Effects of crystallinity, {001}/{101} ratio, and Au decoration on the photocatalytic activity of anatase TiO2 crystals

doi:10.1016/S1872-2067(18)63174-2

Abstract

Abstract:

Anatase TiO₂ nanocrystals and sub-microcrystals with truncated octahedral bipyramidal morphologies were prepared by direct calcination of TiOF₂ precursors. The as-prepared TiO₂ samples were thoroughly characterized by X-ray diffraction, Raman spectroscopy, field-emission scanning electron microscopy, N₂ adsorption-desorption isotherms, X-ray photoelectron spectroscopy, and UV-visible diffuse spectroscopy. It was found that the crystallinity, grain size, and {001}/{101} ratio of the samples can be increased by raising the calcination temperature from 500 to 800℃. The higher crystallinity and {001}/{101} facet ratio resulted in an increase in both aqueous and gas-phase photocatalytic activities, by inhibiting the recombination and separation of electrons and holes. After selecting two TiO₂ samples with high crystallinity and {001}/{101} ratio, Au nanoparticles were decorated on their surfaces, and the photocatalytic activity of the resulting samples under visible light illumination was studied. It was found that the visible light-induced photocatalytic activity increased by 2.6 and 4.8 times, respectively, upon Au decoration of the samples prepared by calcination of TiOF₂ at 700 and 800℃.

Key words: High crystallinity, Anatase TiO₂, High energy facets, Au decoration, Photocatalysis

Jiangyan Wang, Baoshun Liu, Kazuya Nakata. Effects of crystallinity, {001}/{101} ratio, and Au decoration on the photocatalytic activity of anatase TiO₂ crystals[J]. Chinese Journal of Catalysis, 2019, 40(3): 403-412.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(18)63174-2

https://www.cjcatal.com/EN/Y2019/V40/I3/403

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Effects of crystallinity, {001}/{101} ratio, and Au decoration on the photocatalytic activity of anatase TiO₂ crystals

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