Visible light photocatalytic inactivation of Escherichia coli with combustion synthesized TiO2

Sontakke, Sharad and Mohan, C and Modak, Jayant and Madras, Giridhar (2012) Visible light photocatalytic inactivation of Escherichia coli with combustion synthesized TiO2. In: CHEMICAL ENGINEERING JOURNAL, 189 . pp. 101-107.

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Abstract

The photocatalytic inactivation of Escherichia coil was studied with combustion synthesized TiO2 photocatalysts in the presence of visible light. A series of 400W lamps irradiating in the visible region of the solar spectrum was used. The effect of various parameters, such as catalyst loading, light intensity, presence of inorganic ions, addition of hydrogen peroxide and pH, on the photocatalytic inactivation of E. coil was investigated. Photolysis alone had a small effect on inactivation while the dark experiment resulted in no inactivation and Ag/TiO2 showed the maximum inactivation. At a catalyst loading of 0.25 g/L, all the combustion synthesized catalysts showed better inactivation of E. coil compared to commercial Degussa P-25 (DP-25) TiO2 catalyst. An improved inactivation was observed with increasing lamp intensity and addition of H2O2. A negative effect on inactivation was observed by addition of inorganic ions such as HCO3-, SO42-, Cl-, NO3-, Na+, K+ and Ca2+. The photocatalytic inactivation of E. coli remained unaltered at different pH of the solution. The inactivation of E. coli was modeled with power law kinetics and was observed to follow first order kinetics. (C) 2012 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Publication:	CHEMICAL ENGINEERING JOURNAL
Publisher:	ELSEVIER SCIENCE SA
Additional Information:	Copyright for this article belongs to Elsevier Science
Keywords:	Visible light; Combustion synthesis; Ag/TiO2; E. coli inactivation
Department/Centre:	Division of Mechanical Sciences > Chemical Engineering
Date Deposited:	10 Sep 2012 12:25
Last Modified:	10 Sep 2012 12:25
URI:	http://eprints.iisc.ac.in/id/eprint/45019

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