Photocatalytic degradation of gaseous toluene by using immobilized titania/silica on aluminum sheets

Tasbihi, Minoo and Kete, Marko and Raichur, Ashok M and Tusar, Natasa Novak and Stangar, Urska Lavrencic (2012) Photocatalytic degradation of gaseous toluene by using immobilized titania/silica on aluminum sheets. In: ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH, 19 (9). pp. 3735-3742.

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Abstract

The aim of this study was to prepare a highly active immobilized titania/silica photocatalyst and to test its performance in situ toward degradation of toluene as one of the major toxic indoor contaminants. In this work, two different titania layers immobilized on Al sheets were synthesized via low temperature sol-gel method employing presynthesized highly active titania powders (Degussa P25 and Millennium PC500, mass ratio 1:1): (a) with a silica/titania binder and a protective layer and (b) without the binder. The photocatalysts were characterized by X-ray diffraction, nitrogen sorption measurements, scanning electron microscopy (SEM), infrared spectroscopy, and UV-vis diffuse reflectance spectroscopy (DRS). The in situ photocatalytic degradation of gaseous toluene was selected as a probe reaction to test photocatalytic activity and to verify the potential application of these materials for air remediation. Results show that nontransparent highly photocatalytically active coatings based on the silica/titania binder and homogeneously dispersed TiO2 powders were obtained on the Al sheets. The crystalline structure of titania was not altered upon addition of the binder, which also prevented inhomogeneous agglomeration of particles on the photocatalyst surface. The photoactivity results indicate that the adsorption properties and photocatalytic activity of immobilized photocatalysts with the silica/titania binder and an underlying protective layer were very effective and additionally, they exhibited considerably improved adhesion and uniformity. We present a new highly photocatalytically active immobilized catalyst on a convenient metallic support, which has a potential application in an air cleaning device.

Item Type:	Journal Article
Publication:	ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
Publisher:	SPRINGER HEIDELBERG
Additional Information:	Copyright for this article belongs to Springer
Keywords:	In situ gaseous photocatalysis; TiO2 coatings; Al supports; Toluene; Photocatalytic degradation; Catalyst immobilization
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	31 Jan 2013 12:45
Last Modified:	01 Feb 2013 14:13
URI:	http://eprints.iisc.ac.in/id/eprint/45337

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