明胶对纳米二氧化钛相变和光催化活性的影响  

Effects of Gelatin on Phase Transformation and Photocatalytic Activity of Nano-size Titanium Dioxide

作　　者：田宝柱[1] 童天中[1] 陈锋[1] 张金龙[1] 

机构地区：[1]华东理工大学精细化工研究所结构可控先进功能材料及制备教育部重点实验室,上海200237

出　　处：《感光科学与光化学》2006年第2期93-101,共9页Photographic Science and Photochemistry

基　　金：国家自然科学基金(20577009);中国乐凯胶片集团公司资助项目

摘　　要：以明胶为分散剂采用溶胶-凝胶法制备了纳米晶TiO2粉末.通过XRD、TG-DTA、AFM、N2吸附-解吸等手段,考察了明胶对TiO2煅烧过程中相变和平均粒径的影响;用光催化降解甲基橙检测了明胶用量对样品光催化活性的影响.结果表明:明胶的存在抑制了TiO2由无定形向锐钛矿的相变,降低了锐钛矿向金红石的相变温度;同时,TiO2纳米晶的平均粒径也随明胶用量的增加而减小.600℃煅烧样品的光催化活性随明胶用量的增加而提高;800℃煅烧样品在mG∶mTBOT(明胶与钛酸四丁酯的质量比)=1∶8时,具有最高的光催化活性.Nanocrystalline TiO2 powders were prepared with gelatin dispersants by sol-gel method. The effects of gelatin on phase transformation and average particle sizes of nanocrystalline TiO2 during calcination were investigated by the means of XRD, TG-DTA, AFM, and N2 adsorption-desorption. Moreover, the effects of gelatin dosage on photocatalytic activity of samples were evaluated from an analysis of the photodegradation of methyl orange. The experimental results indicate that the gelatin has effects of inhibiting phase transformation from amorphism to anatase and decreasing the anatase-to-rutile transformation temperature, and the average particle size of nanocrystalline TiO2 deereases with increasing the gelatin dosage. The photocatalytic activity of samples calcined at 600 ℃ increases with increasing gelatin dosage. As for samples calcined at 800 12, the highest photocatalytic activity was obtained when znG： mTBT（mass ratio of gelatin to tetrabutyl titanate） = 1：8.

关 键 词：明胶 二氧化钛 相变 平均粒径 光催化活性 

分 类 号：O643.36[理学—物理化学] O644.1[理学—化学]