Visible Light Photocatalysis with c-WO3鈥?i>x/WO3脳H2O Nanoheterostructures In Situ Formed in Mesoporous Polycarbosilane-Siloxane Polymer

详细信息    查看全文

• 作者：Mahdi Seifollahi Bazarjani ; Mirabbos Hojamberdiev ; Koji Morita ; Gangqiang Zhu ; Gennady Cherkashinin ; Claudia Fasel ; Thomas Herrmann ; Hergen Breitzke ; Aleksander Gurlo ; Ralf Riedel
• 刊名：The Journal of the American Chemical Society
• 出版年：2013
• 出版时间：March 20, 2013
• 年：2013
• 卷：135
• 期：11
• 页码：4467-4475
• 全文大小：616K
• 年卷期：v.135,no.11(March 20, 2013)
• ISSN：1520-5126

文摘

In recent years, there have been significant efforts to find novel photocatalytic materials with improved properties. Thus, there is an active ongoing search for new materials that can operate at a broad range of wavelengths for photocatalytic reactions. Among photocatalytically active semiconductors, considerable attention has been given to tungsten oxide with a band gap of E_g 鈮?2.6 eV, which provides the opportunity to harvest visible light. In the present work, we report on a one-step synthesis of c-WO_3鈥?i>x/WO₃脳H₂O nanowhiskers dispersed in a hydrolytically stable mesoporous polycarbosilane-siloxane ([鈭扴i(O)CH₂鈭抅_n) matrix. The as-synthesized nanocomposites possess high photocatalytic activity for the degradation of methylene blue (MB) under visible light irradiation. The enhanced photocatalytic activity is due to (i) the reduction in the electron鈥揾ole recombination rate because of the reduced dimensions of nanowhiskers, (ii) more efficient consumption of photogenerated electrons and holes as a result of the high surface-to-bulk-ratio of the nanowhiskers, and (iii) better electron鈥揾ole pair separation due to the formation of c-WO_3鈥?i>x/WO₃脳H₂O nanoheterostructures.