Co-Sol-Gel Preparation of SiO2-Doped TiO2 on Adsorption and Photocatalytic Degradation of Methyl Orange

Li Li Yang; Yan Liang Qu; Wen Jie Zhang

doi:10.4028/www.scientific.net/AMM.48-49.345

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 48-49Co-Sol-Gel Preparation of SiO2-Doped TiO2 on...

Co-Sol-Gel Preparation of SiO₂-Doped TiO₂ on Adsorption and Photocatalytic Degradation of Methyl Orange

Abstract:

A co-sol-gel method was used to prepare SiO2-doped TiO2. The amount of ethyl silicate added into the precursor, calcination temperature and time, adsorption equilibrium, and photocatalytic activity of the material were investigated as the factor of degradation efficiency. With the optimum composition of the precursor, the prepared gel calcinated at 500 oC for 3 h showed the highest photocatalytic activity. After 30 min stirring to reach adsorption equilibrium, adsorption contributed less than 2% to the total decoloration of methyl orange on the SiO2-doped TiO2 material. Photocatalytic methyl orange degradation continued with increasing irradiation time. Methyl orange degradation rates after 30 min and 100 min were 31.1% and 96.9%, respectively.