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.
Highlights
Azo dye is the most widely used one of those synthesized organic dyes, whose market share is about 50% of the whole dye market
The results of photo-catalytic degradation of BTB showed that the decomposition rate increased with the TiO2 particle dosages and microwave intensity
The microwave/UV/TiO2/ozone hybrid process used in this study is an advanced oxidation processes (AOPs) that can overcome the limitations of the single-process ozone water treatment by using microwave and UV irradiations and resulting activation of photo-catalysts to maximize the formation of OH radicals
Summary
Azo dye is the most widely used one of those synthesized organic dyes, whose market share is about 50% of the whole dye market. The results of photo-catalytic degradation of BTB showed that the decomposition rate increased with the TiO2 particle dosages and microwave intensity. Researches have been conducted actively to improve oxidative degradation performance by adding microwave irradiation as an effort to utilize TiO2 photo-catalyst in water treatment more efficiently [5–10].
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