Photocatalytic degradation of organic dyes in aqueous solution with TiO2 nanoparticles immobilized on foamed polyethylene sheet

Naskar, Subrata and Arumugom Pillay, S and Chanda, Manas (1998) Photocatalytic degradation of organic dyes in aqueous solution with TiO2 nanoparticles immobilized on foamed polyethylene sheet. In: Journal of Photochemistry and Photobiology A: Chemistry, 113 (03). pp. 257-264.

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Abstract

Degussa TiO2 nanoparticles have been immobilized on a foamed polyethylene by thermal bonding to produce a stable catalyst sheet containing 0.7 mg TiO2 cm(-2) and retaining 40-50% of active surface area of the particles. On such a catalyst sheet, exposed to radiation of a 125 W mercury vapour lamp, decomposition of about 0.3 mg of methylene blue (MB) is obtained per cm(2) in 1 h at ambient temperature from an aqueous solution of 200 ppm MB. The rate data fit well to classical Langmuir-Hinshelwood (L-H) rate form. This rate form also results from mechanisms based on the assumption of hydroxyl radical formation on the irradiated catalyst and a reaction between the hydroxyl radical and the organic dye molecule, either or none of them being adsorbed on the catalyst surface. An activation energy of 14.5 kcal mol(-1) is obtained for the photocatalytic decomposition of methylene blue following the L-H rate laws.

Item Type:	Journal Article
Publication:	Journal of Photochemistry and Photobiology A: Chemistry
Publisher:	Elsevier Science
Additional Information:	Copyright of this article belongs to Elsevier Science.
Keywords:	Photocatalytic degradation;Titania;Methylene blue; Polyethylene.
Department/Centre:	Division of Mechanical Sciences > Chemical Engineering
Date Deposited:	21 Dec 2009 12:01
Last Modified:	19 Sep 2010 05:26
URI:	http://eprints.iisc.ac.in/id/eprint/19045

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