用于大肠杆菌消毒的负载型和悬浮型TiO_2催化剂的动力学和催化效率（英文）  

Kinetics and efficiency displayed by supported and suspended TiO_2 catalysts applied to the disinfection of Escherichia coli

作　　者：Majdi Kacem Gael Plantard Nathalie Wery Vincent Goetz 

机构地区：[1]National Center for Scientific Research, UPR 8521, Laboratory of PROcess Materials and Solar Energy, Tecnosud, Rambla de la thermodynamique 66100 Perpignan, France [2]University of Perpignan Via Domitia, 52 Paul Alduy 66100 Perpignan, France [3]National Institute for Agricultural Research, UR0050, Laboratory of Environmental Biotechnology, Avenue des Etangs, 11100 Narbonne, France

出　　处：《催化学报》2014年第9期1571-1577,共7页

基　　金：supported by the "Community of Pyrenees Work" in 2012-2014 and the "future researcher" in 2013-2015

摘　　要：TiO2‐mediated photocatalysis is widely used in a variety of applications and products in the envi‐ronmental 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, differ‐ing 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 cata‐lysts, widely considered as reference cases for photocatalytic water disinfection. The bacterial inac‐tivation 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 disinfec‐tion efficiency, the 2D material showed almost the same performance as those of suspended cata‐lysts. This catalyst is promising for supported photocatalysis applications.TiO2-mediated photocatalysis is widely used in a variety of applications and products in the envi-ronmental 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, differ-ing 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 cata-lysts, widely considered as reference cases for photocatalytic water disinfection. The bacterial inac-tivation 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 disinfec-tion efficiency, the 2D material showed almost the same performance as those of suspended cata-lysts. This catalyst is promising for supported photocatalysis applications.

关 键 词：二氧化钛催化剂 大肠杆菌 杀菌效率 悬浮 动力学 光催化性能 显示 间歇式反应器 

分 类 号：O643.36[理学—物理化学] O614.411[理学—化学]