期刊
APPLIED SURFACE SCIENCE
卷 442, 期 -, 页码 298-307出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2018.02.147
关键词
Solvent polarity; TiO2 arrays; Photocatalysis; Low-temperature solvothermal synthesis
类别
资金
- National Basic Research Program of China (973 Program) [2014CB846003]
- Scientific Research Fund of the Sichuan Provincial Education Department [17ZB0448]
- Longshan Academic Talent Research Supporting Program of SWUST [17LZXY15]
Special TiO2 arrays with exposed facets were prepared in different solvents by low-temperature solvothermal synthesis. The morphology, phase and photocatalytic performance influenced by the various solvent polarities were characterized using field emission scanning electron microscopy, transmission electron microscopy, X-ray diffraction, Raman spectra and electrochemical testing. The results show that differences of solvent polarity are the main force driving differences in array growth; therefore, anatase TiO2 arrays with different crystal facets can be synthesized by tuning solvent polarity. TiO2 arrays prepared in cyclohexane are the best at oxidizing methyl orange through photocatalysis, followed by arrays prepared in toluene and ethanol. Arrays prepared in toluene are the best at reducing Cr(VI) photocatalytically, followed by those prepared in cyclohexane and ethanol. These differences in photocatalytic power are due to the ratio among the different crystal facets that are exposed, which affects the migration behavior of the photogenerated electrons and holes. In addition, the probable growth mechanisms of self- assembled ordered TiO2 arrays in different solvents are described. (C) 2018 Elsevier B.V. All rights reserved.
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