Journal
APPLIED SURFACE SCIENCE
Volume 257, Issue 10, Pages 4709-4714Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2010.12.133
Keywords
TiO2 microballs; Toluene; Photocatalytic oxidation; Surface photovoltage; In-situ FT-IR
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Funding
- National Nature Science Foundation of China [20837001, 20877013, NSFC-RGC 21061160495]
- National High Technology Research and Development Program of China [2007AA061402]
- Major State Basic Research Development Program of China [2007CB613306]
- Ph.D. Program Foundation of Ministry of Education of China [20070141060]
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In this study, photocatalysts of TiO2 microballls were obtained via a hydrothermal treating of commercial P25 in alkaline solution, and then characterized with SEM, XRD, BET, DRS and surface photovoltage spectroscopy (SPS) techniques. The photovoltage response of the prepared TiO2 microballs on spectrum features a quantum size effect brought about by the reduced grain size with respect to the precursor. The UV-assisted photodegradation of gaseous toluene over P25 and the prepared TiO2 microballs was monitored by an in situ infrared technique. The results demonstrated that the prepared TiO2 microballs in anatase form were more active than commercial P25 in photocatalytic oxidation of gaseous toluene. The promoted activity of the hydrothermal-treated TiO2 is attributed to the increasing specific surface area and larger band gap induced by the reduced crystallite size. (C) 2011 Elsevier B. V. All rights reserved.
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