To date, chlorine-based technologies have been widely used as disinfection processes to removal microbial contaminants from drinking water source. However, concerns about the formation of potentially mutagenic and carcinogenic disinfection by-products (DBPs) coming from the reaction with naturally occurring organic matter (NOM), the development of many alternative antimicrobial processes for disinfection of drinking water are currently necessary. Among the processes currently in the development, heterogeneous photocatalysis has emerged as attractive, environment-friendly alternative for the inactivation of pathogenic microorganisms in remote and rural areas where energy supply may be prohibitive and solar irradiation can be employed. Many research groups have reported the on the study on the effects of operational parameters such as incident light intensity, pH of solution, catalyst concentration, bacterial concentration, and the chemical composition of water. In spite of this wide range of studies, neither the photocatalytic inactive bacterial mechanism of TiO2 under visible radiations nor their kinetics of photocatalytic disinfection from a mechanistic point of the view has yet been well established. The main contribution of this study is to provide a better understanding of the bactericidal mechanism of TiO2 photocatalysis by identifying specific bacterial targets and chemical by-products, during the inactivation of bacteria in pure water. The photocatalytic inactivation of E. coli using as model based on a simplified reaction mechanism was investigated. We have studied the bacterial disinfection kinetics under various effects of catalyst dosage, bacterial concentration, and light intensity. Resultant experimental data will be evaluated using empirical bacterial inactivation models and Langmuir-Hinshelwood-like kinetic model.

Using visible-light-responsive TiO<sub>2</sub> catalyst for inactivation of the bacterial: Mechanism and kinetics

248th National Meeting (2014)

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Using visible-light-responsive TiO2 catalyst for inactivation of the bacterial: Mechanism and kinetics

Using visible-light-responsive TiO₂ catalyst for inactivation of the bacterial: Mechanism and kinetics