alomayri,Saud Allehyani,Yi-bo Hu,Ming-Lai Fu,Baoling Yuan
A novel composite of multiwall carbon nanotube (MWCNT) supported V 2 O 5 quantum dots decorated Bi 2 O 3 hybrid was prepared by the simple wet-impregnation method, and the photocatalytic performance of the prepared samples was investigated against the photodegradation of ciprofloxacin (CIP). Herein, different samples of pristine, V 2 O 5 /Bi 2 O 3 and MWCNT@V 2 O 5 /Bi 2 O 3 hybrid photocatalyst were prepared and systematically characterized by various physicochemical techniques. The characterization results demonstrated that the introduction of MWCNT can change the energy band gap of V 2 O 5 /Bi 2 O 3 , and the band energies vary with a constituent of MWCNT@V 2 O 5 /Bi 2 O 3 catalyst, in which MWCNT@V 2 O 5 /Bi 2 O 3 -5 (0.05 g@0.50 g:0.50 g) has the optimal band gap energy of 2.46 eV. The photocatalytic test demonstrates that the MWCNT@V 2 O 5 /Bi 2 O 3 -5 hybrid composites exhibited enhanced photocatalytic activity in CIP degradation compared to that pure and other photocatalyst and its degradation efficiency did not decrease significantly even after five cyclic experiments. The enhanced photocatalytic activity was due to the formation of heterojunction among MWCNT, V 2 O 5 and Bi 2 O 3 , which distinctly improved the separation efficiency of the photogenerated charge carrier, thus increasing the degradation performance. This work gives a new approach to designing an efficient photocatalyst for contaminants degradation.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
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2020
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IF 4.473
Zhongkai Xie,Yuyan Xu,Di Li,Suci Meng,Min Chen,Deli Jiang
The highly efficient spatial carrier separation and abundant active sites are significant for CO2 photocatalytic reduction efficiency. Herein, an ultrathin Bi2O3 nanosheet/Bi2WO6 network heterostructure is successfully synthesized via a covalently bonded epitaxial growth strategy. Due to cosharing of the Bi–O tetrahedron between Bi2O3 and Bi2WO6, this heterostructure exhibits a compact interface, which can provide a highway for the charge transfer and then boost their separation. Moreover, the pores generated from the hierarchical structure afford abundant exposed photocatalytic active sites. Thus, the optimal Bi2O3/Bi2WO6 heterostructure (BOBWO-12) shows superior photocatalytic performance for CO2 reduction with an ultrahigh selectivity as well as the removal of RhB. Notably, the photocatalytic CO generation rate over BOBWO-12 reaches up to 17.39 μmol·g–1·h–1, which is 18.0 and 4.2 times higher than that of bulk-Bi2WO6 and Bi2WO6 nanosheets, respectively, and the selectivity is of about 95.4%. Moreover, the Bi2O3/Bi2WO6 heterostructure also exhibits improved long-term stability, resulting from the firm heterointerface. Our studies present a conventient avenue to construct a high-efficiency heterostructure photocatalyst with a firm interface by the covalently bonded epitaxial growth method for CO2 reduction.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
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2019
·Vol. 10
·期 1
·1-8
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IF 11.878
Chen Shichuan,Wang Hui,Kang Zhixiong,Jin Sen,Zhang Xiaodong,Zheng Xusheng,Qi Zeming,Zhu Junfa,Pan Bicai,Xie Yi
The photofixation and utilization of CO 2 via single-electron mechanism is considered to be a clean and green way to produce high-value-added commodity chemicals with long carbon chains. However, this topic has not been fully explored for the highly negative reduction potential in the formation of reactive carbonate radical. Herein, by taking Bi 2 O 3 nanosheets as a model system, we illustrate that oxygen vacancies confined in atomic layers can lower the adsorption energy of CO 2 on the reactive sites, and thus activate CO 2 by single-electron transfer in mild conditions. As demonstrated, Bi 2 O 3 nanosheets with rich oxygen vacancies show enhanced generation of •CO 2 – species during the reaction process and achieve a high conversion yield of dimethyl carbonate (DMC) with nearly 100% selectivity in the presence of methanol. This study establishes a practical way for the photofixation of CO 2 to long-chain chemicals via defect engineering.
研究领域:
化学
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材料科学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2021
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IF 4.527
Hao Ma,Sue Yang,Meng li,Xiaoning Tang,Zhenhao Xia,Rong Dai
Effective and safe application of antibacterials has always been an important aspect for their usage. High-efficiency photocatalytic technology driven by visible light for antibacterial action constitutes a practical solution for antibacterial agents and will not harm the human body or the environment. While most studies on β-Bi 2 O 3 materials with good photocatalytic properties under visible light are conducted in the field of optoelectronics , their potential and mechanism as photocatalytic antibacterial agents have not yet been fully explored. Herein, we report the performance of sheet-like metastable β-Bi 2 O 3 material with rich oxygen vacancies and high electron-hole separation efficiency in antibacterial processes, as well as a preliminary exploration of its antibacterial mechanism. The results revealed that the antibacterial activity of the product against E. coli greatly improved in comparison with commercially available α-Bi 2 O 3 owing to its excellent structure and optical properties . In addition, gradient experiments and scavenger experiments have confirmed that the main antibacterial effect of β-Bi 2 O 3 originates from reactive oxygen species (ROS), and the superoxide radical, ·O 2 − , of generated ROS is the key reactive species in the antibacterial process. Through the detection of lipid peroxidation and bacterial respiratory-chain dehydrogenase activity, several pathways were identified for the excellent antibacterial activity of the product.
研究领域:
材料科学
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纳米技术
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光催化
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抗菌技术
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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）