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Slurry photodegradation of 2,4-dichlorophenoxyacetic acid: A comparative study of impregnated and sol–gel In2O3–TiO2 mixed oxide catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
27785 44042 2008 5 PDF Available
Title
Slurry photodegradation of 2,4-dichlorophenoxyacetic acid: A comparative study of impregnated and sol–gel In2O3–TiO2 mixed oxide catalysts
Abstract

The synthesis, characterization and photocatalytic properties of impregnated In2O3/TiO2 and In2O3–TiO2 sol–gel catalysts were reported. A specific surface area was obtained on the In2O3–TiO2 catalysts prepared by the sol–gel method (153 m2/g) which was three times higher than that on the In2O3/TiO2 impregnated catalysts (58 m2/g). The XRD spectra of the samples showed the anatase phase as the only crystalline phase present in both catalysts. The determination of the Eg band gap by UV–vis spectroscopy showed a band gap of 3.5 eV for the In2O3–TiO2 photocatalysts while for the In2O3/TiO2 samples it was of 3.1 eV. The obtained photoactivity for the 2,4-dichlorophenoxyacetic acid degradation by the In2O3–TiO2 sol–gel catalysts (t1/2 = 35 min) was higher than the obtained by the In2O3/TiO2 impregnated catalysts (t1/2 = 88). The higher activity showed by the sol–gel photocatalysts can be related with specific surface area effects combined with those produced by the formation of highly dispersed In2O3 particles; and by the insertion of some In3+ cations in the titania framework.

Keywords
Indium oxide photocatalysts; 2,4-Dichlorophenoxyacetic acid degradation; Indium–titania mixed oxide XRD; Indium–titania mixed oxide; Sol–gel photocatalysts; Indium–titania mixed oxide Raman; Indium–titania mixed oxide UV–vis
First Page Preview
Slurry photodegradation of 2,4-dichlorophenoxyacetic acid: A comparative study of impregnated and sol–gel In2O3–TiO2 mixed oxide catalysts
Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 193, Issues 2–3, 25 January 2008, Pages 266–270
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering