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Indexed by:期刊论文

Date of Publication:2012-04-27

Journal:SEPARATION AND PURIFICATION TECHNOLOGY

Included Journals:SCIE、EI

Volume:90

Page Number:196-203

ISSN No.:1383-5866

Key Words:Water absorption; Photocatalysis; Scrubber system; TiO2; Odor control

Abstract:The water absorption and photocatalytic activity of TiO2 in a novel scrubber system for odor control using CH3SH gas as target compound was investigated. It was found that the amount of absorbed CH3SH in water increased with increasing initial pH of water, especially in basic water, which was approximately four times than those in acid and neutral water. Adding TiO2 into water had little influence on the dissolved property of CH3SH in water with different pH. TiO2 exhibited excellent photocatalytic activity in the scrubber system for CH3SH removal and reaction solution with high pH facilitated the photocatalytic degradation of CH3SH. In basic TiO2 suspensions, 96.3% of dissolved CH3SH was degraded and the pseudo-first-order kinetic constant was roughly 1.5 and 2.7 times of those obtained in neutral and acid TiO2 suspensions, respectively. Role of TiO2 on CH3SH degradation in water was also discussed. Furthermore, the outlet concentrations of CH3SH all decreased to nearly zero after 60 min of UV light irradiation in TiO2 suspensions with different pH. Varieties in the pH of water and TiO2 suspended solution after absorption and degradation process were measured. The absorption capacity of basic water with addition of TiO2 was relatively stable and TiO2 kept high photocatalytic activity for a long time (900 min). This study provided helpful information on expanding the photocatalytic scrubber system for practical odor treatment. (C) 2012 Elsevier B.V. All rights reserved.