A novel approach for the preparation of phase-tunable TiO2 nanocomposite crystals with superior visible-light-driven photocatalytic activity

doi:10.1016/S1872-2067(12)60574-9

Abstract

Abstract:

A series of novel TiO₂ nanocomposite crystals with superior visible-light-driven photocatalytic activity were successfully prepared using a soft chemical solution process involving direct reaction of aqueous H₂O₂ with a 2-ethoxyethanol solution of tetraisopropyl titanate before calcination of the resulting peroxo-titanium complexes at 500℃ for 4 h. The synthesized TiO₂ samples are composed of anatase and rutile phases, and the ratio of rutile could be continuously tuned from 0 to 96% by altering the 2-ethoxyethanol volume. There are clear red-shifts in the UV-Vis absorption spectra and apparent band gap narrowing for the synthesized TiO₂ in comparison with Evonik P-25. The synthesized TiO₂ samples are found to be much more efficient for methylene blue degradation under visible-light irradiation. The optimized sample (2-ethoxyethanol: 5 ml; rutile in bulk: 46%) exhibits 5-fold higher adsorption capacity and 3-fold higher photocatalytic activity than those of Evonik P-25 (λ ≥ 400 nm). Characterizations including X-ray diffraction and Raman spectroscopy reveal that the surface of the optimized TiO₂ sample only contains a small quantity of rutile. It is concluded that the surface phase composition and distribution of the TiO₂ nanocomposite crystals are essential to their greatly enhanced photocatalytic activities and strong adsorption capacities. In addition, the concentration of defects existing in the synthesized TiO₂ is also regarded to account for these enhanced properties.

Key words: Chemical solution process, Titanium oxide, Nanocomposite crystal, Phase modulation, Visible light, Photocatalysis, Adsorption capacity

YU Fuhai, WANG Junhu, ZHAO Kunfeng, YIN Jie, JIN Changzi, LIU Xin. A novel approach for the preparation of phase-tunable TiO₂ nanocomposite crystals with superior visible-light-driven photocatalytic activity[J]. Chinese Journal of Catalysis, 2013, 34(6): 1216-1223.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(12)60574-9

https://www.cjcatal.com/EN/Y2013/V34/I6/1216

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A novel approach for the preparation of phase-tunable TiO₂ nanocomposite crystals with superior visible-light-driven photocatalytic activity

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