An active La/TiO2 photocatalyst prepared by ultrasonication-assisted sol–gel method followed by treatment under supercritical conditions
作者： Yuning Huo , Jian Zhu , Jingxia Li , Guisheng Li , Hexing Li
DOI: 10.1016/J.MOLCATA.2007.07.054
关键词: Sonication 、 Sol-gel 、 Supercritical drying 、 Photocatalysis 、 Adsorption 、 Chemistry 、 Calcination 、 Inorganic chemistry 、 Anatase 、 Supercritical fluid 、 Chemical engineering
摘要: A La-doped TiO2(La/TiO2) photocatalyst with optimum La/Ti molar ratio of 1.25% is prepared by ultrasound-assisted sol–gel method, followed supercritical drying in ethanol fluid. During liquid phase photocatalytic degradation phenol, the as-prepared La/TiO2 exhibits higher activity than obtained without ultrasonication. Meanwhile, via treatment more active either undoped TiO2 under conditions or direct calcination instead treatment. Based on various characterizations, promoting effects ultrasonication, treatment, and La-modification are discussed considering enhanced particle dispersion, crystallization degree anatase increase surface oxygen vacancies and/or defects, which facilitates adsorption phenol molecules also inhibits recombination between photoelectrons holes, resulting quantum efficiency photocatalysis. ultrasonication strengthen interaction La-dopants TiO2, could enhance light absorbance thus, activity.
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