TiO₂/WO₃/Au nanoarchitectures鈥?photocatalytic activity 鈥渇rom degradation intermediates to catalysts鈥?structural peculiarities鈥?Part II: Aerogel based composites - fine details by spectroscopic means

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• 作者：L. Baia ; A. Vulpoi ; T. Radu ; 脡. Kar谩csonyi ; A. Dombi ; K. Hern谩di ; V. Danciu ; S. Simon ; K. Nor茅n ; S.E. Canton ; G. Kov谩cs ; Zs. Pap
• 关键词：TiO2 aerogel ; Tungsten (VI) oxide ; Gold nanoparticles ; Photodegradation intermediates ; Phenol
• 刊名：Applied Catalysis B: Environmental
• 出版年：27 April, 2014
• 年：2014
• 卷：148-149
• 期：Complete
• 页码：589-600
• 全文大小：2426 K

文摘

The 鈥渂uild-up鈥?methodology of a composite photocatalyst is a critical issue regarding the showed photocatalytic performance, including the formation of intermediates. To investigate this issue TiO₂/WO₃/Au aerogel composites were obtained by sol-gel method and subsequent photoreduction (Au) with UV or visible light. The obtained composites鈥?photocatalytic activity and intermediate formation profiles were evaluated using phenol as a model pollutant. XPS/UPS, XAFS and DRS were used to uncover local coordination, surface chemistry (of the different types of atoms (Ti, W, O and Au) and the band-structure (band-gap, possible electron transitions) of the obtained nanomaterials. The intermediates鈥?evolution profile and structural peculiarities were successfully correlated and it was shown that each minor structural (bulk or surface) change has a significant impact on the photocatalytic activity and intermediate formation dynamics.