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论文类型：期刊论文

发表时间：2010-12-01

发表刊物：MATERIALS RESEARCH BULLETIN

收录刊物：SCIE、EI、Scopus

卷号：45

期号：12

页面范围：1889-1893

ISSN号：0025-5408

关键字：Oxides; Chemical synthesis; Catalytic properties; Optical properties

摘要：In this study, photocatalysts of TiO2 nanoballs were obtained via a hydrothermal treating of commercial P25 in alkaline solution, and then characterized with SEM, XRD, BET and surface photovoltage spectroscopy techniques. The UV-assisted photodegradation of gaseous benzene over P25 and the prepared TiO2 nanoballs was monitored by an in situ infrared technique. The results demonstrated that the prepared TiO2 nanoballs in anatase form were more active than commercial P25 in photocatalytic oxidation of gaseous benzene. 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. The spectra of FTIR indicated that weakly adsorbed phenol was formed as the reaction progress. Hydroxyl groups on the surface of TiO2 nanoballs are able to react with photo-produced phenol, which is then retained on the catalyst surface leading to the progressive deactivation of the catalyst in the gas-solid system. (C) 2010 Elsevier Ltd. All rights reserved.