Mills, German and Hoffmann, Michael R. (1993) Photocatalytic Degradation of Pentachlorophenol on TiO_2 Particles: Identification of Intermediates and Mechanism of Reaction. Environmental Science and Technology, 27 (8). pp. 1681-1689. ISSN 0013-936X. https://resolver.caltech.edu/CaltechAUTHORS:20150811-111820190
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Abstract
The photoassisted oxidation of pentachlorophenol (PCP) in TiO_2 particle suspensions was investigated. Complete dechlorination of 47 µM PCP was achieved after 3 h of illumination at high intensity with apparent quantum efficiencies (ΦPCP, ΦCI, ΦH+, ΦH_2O_2) ranging from 1 to 3%. p-Chloranil, tetrachlorohydroquinone, H_2O_2, and o-chloranil were formed as the principal intermediates. Formate and acetate were formed as products during the latter stages of photooxidation. The mechanism for photooxidation of PCP proceeds via hydroxyl radical attack on the para position of the PCP ring to form a semiquinone radical which in turn disproportionates to yield p-chloranil and tetrachlorohydroquinone. Under high-intensity illumination, the reaction intermediates are attacked further by •OH to yield HCO_2^-, CH_3CO_2^-, CO_2, H^+, and Cl^-.
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| Alternate Title: | Photocatalytic degradation of pentachlorophenol on titanium dioxide particles: identification of intermediates and mechanism of reaction | |||||||||
| Additional Information: | © 1883 American Chemical Society. Received for review July 6, 1992. Revised manuscript received April 13, 1993. Accepted May 13,1993. Publication Date: August 1993. With are grateful to the U.S. Environmental Protection Agency (Grant R813326-01-0) for the financial resources to pursue this project and to the Degussa Corporation for a gift of the titanium dioxide. | |||||||||
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| Issue or Number: | 8 | |||||||||
| Record Number: | CaltechAUTHORS:20150811-111820190 | |||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20150811-111820190 | |||||||||
| Official Citation: | Photocatalytic degradation of pentachlorophenol on titanium dioxide particles: identification of intermediates and mechanism of reaction German Mills and Michael R. Hoffmann Environmental Science & Technology 1993 27 (8), 1681-1689 DOI: 10.1021/es00045a027 | |||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | |||||||||
| ID Code: | 59403 | |||||||||
| Collection: | CaltechAUTHORS | |||||||||
| Deposited By: | Ruth Sustaita | |||||||||
| Deposited On: | 11 Aug 2015 18:58 | |||||||||
| Last Modified: | 03 Mar 2020 13:01 |
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