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Polymer-Titania Composites for Photocatalysis of Organics in Aqueous Environments

Published online by Cambridge University Press:  31 January 2011

Cecil A Coutinho  and
Vinay K Gupta
Cecil A Coutinho
Affiliation:
[email protected], University of South Florida, Chemical Engineering, Tampa, Florida, United States
Vinay K Gupta
Affiliation:
[email protected], University of South Florida, Chemical Engineering, Tampa, Florida, United States
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Abstract

Microcomposites composed of titanium dioxide nanoparticles embedded within cross-linked, thermally responsive microgels of poly(N-isopropylacrylamide) were prepared. These microcomposites showed rapid sedimentation, which is useful for gravity separation of the titania nanoparticles in applications such as environmental remediation. To investigate the degradation kinetics using these microcomposites in aqueous suspensions, methyl orange was employed as a model contaminant. The decline in the methyl orange concentration was monitored using UV-Vis spectroscopy. Degradation of methyl orange was also measured using only nanoparticles TiO2 (DegussaTM P25) for comparison with the microcomposites. Experiments were performed at different pH conditions that spanned acidic, neutral, and basic conditions to gain insight into the interplay of TiO2 surface charge, ionization of the polyelctrolyte chains in the microcomposites, and ionization of the methyl orange.

Keywords

compositeenvironmentally benigncatalytic
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1171: Symposium S – Materials in Photocatalysis and Photoelectrochemistry for Environmental Applications and H2 Generation , 2009 , 1171-S04-01-Q05-01
Copyright
Copyright © Materials Research Society 2009

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