Kinetics and efficiency displayed by supported and suspended TiO2 catalysts applied to the disinfection of Escherichia coli

doi:10.1016/S1872-2067(14)60125-X

Abstract

Abstract:

TiO₂-mediated photocatalysis is widely used in a variety of applications and products in the environmental and energy fields, including photoelectrochemical conversion, self-cleaning surfaces, and especially water purification systems. The dimensionality of the structure of a TiO₂ material can affect its properties, functions, and more specifically, its photocatalytic performance. In this work, the photocatalytic inactivation of Gram-negative Escherichia coli using three photocatalysts, differing in their structure and other characteristics, was studied in a batch reactor under UVA light. The aim was to establish the disinfection efficiency of solid TiO₂ compared with that of suspended catalysts, widely considered as reference cases for photocatalytic water disinfection. The bacterial inactivation profiles obtained showed that: (1) the photoinactivation was exclusively related to the quantity of photons retained per unit of treated volume, irrespective of the characteristics of the photocatalyst and the emitted light flux densities; (2) across the whole UV light range studied, each of the photocatalytic solids was able to achieve more than 2 log bacterial inactivation with less than 2 h UV irradiation; (3) none of the used catalysts achieved a total bacterial disinfection during the treatment time. For each of the catalysts the quantum yield has been assessed in terms of disinfection efficiency, the 2D material showed almost the same performance as those of suspended catalysts. This catalyst is promising for supported photocatalysis applications.

Key words: Heterogeneous photocatalysis, Slurried catalyst, Supported catalyst, Disinfection kinetics, Quantum yield

Majdi Kacem, Gael Plantard, Nathalie Wery, Vincent Goetz. Kinetics and efficiency displayed by supported and suspended TiO₂ catalysts applied to the disinfection of Escherichia coli[J]. Chinese Journal of Catalysis, 2014, 35(9): 1571-1577.

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Kinetics and efficiency displayed by supported and suspended TiO₂ catalysts applied to the disinfection of Escherichia coli

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