期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 148, 期 -, 页码 589-600出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2013.12.034
关键词
TiO2 aerogel; Tungsten (VI) oxide; Gold nanoparticles; Photodegradation intermediates; Phenol
资金
- Swiss Contribution [SH/7/2/20]
- Romanian Hungarian [661/2013/K-TET_12_RO1-2013-0109966]
- MAX-Lab grant [20110343]
The build-up 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 sal-gel method and subsequent photoreduction (Au) with UV or visible light. The obtained composites' 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' 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. (c) 2013 Elsevier B.V. All rights reserved.
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