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Photocatalysis Using Semiconductor Nanoclusters

Published online by Cambridge University Press:  15 February 2011

J.P. Wilcoxon  and
T.R. Thurston
J.P. Wilcoxon
Affiliation:
Organization 1152, Sandia National Labs, Albuquerque, NM 87185-1421, jpwilco@sandia.gov
T.R. Thurston
Affiliation:
Organization 1152, Sandia National Labs, Albuquerque, NM 87185-1421, jpwilco@sandia.gov
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Abstract

We report on experiments using nanosize MoS2 to photo-oxidize organic pollutants in water using visible light as the energy source. We have demonstrated that we can vary the redox potentials and absorbance characteristics of these small semiconductors by adjusting their size, and our studies of the photooxidation of organic molecules have revealed that the rate of oxidation increases with increasing bandgap (i.e. more positive valence band and more negative conduction band potentials). Because these photocatalysis reactions can be performed with the nanoclusters fully dispersed and stable in solution, liquid chromatography can be used to determine both the intermediate reaction products and the state of the nanoclusters during the reaction. We have demonstrated that the MoS2 nanoclusters remain unchanged during the photooxidation process by this technique. We also report on studies of MoS2 nanoclusters deposited on TiO2 powder.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 549: Symposium FF – Advanced Catalytic Materials - 1998 , 1998 , 119
Copyright
Copyright © Materials Research Society 1999

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References

[1] Wilcoxon, J.P., Newcomer, P. and Samara, G.A., J. Appl. Phys., 81, 7934, (1997)Google Scholar
[2] Wilcoxon, J.P., Thurston, T.R., and Martin, J.E., Nanostructured Materials, (1998).Google Scholar
[3] Wilcoxon, J.P. and Craft, S.A., in Nano Structured Materials, Vol 9, pp. 85–88, 1997, Elesvier Science Ltd. Google Scholar
[4] Thurston, T.R. and Wilcoxon, J.P., J. Phys. Chem., accepted, 1998.Google Scholar
[5] Parsapour, F., Kelley, D.F., Craft, S., and Wilcoxon, J.P., J. Chem. Phys., 104, 1, (1996).Google Scholar
[6] Wilcoxon, J.P. and Samara, G.A., 51, 7299, Physical Rev B, Rapid Comm. (1995).Google Scholar