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Chemical and Physical Characterization of a TiO_2-Coated Fiber Optic Cable Reactor

Peill, Nicola J. and Hoffmann, Michael R. (1996) Chemical and Physical Characterization of a TiO_2-Coated Fiber Optic Cable Reactor. Environmental Science and Technology, 30 (9). pp. 2806-2812. ISSN 0013-936X. http://resolver.caltech.edu/CaltechAUTHORS:20150810-152944439

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Abstract

Practical application of metal oxide photocatalysts for the remediation of contaminated wastestreams often requires immobilization of the photocatalyst in a fixed-bed reactor configuration that allows the continuous use of the photocatalyst by eliminating the need for post-process filtration. A novel optical fiber cable reactor (OFR) is used to transmit UV light to solid-supported TiO_2 in order to investigate the photocatalytic degradation of pentachlorophenol (PCP), 4-chlorophenol (4-CP), dichloroacetate (DCA), and oxalate (OX). The distribution of light as a function of fiber diameter and the quantum efficiencies as a function of incident light intensity are investigated. Light propagation down individual fibers is found to increase with increasing fiber diameter. An increased linear transmission of light results in increased quantum efficiencies, while a 2-order of magnitude reduction in incident light intensity results in a 4-fold increase (φ = 0.010−0.042) in quantum efficiency for the degradation of 4-chlorophenol. The rates of degradation of dichloroacetate and oxalate have strong pH de pendencies. Relatively high apparent quantum efficien cies of φ = 0.010, 0.015, 0.08, and 0.17 for PCP, 4-CP, DCA, and OX, respectively, and complete mineralization to CO_2, H_2O, and HCl are observed in the OFR system.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1021/es960047dDOIArticle
http://pubs.acs.org/doi/abs/10.1021/es960047dPublisherArticle
ORCID:
AuthorORCID
Hoffmann, Michael R.0000-0002-0432-6564
Additional Information:© 1996 American Chemical Society. Received for review January 18, 1996. Revised manuscript received April 22, 1996. Accepted May 7, 1996. Publication Date (Web): August 27, 1996. We are grateful to ARPA and ONR (NAV 5 HFMN N000149J1901) for financial support and to Tim Wu, Janet Kesselman, Scot T.Martin, and Wonyong Choi for scientific support. We would also like to thank 3M and Degussa for their donations of the optical fiber samples and the P25 photocatalyst, respectively.
Funders:
Funding AgencyGrant Number
Advanced Research Projects Agency (ARPA)UNSPECIFIED
Office of Naval Research (ONR)NAV 5 HFMN N000149J1901
Record Number:CaltechAUTHORS:20150810-152944439
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20150810-152944439
Official Citation:Chemical and Physical Characterization of a TiO2-Coated Fiber Optic Cable Reactor Nicola J. Peill and Michael R. Hoffmann Environmental Science & Technology 1996 30 (9), 2806-2812 DOI: 10.1021/es960047d
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:59362
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:11 Aug 2015 17:54
Last Modified:11 Aug 2015 17:54

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