Abstract: The title Nano-photocatalysts emulsion was prepared using TosO as the precursor by ambi-ent hydrolysis -precipitation and hydrothermal method. The influence of pH value, stabilizer, oxidant, tem-perature and time of heat treatment, on photocatalytic performance of nano-photocatalyst emulsion were investigated. Nano TiO₂ particles in the emulsion were found by use of XRD and TEM an anatase phase and its average size was 10 nm. The results from the photocatalytic degradation shows that the optimum products have been obtained when the pH value of photocatalyst emulsion was 8, with citric acid as the stabilizer,and heated in100℃for6h.

Key words: Nano-TiO₂, photocatalytic degradation, hydrothermal-precipitation

摘要： 以硫酸氧钛为原料通过常温水解沉淀及水热处理制备了纳米光触媒乳液。考察了水解 ｐＨ值、稳定剂、氧化剂、热处理温度及热处理时间等条件对该乳液的光催化性能的影响。ＸＲＤ和 ＴＥＭ检测结果表明：光触媒乳液中纳米 ＴｉＯ_２颗粒晶体结构为锐钛型，平均粒径为 １０ｎｍ。光催化活性评价表明：当水解溶液的 ｐＨ值 ＝８，以柠檬酸为稳定剂，在 １００℃下水热处理 ６ｈ后获得的纳米光触媒乳液具有最佳光催化活性。

关键词: 纳米 ＴｉＯ_２, 光催化降解, 水热沉淀法