Effect of Calcination Temperature on Crystal Structure and Photocatalytic Property of TiO2/Diatomite Nanoparticles

doi:10.3724/SP.J.1077.2014.13330

Abstract

Abstract: TiO₂/diatomite photocatalysts were synthesized by a facile Sol-Gel method using diatomite as supporter and tetrabutyl titanate (TBOT) as precursor. The crystalline and morphological properties of catalysts with different calcination temperatures were characterized by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM) and UV-Vis spectroscopy. Results reveal that the crystallite size becomes larger and the anatase phase transforms to the rutile phase at elevated temperature. Compared with unimmobilized TiO₂, the diatomite supporter impedes the transformation and prevents nano-TiO₂ particles from aggregation. The effect of calcination temperature on photocatalytic reactivities of these catalysts was investigated by UV-assisted degradation of 10 mg/L Rhodamine B (RhB). The sample calcined at 750℃ exhibits significantly enhanced reactivity with the removal rate of RhB up to about 100% after irradiation for 120 min, equivalent to that of Degussa P25 under similar conditions. The highest photocatalytic activity is observed in TiO₂/diatomite calcined under 750℃ which can be attributed to the presence of anatase and rutile phases in an appropriate ratio at 9:1.

Key words: diatomite, TiO₂, crystallization, photocatalysis

CLC Number:

TD98

WANG Bin, ZHANG Guang-Xin, ZHENG Shui-Lin, LIU Ze-Yu. Effect of Calcination Temperature on Crystal Structure and Photocatalytic Property of TiO₂/Diatomite Nanoparticles[J]. Journal of Inorganic Materials, 2014, 29(4): 382-386.

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Effect of Calcination Temperature on Crystal Structure and Photocatalytic Property of TiO₂/Diatomite Nanoparticles

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