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Photodegradation of dye pollutant under UV light by nano-catalyst doped titania thin films

Paper ID Volume ID Publish Year Pages File Format Full-Text
47915 46485 2008 8 PDF Available
Title
Photodegradation of dye pollutant under UV light by nano-catalyst doped titania thin films
Abstract

Undoped and manganese ion-doped TiO2 powders and thin films have been prepared by sol–gel route. The concentration of the manganese in TiO2 powders and films varied from 2 to 10 mol%. These powders were annealed at different temperatures from 300 to 1000 °C while films were annealed at 450 °C for 1 h. Prepared samples were characterized by XRD, SEM, XPS, spectroscopic and contact angle measurement techniques.Photocatalytic activity, in terms of rate constant measured by degradation of methylene blue dye, under UV exposure was found to increase from 0.27 to 0.36 for 5 mol% doping while very small photo activity has been observed under visible light exposure. Hydrophillicity also shows the same behavior. Optical studies revealed the generation of allowed energy band in the forbidden gap at ∼0.63 eV below the conduction band. It has been concluded that Mn doping increases photocatalytic activity by scavenging the photogenerated electrons, thereby increasing the life time of charge carriers and increasing the exposed surface area by reducing the crystallite size.

Keywords
Mn-doped TiO2 films; Sol–gel; Photodegradation; Methylene blue
First Page Preview
Photodegradation of dye pollutant under UV light by nano-catalyst doped titania thin films
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 84, Issues 1–2, 25 October 2008, Pages 233–240
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis