Photocatalytic inactivation of Escherischia coli and Pichia pastoris with combustion synthesized titanium dioxide

Sontakke, Sharad and Modak, Jayant and Madras, Giridhar (2010) Photocatalytic inactivation of Escherischia coli and Pichia pastoris with combustion synthesized titanium dioxide. In: Chemical Engineering Journal, 165 (1). pp. 225-233.

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Abstract

The photocatalytic inactivation of Escherischia coli and Pichia Pastoris was studied with combustion synthesized titanium dioxide photocatalysts Three different combustion synthesized (CS) catalysts were used viz CS-TiO2 1% Ag substituted in TiO2 and 1% Ag impregnated in TiO2 All the combustion synthesized catalysts showed higher activity as compared to the activity observed with commercial Degussa P-25 TiO2 The effect of various parameters like catalyst loading different catalysts and initial cell concentration was studied At the optimum loading 1% Ag impregnated TiO2 showed the maximum efficiency and complete inactivation of both the microorganisms was observed within an hour of irradiation The morphology of inactivated cells was studied by inverted microscope and SEM From the images obtained it was hypothesized that damage to the cell wall was the main cause of cell inactivation The initial cell concentration had a prominent effect on the inactivation At a low initial cell concentration the complete inactivation of E cob and P pastoris was observed within 10 and 20 min respectively This shows that P pastoris has a stronger resistance towards photocatalytic inactivation than E cols The inactivation reactions were modeled with power law kinetics The order of reaction in case of E colt and P pastoris were determined as 1 20 and 1 08 respectively (C) 2010 Elsevier B V All rights reserved

Item Type:	Journal Article
Publication:	Chemical Engineering Journal
Publisher:	Elsevier Science
Additional Information:	Copyright of this article belongs to Elsevier Science .
Keywords:	Photocatalysis;Combustion synthesis;TiO2;Ag/TiO2;E coli; Pichia pastoris.
Department/Centre:	Division of Mechanical Sciences > Chemical Engineering
Date Deposited:	07 Feb 2011 12:26
Last Modified:	07 Feb 2011 12:26
URI:	http://eprints.iisc.ac.in/id/eprint/35019

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