化学包覆法制备TiO_2/SiO_2复合物  

Preparation of TiO_2/SiO_2 composite by chemical coating method

作　　者：姚志通[1,2] 夏枚生[1] 叶瑛[1] 

机构地区：[1]浙江大学海洋科学与工程学系,杭州310028 [2]清华大学环境科学与工程系,北京100084

出　　处：《粉末冶金材料科学与工程》2010年第5期474-478,共5页Materials Science and Engineering of Powder Metallurgy

基　　金：国家高新技术研究发展计划(863计划)资助项目(2007AA06Z128);中央高校基本科研业务费专项资金资助项目

摘　　要：与TiO2光催化剂相比,以SiO2为载体或内核制备的TiO2/SiO2复合催化剂,其表面活性、光催化活性和热稳定性都更高。以粉煤灰为原料制备的沉淀SiO2为硅源,钛酸四丁酯为钛源,采用化学包覆法制备TiO2/SiO2复合物,采用扫描电镜(XRD)、红外光谱(FT-IR)和差热分析(TG-DTA)等测试手段对该复合物进行表征。FT-IR和TG-DTA分析证实,SiO2被TiO2有效包覆。复合物热稳定性较高,经700℃焙烧4 h后,SiO2仍为无定形,TiO2以锐钛矿相为主;在900℃焙烧后,TiO2大部分由锐钛矿相转变为金红石相。As compared to TiO2 photo-catalyst,the surface activity,photocatalytic activity and thermal stability of TiO2/SiO2 composite catalyst,which prepared using SiO2 as carrier or nuclear,are better.The precipitated silica was obtained from fly ash.The titania/silica（TiO2/SiO2） composite was prepared by chemical coating method using precipitated silica and tetrabutyl titanate as precursors.The composite was characterized by means of X-ray difractometry,FT-IR spectroscopy and TG-DTA analysis.It is confirmed that the silica is efficiently coated by titania through FT-IR spectroscopy and TG-DTA analysis.The TiO2/SiO2 composite possesses high thermal stability.The phase of silica remains amorphous and titania is anatase after the composite calcined at 700 ℃ for 4 h.While,titania transforms into rutile when calcined at 900 ℃.

关 键 词：二氧化钛 沉淀二氧化硅 化学包覆 粉煤灰 

分 类 号：TQ171.4[化学工程—玻璃工业]