以稻壳为模板及硅原,采用溶胶凝胶法制备了具有高锐钛矿含量、高比表面积和较优光催化性能的TiO2/SiO2纳米孔复合材料.采用综合热分析仪(TG-DSC)、X射线衍射分析(XRD)、扫描电子显微镜、和N2吸/脱附手段对所制材料的热学性能、显微结构和化学组成经行了表征.结果表明,复合材料中锐钛矿型TiO2在700~800℃热处理后开始转变为金红石TiO2,1000℃转变完全.当处理温度在500~600℃时,纳米二氧化钛颗粒在稻壳引理生长,形成催化活性点.随着处理温度的升高,二氧化钛在稻壳孔隙结构表面形成层状结构.处理温度500℃时,TiO2/SiO2纳米孔复合材料具有最佳的催化性能,对甲基蓝的降解4h达82%.
参考文献
[1] | Ao CH;Lee SC .Indoor air purification by photocatalyst TiO2 immobilized on an activated carbon filter installed in an air cleaner[J].Chemical Engineering Science,2005(1):103-109. |
[2] | Chandrasekhar S;Pramada PN;Praveen L .Effect of organic acid treatment on the properties of rice husk silica[J].Journal of Materials Science,2005(24):6535-6544. |
[3] | Umeda, J.;Kondoh, K. .High-purification of amorphous silica originated from rice husks by combination of polysaccharide hydrolysis and metallic impurities removal.[J].Industrial Crops and Products,2010(3):539-544. |
[4] | Umeda, J.;Kondoh, K. .High-purification of amorphous silica originated from rice husks by combination of polysaccharide hydrolysis and metallic impurities removal.[J].Industrial Crops and Products,2010(3):539-544. |
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