Photocatalytic activity of transparent porous glass supported TiO2
Photocatalytic activity of transparent porous glass supported TiO2
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DOI：
10.1016/j.ceramint.2009.05.029
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发表时间：
2009-12
影响因子：
5.2
通讯作者：
T. Yazawa;Fumiko Machida;Noriaki Kubo;T. Jin
中科院分区：
文献类型：
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作者：
T. Yazawa;Fumiko Machida;Noriaki Kubo;T. Jin
组成为96 SiO2·4 B2 O3（wt%）的多孔玻璃管负载TiO 2，由于其透明性和大的比表面积，显示出较高的光氧化活性。多孔玻璃管负载TiO 2的表面积比常规材料大10,000倍。负载型TiO 2晶体为锐钛矿型。多孔玻璃管的透明度非常重要。本文采用溶胶-凝胶法和化学气相沉积法（CVD）作为TiO 2负载工艺。CVD工艺更有效。例如，在10 W低压汞灯照射下，用CVD法制备的多孔玻璃管负载的TiO 2在300 s的接触时间内几乎完全分解了1 ppm的亚甲基蓝水溶液，而不透明的多孔氧化铝管负载的TiO 2仅分解了25%。多孔玻璃管的孔径越小，通过多孔玻璃管的透明度和渗透阻力越大。因此，多孔玻璃管与CA。从实际应用的观点来看，40 nm的孔径是合适的。
A porous glass tube with a composition of 96SiO2·4B2O3(wt%) supported TiO2shows high photooxidation activity due to its transparency and large surface area. The surface area of the porous glass tube supported TiO2is 10,000 times larger than that of conventional materials. TiO2crystals supported are anatase type. Transparency of the porous glass tube is very important. Herein, sol–gel and chemical vapor deposition (CVD) processes were employed as TiO2supporting processes. CVD process is more effective. For instance, an aqueous methylene blue solution with 1ppm concentration almost thoroughly decomposes at a contact time of 300s using porous glass tube supported TiO2prepared by CVD process under irradiating with 10W low-pressure mercury lamp, on the other hand, opaque porous alumina tube supported TiO2was only 25%. The smaller the pore size of the porous glass tube, the larger the transparency and the permeation resistance through porous glass tube. Hence, porous glass tube with ca. 40nm pore diameter is suitable from the standpoint of a practical use.