Strong visible absorption and excellent photocatalytic performance of brown TiO2 nanoparticles synthesized using one-step low-temperature process

doi:10.1016/S1872-2067(17)62855-9

Abstract

Abstract:

We report a facile and modified sol-gel approach to synthesize brown TiO₂ nanoparticles at low temperature (100-600℃). The TiO₂ nanoparticles dried at 180 ℃ (TiO₂-180℃) possessed a small particle size (5.0 nm), large specific surface area (213.45 m²/g), and efficient response to broadband light over the entire ultraviolet-visible spectrum with a narrow band gap of 1.84 eV. In addition, TiO₂-180℃ exhibited the optimal reaction rate constant for the degradation of methylene blue (0.08287 mg/(L·min)), which is six times higher than that of the mixed rutile/anatase phase TiO₂ photocatalytic standard P25 (0.01342 mg/(L·min)). Furthermore, cycling photodegradation ex-periments confirmed the stability and reusability of this catalyst. The unique physicochemical properties resulting from the low-temperature preparation of TiO₂-180℃, including its broadband visible absorption associated with a high concentration of oxygen vacancies, large surface area, and enriched surface -OH/H₂O may be responsible for this excellent photocatalytic performance. The use of as-prepared TiO₂-180℃ for practical applications is expected after further optimization.

Key words: Titanium dioxide, Visible light, Broadband absorption, Oxygen vacancy, Photocatalytic degradation

Ting Wang, Wanwen Li, Dandan Xu, Xuanmin Wu, Liwei Cao, Jianxin Meng. Strong visible absorption and excellent photocatalytic performance of brown TiO₂ nanoparticles synthesized using one-step low-temperature process[J]. Chinese Journal of Catalysis, 2017, 38(7): 1184-1195.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(17)62855-9

https://www.cjcatal.com/EN/Y2017/V38/I7/1184

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Strong visible absorption and excellent photocatalytic performance of brown TiO₂ nanoparticles synthesized using one-step low-temperature process

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