Open Access NANO EXPRESS

Assessment of Microwave/UV/O3 in the Photo-Catalytic Degradation of Bromothymol Blue in Aqueous Nano TiO2 Particles Dispersions

Sung Hoon Park1, Sun-Jae Kim2, Seong-Gyu Seo3 and Sang-Chul Jung1*

Author Affiliations

1 Department of Environmental Engineering, Sunchon National University, Jeonnam, 540-742, Korea

2 Department of Nano Science and Technology, Sejong University, Seoul, 143-747, Korea

3 Department of Civil & Environmental Engineering, Chonnam National University, Jeonnam, 550-749, Korea

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Nanoscale Research Letters 2010, 5:1627-1632  doi:10.1007/s11671-010-9686-y

Published: 18 July 2010

Abstract

In this study, a microwave/UV/TiO2/ozone/H2O2 hybrid process system, in which various techniques that have been used for water treatment are combined, is evaluated to develop an advanced technology to treat non-biodegradable water pollutants efficiently. In particular, the objective of this study is to develop a novel advanced oxidation process that overcomes the limitations of existing single-process water treatment methods by adding microwave irradiation to maximize the formation of active intermediate products, e.g., OH radicals, with the aid of UV irradiation by microwave discharge electrodeless lamp, photo-catalysts, and auxiliary oxidants. The results of photo-catalytic degradation of BTB showed that the decomposition rate increased with the TiO2 particle dosages and microwave intensity. When an auxiliary oxidant such as ozone or hydrogen peroxide was added to the microwave-assisted photo-catalysis, however, a synergy effect that enhanced the reaction rate considerably was observed.

Keywords:
Photo-catalysts; Microwave; UV; Ozone; Dye