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Photooxidation of a model pollutant in an oscillatory flow reactor with baffles

Authors Gao, Ping View this author's profile
Ching, Wing Han
Hermann, Mark
Chan, Chi Kwong
Yue, Po Lock View this author's profile
Issue Date 2003
Source Chemical engineering science , v. 58, (3-6), February 2003, Pages 1013-1020
Summary The degradation of an organic model pollutant, salicylic acid, by means of heterogeneous photocatalytic oxidation in a pulsed baffled tubular photochemical reactor (PBTPR), has been studied. Our studies show that oscillatory flow in the PBTPR can efficiently produce uniform dispersion of catalysts of a wide range of catalyst particle sizes, ranging from 20-150 mum, and completely mineralize organic compounds. An interesting observation is that using the PBTPR with excess hydrogen peroxide, a nearly 100\% rutile titania (Aldrich) is more efficient in mineralizing organics than the anatase-rich Degussa P25. We attribute this to the enhanced mass transfer for the Aldrich catalyst due to chaotic mixing, which renders the hydrogen peroxide a more efficient electron acceptor and facilitates the rapid conversion of hydrogen peroxide to hydroxyl radicals. This simultaneously lowers the electron-hole recombination rate, which has been considered to be a major factor for the low oxidation efficiency of rutile titania catalysts. (C) 2003 Elsevier Science Ltd. All rights reserved.
ISSN 0009-2509
Language English
Format Article
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