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- Title
PHOTOCATALYTIC WATER PURIFICATION: SYNERGISTIC EFFECT WITH REACTIVE OXYGEN SPECIES (ROS).
- Authors
Tsuyoshi Ochiai; Akira Fujishima
- Abstract
Application of the strong oxidation ability of photo-excited TiO2 for water purification has received growing attention. Most of the aqueous contaminants such as haloalkanes, aliphatic alcohols, carboxylic acids, aromatics, polymers, surfactants, pesticides, and dyes, can be mineralized at the surface of UV-excited TiO2 photocatalysts. However, the quantum yields measured in photocatalytic water purification varied over the wide range of 0.1-10%, which was several times lower than those of photocatalytic air purification. The main problems are that UV penetration depth is strongly limited in colored wastewater and mass transfer rate coefficient in the wastewater is lower than it in air. One of the solutions of these problems is combination with other processes or technologies such as electrolysis, sonolysis, and advanced oxidation processes (AOPs). Especially the combination with AOPs is useful for decomposition of contaminants at relatively low cost. AOPs refer to a set of chemical treatment methods designed to remove organics in water by oxidation through reactions with reactive oxygen species (ROS) such as •OH. The combination of TiO2 photocatalysis with the other AOPs could enhance generation of ROS by synergistic effect. This chapter reviews these insights with several reports about photocatalytic water purification. Our recent studies are also mentioned.
- Subjects
PHOTOCATALYTIC oxidation; WATER purification; REACTIVE oxygen species; WATER pollution; ULTRAVIOLET radiation -- Environmental aspects; TITANIUM oxides
- Publication
Environmental Research Journal, 2013, Vol 7, Issue 4, p317
- ISSN
1935-3049
- Publication type
Article