Preparation of Ti3+ self-doped TiO2 nanoparticles and their visible light photocatalytic activity

doi:10.1016/S1872-2067(14)60234-5

Abstract

Abstract:

Ti³⁺ self-doped TiO₂nanoparticles were synthesized by hydrothermal treatment of a gel precursor obtained using TiH₂ as the Ti source and H₂O₂ as oxidant. The effects of different states of gel and hydrothermal treatment time on the properties of the samples were studied. The structure, crystallinity, morphology, and optical properties of the nanoparticles were characterized by X-ray diffraction, transmission electron microscopy, high-resolution transmission electron microcopy, and UV-visible diffuse reflectance spectroscopy. The chemical states of Ti and O were confirmed by X-ray photoelectron spectroscopy and electron spin resonance spectroscopy. Methylene blue (MB) solutions were used as simulated wastewater to evaluate the visible-light photocatalytic activity of the samples. The samples exhibited strong absorption in the visible light region compared with pure TiO₂and an excellent performance in the photocatalytic degradation of MB. When yellow gel was used as the precursor, the sample obtained after hydrothermal treatment at 160 ℃ for 24 h exhibited the best visible light photocatalytic activity with a reaction rate constant of 0.0439 min^-1, 18.3 times that of pure TiO₂. The samples also showed excellent cyclic stability of the photocatalytic activity.

Key words: Ti³⁺self-doped, Titanium oxide, Gel, Hydrothermal method, Visible light photocatalysis

Xiaotong Wang, Yanmin Li, Xin Liu, Shanmin Gao, Baibiao Huang, Ying Dai. Preparation of Ti³⁺ self-doped TiO₂ nanoparticles and their visible light photocatalytic activity[J]. Chinese Journal of Catalysis, 2015, 36(3): 389-399.

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https://www.cjcatal.com/EN/Y2015/V36/I3/389

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Preparation of Ti³⁺ self-doped TiO₂ nanoparticles and their visible light photocatalytic activity

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