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利用“模板法”结合“真空干燥”技术制备出Ce-TiOx超细粒子,用XRD,TG-DSC,TEM等手段进行表征;以甲基橙溶液的光催化降解测试Ce-TiOx超细粒子的催化活性;考察初始物质的量比及热处理温度对Ce-TiOx超细粒子的结构及光催化活性的影响。结果显示:钛干凝胶经400℃热处理可得结晶度较高的锐钛矿型TiO2,800℃时TiO2转变为金红石相;Ce-Ti干凝胶经800℃热处理可得粒径约为45 nm的类球形颗粒;Ce-TiOx超细粒子中,钛以Ti3O5,Ti6O11,TiO2等多种形式存在,铈以CeO2和Ce7O12的形式存在;稀土铈影响Ce-TiOx超细粒子中钛的价态。
The ultrafine Ce-TiOx particles were prepared by “template method ” combined with “vacuum drying ” technology, and characterized by XRD, TG-DSC and TEM. The photocatalytic degradation of Ce-TiOx The catalytic activity of ultrafine particles was investigated. The effects of initial material ratio and heat treatment temperature on the structure and photocatalytic activity of Ce-TiOx ultrafine particles were investigated. The results show that the anatase TiO 2 with high crystallinity can be transformed into rutile phase at 800 ℃ by heat treatment at 400 ℃ for the titanium xerogels. The particle size of the Ce-Ti xerogel at 800 ℃ is about 45 nm spherical particles; Ce-TiOx ultrafine particles, titanium Ti3O5, Ti6O11, TiO2 and other forms exist, cerium CeO2 and Ce7O12 exist; rare earth cerium Ce-TiOx ultrafine titanium particles valence .