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论文类型：期刊论文

发表时间：2011-03-01

发表刊物：APPLIED SURFACE SCIENCE

收录刊物：SCIE、EI

卷号：257

期号：10

页面范围：4709-4714

ISSN号：0169-4332

关键字：TiO2 microballs; Toluene; Photocatalytic oxidation; Surface photovoltage; In-situ FT-IR

摘要：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.