Effect of Sr-Ti Molar Ratio on Strontium Titanate Prepared by Sol-Gel Method

摘要

Tetrabutyl titanate and strontium nitrate were used as initial materials in a sol-gel process to prepare strontium titanate. The effects of strontium-titanium molar ratio on phase composition, structure and photocatalytic activity of the prepared materials were studied. The produced material was mainly composed of SrTiO3 and TiO2 when n(Sr)(Ti) ratio was less than 1:1, while the materials containing mainly Sr2TiO4 were prepared at n(Sr)(Ti) higher than 1:1. The particles of all the samples presented irregular shape with rough surface, along with partly particles aggregation. Phase composition of the produced materials showed strong dependence on n(Sr)(Ti) ratio. The sample prepared with n(Sr)(Ti) of 1:1 possessed the optimal photocatalytic activity of 32.5 % after 0.5 h of irradiation.