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Photocatalytic properties of nano-structured TiO2-carbon films obtained by means of electrophoretic deposition by J.M. Peralta-Hernández; J. Manríquez; Y. Meas-Vong; Francisco J. Rodríguez; Thomas W. Chapman; Manuel I. Maldonado; Luis A. Godínez is a Environmental Science article available to read on EtoBox.

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Recent studies have shown that the light-absorption and photocatalytic efficiencies of TiO 2 can be improved by coupling TiO 2 nano-particles with nonmetallic dopants, such as carbon. In this paper, we describe the electrophoretic preparation of a novel TiO 2 -carbon nano-composite photocatalyst on a glass indium thin oxide (ITO) substrate. The objective is to take better advantage of the (e -/h + ) pair generated by photoexcitation of semiconducting TiO 2 particles. The transfer of electrons (e -) into adjacent carbon nano-particles promotes reduction of oxygen to produce hydrogen peroxide (H 2 O 2 ) which, in the presence of iron ions, can subsequently form hydroxyl radicals ( • OH) via the Fenton reaction. At the same time, • OH is formed from water by the (h + ) holes in the TiO 2 . Thus, the • OH oxidant is produced by two routes. The efficiency of this photolytic-Fenton process was tested with a model organic compound, Orange-II (OG-II) azo dye, which is employed in the textile industry.

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Author

J.M. Peralta-Hernández; J. Manríquez; Y. Meas-Vong; Francisco J. Rodríguez; Thomas W. Chapman; Manuel I. Maldonado; Luis A. Godínez

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0304-3894)

Published

2007

Language

EN

Field

Environmental Science (Physical Sciences)