化学包覆法制备TiO2／SiO2复合物.pdfVIP

学兔兔 第 15卷第5期 粉末冶金材料科学与工程 2010年1O月 VbI．15 N0．5 Materials Science and Engineering of Powder Metallurgy OCt．2010 化学包覆法制备TiO2／SiO2复合物 姚志通 一，夏枚生 ，叶 瑛 (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) 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SiO 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(XgD)、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，Ti02大部分由锐钛矿相转变为金红石相。 关键词：二氧化钛；沉淀二氧化硅；化学包覆；粉煤灰 中图分类号：TQ 171．4 文献标识码：A 文章编号：1673—0224(2010)5．474—05 Preparation of TiO2／SiO2 composite by chemical coating method — YAO Zhi．tong 一，XIA Mei．sheng ，YE Ying (1．Department ofOcean Science and Engineering，Zhejiang University，Hangzhou 3 10028，China； 2．Depa~ment of Environmental Science and Engineering，Tsinghua University，Beijing 1 00084，China) Abstract：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 confirm ed 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