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Surface Structures of 4-Chlorocatechol Adsorbed on Titanium Dioxide

Martin, Scot T. and Kesselman, Janet M. and Park, David S. and Lewis, Nathan S. and Hoffmann, Michael R. (1996) Surface Structures of 4-Chlorocatechol Adsorbed on Titanium Dioxide. Environmental Science and Technology, 30 (8). pp. 2535-2542. ISSN 0013-936X. http://resolver.caltech.edu/CaltechAUTHORS:20150810-152945299

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Abstract

TiO_2 has been extensively studied as a photocatalyst for the complete oxidation of a variety of organic pollutants commonly found in groundwater. In this paper, we investigate the surface structures formed between an organic substrate and TiO_2 in the context of understanding how these specific surface interactions affect photoreactivity. The surface complexes formed by 4-chlorocatechol (CT) sorbed on TiO_2 are investigated as a function of concentration and of pH. Singular-value decomposition of the IR spectra of CT adsorbed on TiO_2 indicates that a single bidentate chemisorbed species is present over the pH range of 2−10. The surface-bound species appears to have 40% covalent and 60% ionic bond character. The pH dependence of the adsorption isotherms is modeled using a generalized electric double-layer approach. The data are consistent with the formation of a bidentate binuclear surface group for solution CT concentrations below 50 μM followed by nonspecific multilayer partitioning at concentrations above 100 μM.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1021/es950872eDOIArticle
http://pubs.acs.org/doi/abs/10.1021/es950872ePublisherArticle
ORCID:
AuthorORCID
Lewis, Nathan S.0000-0001-5245-0538
Hoffmann, Michael R.0000-0002-0432-6564
Additional Information:© 1996 American Chemical Society. Received for review November 21, 1995. Revised manuscript received April 10, 1996. Accepted April 12, 1996. We are grateful to ARPA and ONR (NAV 5 HFMN N0001492J1901) for financial support.Drs. Ira Skurnick and Harold Guard provided generous support and encouragement. S.T.M. is supported by a National Defense Science and Engineering Graduate Fellowship. J.M.K. is the recipient of a National Science Foundation Predoctoral Fellowship. D.S.P. is a Summer Undergraduate Research Fellow. Wonyong Choi, Peter Green, and Nicole Peill provided critical analyses and stimulating discussion.
Funders:
Funding AgencyGrant Number
Advanced Research Projects Agency (ARPA)UNSPECIFIED
Office of Naval Research (ONR)NAV 5 HFMN N0001492J1901
National Defense Science and Engineering Graduate (NDSEG) FellowshipUNSPECIFIED
NSF Predoctoral FellowshipUNSPECIFIED
Caltech Summer Undergraduate Research Fellowship (SURF)UNSPECIFIED
Record Number:CaltechAUTHORS:20150810-152945299
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20150810-152945299
Official Citation:Surface Structures of 4-Chlorocatechol Adsorbed on Titanium Dioxide Scot T. Martin, Janet M. Kesselman, David S. Park, Nathan S. Lewis, and Michael R. Hoffmann Environmental Science & Technology 1996 30 (8), 2535-2542 DOI: 10.1021/es950872e
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:59365
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:11 Aug 2015 16:07
Last Modified:11 Aug 2015 16:07

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