Preparation of Nanoporous TiO₂/SiO₂ Composite with Rice Husk as Template and Its Photocatalytic Property

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• 作者：Chen Hui ; Zhao Lei ; ^{materialzhaolei@hotmail.com" class="auth_mail" title="E-mail the corresponding author} ; Wang Xitang ; Li Shujing ; Lei Zhongxing
• 关键词：rice husk ; template ; TiO2/SiO2 nanoporous composite ; photodegradation property
• 刊名：Rare Metal Materials and Engineering
• 出版年：2015
• 出版时间：July 2015
• 年：2015
• 卷：44
• 期：7
• 页码：1607-1611
• 全文大小：1782 K

文摘

TiO₂/SiO₂ nanoporous composite with high anatase content, high specific surface area and good photocatalytic activity was prepared by sol-gel process using rice husk (RH) as template. The thermal behavior, the microstructure and the chemical composition of the composite were characterized by TG-DSC, XRD, FESEM, EDS and nitrogen physisorption. The results show that the transformation of TiO₂ from anatase to rutile begins at 700–800 °C and completes at about 1000 °C. When the TiO₂/SiO₂ nanoporous composite is annealed at 500 or 600 °C, nano-TiO₂ cells are arranged in linear ridges and furrows, and the catalytic activity points are formed. Along with the increase of treatment temperature, nano-TiO₂ cells form a layered structure on the surface and fill the pores of RH. TiO₂/SiO₂ nanoporous composite annealed at 500 °C exhibits the highest photodegradation efficiency of methyl blue, which is about 82% within 4 h.