Differently ordered TiO2 nanoarrays regulated by solvent polarity, and their photocatalytic performances
| Autor: | Faqin Dong, Huichao He, Dingming Yang, Mingxue Liu, Yadong Wu, Wenyuan Hu, Hongquan Deng, Jing Zhang |
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| Rok vydání: | 2018 |
| Předmět: |
Anatase
Materials science Cyclohexane Solvothermal synthesis General Physics and Astronomy 02 engineering and technology Surfaces and Interfaces General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films Solvent chemistry.chemical_compound symbols.namesake Chemical engineering chemistry Transmission electron microscopy Methyl orange symbols Photocatalysis 0210 nano-technology Raman spectroscopy |
| Zdroj: | Applied Surface Science. 442:298-307 |
| ISSN: | 0169-4332 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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