Fabrication of TiO2 hollow microspheres using K3PW12O40 as template

doi:10.1016/S1872-2067(15)60987-1

Abstract

Abstract:

Fabrication of TiO₂ hollow microspheres (TiO₂-HMSs) has attracted considerable attention owing to their low density, high photoreactivity, and easy to separate and reuse. A fluoride-free method for the fabrication of TiO₂-HMSs is reported by refluxing a mixed solution of H₃PW₁₂O₄₀ (0.4 mmol), KCl (2.5 mmol) and Ti(SO₄)₂ (2-25 mmol) at 125 ℃ for 8 h, followed by decomposition of the K₃PW₁₂O₄₀ (KPW) template in basic solution. The prepared TiO₂-HMSs are characterized by X-ray diffraction, transmission electron microscopy, scanning electron microscopy, Fourier transform infrared spectroscopy, ultraviolet-visible diffuse reflectance spectroscopy and X-ray photoelectron spectroscopy. The activities of the photocatalysts are evaluated by photocatalytic degradation of Brilliant Red X-3B, an anionic dye, under UV irradiation. It is observed that the TiO₂-HMSs exhibit diameters of approximately 0.5-1 μm, and the photocatalytic activity of TiO₂-HMSs initially increases and then decreases with an increasing amount of Ti(SO₄)₂. The TiO₂-HMSs prepared in the presence of 4 mmol Ti(SO₄)₂ exhibit the highest photocatalytic activity, which is 2.1 times higher than TiO₂ nanoparticles (prepared in the absence of the KPW template). The enhanced photocatalytic activity of the prepared TiO₂-HMSs is ascribed to the improved crystallization, coupling effect between TiO₂ and the residual KPW template, and the unique hollow structures of TiO₂-HMSs.

Key words: Titania, Hollow microsphere, K₃PW₁₂O₄₀, Template, Degradation

Junfeng Lan, Xiaofeng Wu, Kangle Lü, Lingling Si, Kejian Deng. Fabrication of TiO₂ hollow microspheres using K₃PW₁₂O₄₀ as template[J]. Chinese Journal of Catalysis, 2015, 36(12): 2237-2243.

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https://www.cjcatal.com/EN/Y2015/V36/I12/2237

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Fabrication of TiO₂ hollow microspheres using K₃PW₁₂O₄₀ as template

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