Photocatalytic degradation of selected dyes by titania thin films with various nanostructures |
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Authors: | Xiao-Mei Song Mi Yan |
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Affiliation: | a Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, PR China b State Key Lab of Silicon Materials, Zhejiang University, Hangzhou 310027, PR China |
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Abstract: | Titania thin films with various nanostructures of quasi-aligned nanorods, well-aligned nanotubes and nanoparticle aggregates were fabricated and utilized to assist photodegradation of three typical dye derivatives in water, i. e., rhodamine B (RB), methylene blue (MB) and methyl orange (MO). The thin films were characterized by X-ray diffraction, scanning electron microscope and UV-Vis diffuse reflectance spectra. It is found that the bandgap of most lab-fabricated thin films can be estimated more appropriately assuming a direct transition between the valance band and the conduction band of titania. The so-called natural ageing phenomenon was evidence for all the films to assist photodegradation of RB and MB in water; but not discernible for MO, which was much reluctant to photodegradation. MB decomposed much quickly than RB when assisted by titania with predominantly anatase; on the other hand, rutile favored the photodegradation of RB than that of MB. Titania thin films with top morphologies of quasi-aligned nanorods or nanotubes were found to possess advantageous turnover frequency and photonic efficiency over commercial P25 titania and sol-gel derived titania to assist photodegradation of RB and MB in water. |
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Keywords: | Titanium dioxide Photocatalysis Dyes Thin films X-ray diffraction Surface topography Scanning electron microscopy |
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