Kim Bo-Hye, Nataraj S K, Yang Kap Seung, Woo Hee-Gweon
Faculty of Applied Chemical Engineering and Alan G. MacDiarmid Energy Research Institute (AMERI), Chonnam National University, Gwangju 500-757, Korea.
J Nanosci Nanotechnol. 2010 May;10(5):3331-5. doi: 10.1166/jnn.2010.2289.
TiO2/SiO2 catalysts were loaded on carbon nanofibers (CNF) support by sol-gel preparation and followed by a dip-coating and heat treatment up to 900 degrees C in inert atmosphere. The photocatalytic activities of the catalysts (TiO2/SiO2)/CNF were tested by the photocatalytic degradation rate of methylene blue (MB) under UV irradiation. It was found that (TiO2/SiO2)/CNF showed a higher photocatalytic activity than TiO2/CNF only. It was analyzed that SiO2 contributed to an increase the photo catalytic activity by suppressing the phase transformation of the TiO2 crystals from anatase to rutile on the heat treatment up to 900 degrees C.
通过溶胶 - 凝胶法将TiO₂/SiO₂催化剂负载在碳纳米纤维（CNF）载体上，随后进行浸涂，并在惰性气氛中加热至900℃进行热处理。通过在紫外光照射下亚甲基蓝（MB）的光催化降解速率来测试催化剂（TiO₂/SiO₂）/CNF的光催化活性。结果发现，（TiO₂/SiO₂）/CNF表现出比仅TiO₂/CNF更高的光催化活性。分析认为，在高达900℃的热处理过程中，SiO₂通过抑制TiO₂晶体从锐钛矿相向金红石相的相变，有助于提高光催化活性。
