ゾル‐ゲル法による二酸化チタン薄膜を用いた水中のトリクロロエチレンの光触媒分解

Abstract

Trichloroetylene in water was degraded photocatalytically by using thin-film TiO2. The photocatalyst of the thin-film TiO2 was prepared on the surface of quartz tubes by means of sol-gel process. The degradation reaction was studied by using the thin-film TiO2 prepared under the different condition of the calcination temperatures. The blacklight fluorescent lamp and the low pressure mercury lamp were used for the illumination. Under the illumination of the blacklight fluorescent lamp, the TiO2 of anatase accelerated the decomposition reaction rates about two times as fast as the TiO2 of rutile. Under the illumination of the low pressure mercury lamp, the decomposition reaction of trichloroetylene proceeded without the photocatalyst and the addition of the TiO2 of anatase accelerated the reaction a little further. No product of the degradation reaction was detected except CO2 and HCl. The life of the thin-film TiO2 photocatalyst was tested for six months intermittently and it was confirmed that the photocatalytic activity did not change during the experimental period.