Photocatalytic Properties of Titania/Silica Composite Nanoparticles and Gels
Photocatalytic Properties of Titania/Silica Composite Nanoparticles and Gels
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DOI：
10.1002/9780470917145.ch15
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发表时间：
2010-09
期刊：
影响因子：
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通讯作者：
M. Hirano;K. Ota;Shunsuke Oya
中科院分区：
文献类型：
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作者：
M. Hirano;K. Ota;Shunsuke Oya
通过溶胶-凝胶法，使用偏硅酸钠（Na 2SiO 3）和具有金红石型、金红石型和板钛矿型结构的二氧化钛纳米管或二氧化钛纳米颗粒来合成由具有各种结构的二氧化硅和二氧化钛纳米颗粒组成的二氧化钛/二氧化硅复合凝胶。在碱性水热条件下，在NaOH存在下，生成了二氧化钛纳米管（TNT）和板钛矿型纳米颗粒。分别以酸性TiCl 4和TiOSO 4溶液为原料，采用水热法合成了金红石型和锐钛矿型二氧化钛纳米粒子。它们的光催化活性和吸附性能进行了评价，通过测量后，保持在黑暗中或在紫外光照射下的溶液中的亚甲基蓝（MB）的浓度。含有20 mol%锐钛矿型和板钛矿型二氧化钛的二氧化钛/二氧化硅复合凝胶显示出较好的光催化活性。
Titania/silica composite gels consisting of silica and titania nanoprticles with various structures were synthesized through a sol-gel process using sodium metasilicate (Na2Si03) and titania nanotubes or titania nanoparticles with anatase, rutile, and brookite-type structures. Titania nanotubes (TNT) and brookite-type nanoparticles were formed under basic hydrothermal conditions in the presence of NaOH. Rutile-and anatase-type titania nanoparticles were hydrothermally synthesized by the hydrolysis of acidic TiCl4 and TiOSO4 solutions, respectively. Their photocatalytic activity and adsorptivity were evaluated by measuring the methylene blue (MB) concentration remaining in the solution after being maintained in the dark or under UV-light irradiation. The titania/silica composite gels containing 20 mol% anatase-and brookite-type titania showed relatively good photocatalytic activity.