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Simultaneous Cr(VI) Reduction and Naphthalene Oxidation in Aqueous Solutions by UV/TiO2

Published online by Cambridge University Press:  01 February 2011

Ricardo Guitierrez ,
Sergio o Flores ,
Omar Rios  and
Miguel Valenzuela
Ricardo Guitierrez
Affiliation:
[email protected], Instituto Politecnico Nacional, Lab. Catalisis y Materiales, IPN-ESIQIE, Edificio 8, tercer piso, Zacatenco, Mexico City, 07738, Mexico
Sergio o Flores
Affiliation:
[email protected], Instituto Politecnico Nacional, Lab. Catalisis y Materiales, IPN-ESIQIE, Edificio 8, tercer piso, Zacatenco, Mexico City, 07738, Mexico
Omar Rios
Affiliation:
[email protected], Instituto Politecnico Nacional, Lab. Catalisis y Materiales, IPN-ESIQIE, Edific io 8, tercer piso, Zacatenco, Mexico City, 07738, Mexico
Miguel Valenzuela
Affiliation:
[email protected], Instituto Politecnico Nacional, Lab. Catalisis y Materiales, IPN-ESIQIE, Edificio 8, tercer piso, Zacatenco, Mexico City, 07738, Mexico
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Abstract

The photocatalytic reduction of Cr (VI) and oxidation of naphthalene using UV light and TiO2 were investigated with variations in the pH and Cr (VI)/naphthalene ratio. The photochemical reduction of Cr (VI) single system was not observed, whereas the photochemical oxidation of naphthalene was significantly high. However, the reduction reaction rates of Cr (VI) and oxidation of naphthalene were improved in the system UV/TiO2. The removal of Cr (VI) decreased dramatically with increasing pH, in contrast, the naphthalene removal was not influenced by the pH. The presence of naphthalene functioned as a hole scavenger enhancing the photocatalytic reduction of Cr (VI) by the photogenerated electrons, while the removal of naphthalene was decreasing at increasing Cr (VI) content.

Keywords

catalyticorganicCr
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1045: Symposium V – Materials Science of Water Purification–2007 , 2007 , 1045-V03-05
Copyright
Copyright © Materials Research Society 2008

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