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Rapid Preparation of Terbium-Doped Titanium Dioxide Nanoparticles and Their Enhanced Photocatalytic Performance

Rapid Preparation of Terbium-Doped Titanium Dioxide Nanoparticles and Their Enhanced Photocatalytic Performance

Zhencui Wang, Yuechao Song, Xingfei Cai, Jun Zhang, Tianle Tang, Shaobai Wen

R Soc Open Sci. 2019 Oct 9;6(10):191077.

PMID: 31824714

Abstract:

Further applications of photocatalysis were limited by the high recombination probability of photo-induced electron-hole pairs in traditional titanium dioxide nanoparticles (TiO2 NPs). Herein, we modified them with rare earth metal via a facile sol-gel method, using tetrabutyl titanate as a precursor and terbium (III) nitrate hexahydrate as terbium (Tb) source. The resulting samples with different Tb doping amounts (from 0 to 2%) have been characterized by X-ray diffraction, UV-visible diffuse reflectance spectroscopy, X-ray photo-electron spectroscopy and a scanning electron microscope. The photocatalytic performance of Tb-doped TiO2 was evaluated by the degradation of methylene blue. The effects of Tb doping amount and initial pH value of solution were investigated in detail. The composite with Tb doping amount of 1.0 wt% showed the highest photocatalytic performance. It exhibited approximately three times enhancement in photocatalytic activity with a reaction rate constant of 0.2314 h-1 when compared with that of commercial P25 (0.0827 h-1). In addition, it presented low toxicity on zebrafishes with 96 h-LC50 of 23.2 mg l-1, and has been proved to be reusable for at least four cycles without significant loss of photocatalytic activity. A probable photocatalytic mechanism of Tb-doped TiO2 was proposed according to the active species trapping experiments. The high photocatalytic performance, excellent reusability and low toxicity of Tb-doped TiO2 indicated that it is a promising candidate material in the future treatment of dye wastewater.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP13451199	Terbium(III) nitrate hexahydrate		13451-19-9	Price

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