Photodegradation of Polychlorobiphenyls by Titanium Dioxide/Ferric Ion/Hydrogen Peroxide/UV Light System

概要

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The photodegradation method of polychlorobiphenyls (PCBs) in the TiO_2/Fe^<3+>/H_2O_2/UV light system below 100℃ was studied, focusing on the conduction band electrons reduction pathway in concert with Fe^<3+> and H_2O_2 at a higher concentration. It was found that PCBs were degraded effectively by the use of the photocatalyst, TiO_2 particle, suspended in a solution of ferric chloride, hydrogen peroxide and alcohols under irradiation at 253.7 nm. The degradation rate of PCBs at a concentration of ca. 333 μg/ml by the system was significantly improved when a newly developed TiO_2 rutile, ST-R1,and amphipathic solvents such as tert-butanol-metanol (9 : 1) were used. The degradation rates of KC 400,KC 500 and KC 600 were 94.6%, 82.7% and 61.4%, respectively, as measured by their decreasing amount in the solutions by GC-MS. Furthermore, the system was able to degrade p, p'-DDT by 87.1% and aldrin by 97.9%, respectively, and volatile organic compounds, 1,1,2,2-tetrachloro-1,2-difluoroethane (CFC-112), tetrachloroethylene (PCE) and trichloroethylene (TCE) by 70-92% at room temperature.
公益社団法人日本薬学会の論文
1997-06-30