Preparation and characterization of silica-doped titania photocatalyst through sol-gel method
Preparation and characterization of silica-doped titania photocatalyst through sol-gel method
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DOI：
10.1016/s0167-577x(02)01409-x
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发表时间：
2003-06-01
影响因子：
3
通讯作者：
Gu, MY
中科院分区：
文献类型：
--
作者：
Cheng, P;Zheng, MP;Gu, MY
采用溶胶-凝胶法制备了掺杂二氧化硅的纳米二氧化钛粉体。研究了掺杂浓度对相变和晶粒生长的影响。随后，在一定掺杂浓度下对样品进行了研究，考察了煅烧温度对二氧化钛光活性的影响。结果表明，在800℃下煅烧的30SiO(2)/TiO2（30表示SiO2的重量百分比）比其他不同硅含量和不同煅烧温度的样品具有更高的光活性。二氧化硅的加入抑制了二氧化钛由锐钛矿向金红石的相变，并在二氧化钛中形成氧空位，从而提高了二氧化钛的光活性。(C) 2002 Elsevier Science B.V.版权所有
Silica-doped nanocrystalline titania powders were prepared using the sol-gel technique. The influence of dopant concentration on the phase transition and grain growth was studied. Subsequently the sample was studied at a constant dopant concentration to investigate the effect of calcination temperature on the pholoactivity of titania. It was found that 30SiO(2)/TiO2 (30 denotes the weight percent of SiO2) fired at 800 degreesC has a higher photoactivity than other samples with different silica content and different calcination temperature. The effect of addition of silica was to increase the photoactivity by suppressing the phase transformation of titania from anatase to rutile and forming oxygen vacancies in titania. (C) 2002 Elsevier Science B.V. All rights reserved.