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Photocatalytic inactivation of E-Coli by ZnO-Ag nanoparticles under solar radiation

Adhikari, Sangeeta and Banerjee, Aditi and Eswar, Neerugatti KrishnaRao and Sarkar, Debasish and Madras, Giridhar (2015) Photocatalytic inactivation of E-Coli by ZnO-Ag nanoparticles under solar radiation. In: RSC ADVANCES, 5 (63). pp. 51067-51077.

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Official URL: http://dx.doi.org/10.1039/c5ra06406f

Abstract

Porous and fluffy ZnO photocatalysts were successfully prepared via simple solution based combustion synthesis method. The photocatalytic inactivation of Escherichia coli bacteria was studied separately for both Ag substituted and impregnated ZnO under irradiation of natural solar light. A better understanding of substitution and impregnation of Ag was obtained by Raman spectrum and X-ray photoelectron analysis. The reaction parameters such as catalyst dose, initial bacterial concentration and effect of hydroxyl radicals via H2O2 addition were also studied for ZnO catalyst. Effective inactivation was observed with 0.25 g L-1 catalyst loading having 10(9) CFU mL(-1) bacterial concentration. With an increase in molarity of H2O2, photocatalytic inactivation was enhanced. The effects of different catalysts were studied, and highest bacterial killing was observed by Ag impregnated ZnO with 1 atom% Ag compared to Ag substituted ZnO. This enhanced activity can be attributed to effective charge separation that is supported by photoluminescence studies. The kinetics of reaction in the presence of different scavengers showed that reaction is significantly influenced by the presence of hole and hydroxyl radical scavenger with high efficiency.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the ROYAL SOC CHEMISTRY, THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND
Department/Centre: Division of Mechanical Sciences > Chemical Engineering
Depositing User: Id for Latest eprints
Date Deposited: 31 Jul 2015 10:05
Last Modified: 31 Jul 2015 10:05
URI: http://eprints.iisc.ac.in/id/eprint/51933

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