Simultaneous remediation of methylene blue and Cr(VI) by mesoporous BiVO4 photocatalyst under visible-light illumination
Autor: | Linli Long, Kaiqi Lai, Qiu Guoqiang, Huo Huiwen, Daixi Zhou, Xinjiang Hu, Qi Jin, Du Yuxuan, Hui Wang, Li Wenxuan, Xiyan Xu, Xiaofei Tan, Yaoyu Zhou, Chong Liang, Guangyu Xie |
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Rok vydání: | 2020 |
Předmět: |
Materials science
General Chemical Engineering chemistry.chemical_element 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences Oxygen 0104 chemical sciences Catalysis chemistry.chemical_compound Adsorption chemistry X-ray photoelectron spectroscopy Photocatalysis 0210 nano-technology Mesoporous material Methylene blue Visible spectrum |
Zdroj: | Journal of the Taiwan Institute of Chemical Engineers. 112:357-365 |
ISSN: | 1876-1070 |
DOI: | 10.1016/j.jtice.2020.05.014 |
Popis: | Porous photocatalysts with large surface areas are more photoactive than compact solid counterparts, owing to their larger surface areas and porous structure, which enhance the adsorption and confinement of light, thus improving the reaction between pollutants and photocatalysts. This paper reports the mechanisms involved in the enhanced photocatalytic activity of two kinds of porous BiVO4 catalysts, named p-BVO-1 and p-BVO-2, which are fabricated by a template-free and alcohol-hydrothermal method, respectively. Characterization, photoelectrochemical and optical measurements, reactive species detection, UV–vis, and XPS analyses were conducted. The results show that the introduction of oxygen vacancies and prolonging effect of light within the pore structure can enhance the photon response and charge separation and transfer, which help to elevate the photocatalytic performance. The simultaneous photocatalysis test of p-BVO-1 for methylene blue (MB) and Cr(VI) showed that the addition of Cr(VI) enhanced MB adsorption by forming an MB-Cr-MB complex, and MB promoted the photoreduction of Cr(VI) by scavenging h+ and ⋅O2−, which may oxidize Cr(III) to Cr(VI). The results indicate that ⋅O2− and h+ are mainly deployed to degrade MB, while e− reduces Cr(VI) ions, thereby favoring the separation of electron-hole pairs. |
Databáze: | OpenAIRE |
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