二酸化チタンを用いたコーティング法によるPolychlorinated Biphenyl(PCB)の半導体光触媒分解

概要

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Photocatalytic decomposition of polychlorinated biphenyl (PCB) with semiconductor, titanium dioxide (TiO_2), as a catalyst was investigated. TiO_2 aqueous suspension containing Kanechlor KC-300 (KC-300) as PCB (an aqueous suspension method) or TiO_2 powder coated with KC-300 (a coating method) was illuminated by a 1 kW xenon lamp. KC-300 (0.05 μg/ml) in the TiO_2 aqueous suspension (0.5 mg/ml) or 100 μg of KC-300 coated on 100 mg of TiO_2 powder were perfectly decomposed within 8 h and 4 h illumination, respectively. The decomposition rate of KC-300 in the coating method was higher than that in the suspension method. No decomposition was observed without illumination in the both methods. Hydroxyl radicals play a main role in the reaction of the suspension method. In the coating method, the presence of a small amount of water in TiO_2 powder promoted the decomposition rate. The results suggested that hydroxyl radicals are also reactive species in the coating method. All of 3 chlorine atoms in a KC-300 molecule were eliminated as chloride ions during the decomposition. The coating method is expected as a simple and effective method for the decomposition of PCB. Sunlight may be available for a light source.
公益社団法人日本薬学会の論文
1996-02-29