Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/11710
Title: The mechanisms of rate enhancing and quenching of trichloroethene photodecay in the presence of sensitizer and hydrogen sources
Authors: Chu, W 
Choy, WK
Issue Date: 2002
Publisher: IWA Publishing
Source: Water research, 2002, v. 36, no. 10, p. 2525-2532 How to cite?
Journal: Water research 
Abstract: The reaction mechanisms and rates of trichloroethene (TCE) photodecay in the presence of photosensitizer (acetone, ACE) and hydrogen sources (surfactant and triethylamine, TEA) were investigated. Quantum yields of TCE photodecay in solution with surfactant Brij 35 and optimal ACE dosage are about 25 times higher than in Brij 35 alone. However, with an excess ACE dosage, ACE will act as a light barrier and attenuate the light intensity available for TCE photodegradation. TCE photodegradation follows a two-stage kinetics, in which a lag-phase is followed by a fast decay. The lag-phase distribution depends on initial pH levels and ACE concentrations. The overall TCE removal was found to be higher at high pH level, suggesting that free radical reaction is dominant at high pH levels. The use of additional hydrogen source (TEA) in the reaction can further accelerate the reaction, but overdosing of TEA would quench the reaction. The possible reaction mechanisms of TCE photodecay involving ACE and TEA were proposed, and rate-enhancing and rate-quenching models at low and high TEA concentrations respectively were derived based on the proposed mechanism; they were found useful for predicting the TEC decay quantum yields.
URI: http://hdl.handle.net/10397/11710
ISSN: 0043-1354
EISSN: 1879-2448
DOI: 10.1016/S0043-1354(01)00471-7
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