Journal of Industrial and Engineering Chemistry, Vol.13, No.5, 827-834, September, 2007
Biological Toxicity Toward Zebrafish (Danio rerio) of Na- and K-TiO2 Photocatalytic Systems During the Decomposition of Bisphenol A
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In this study we examined the alkali metal-TiO2 photocatalytic decomposition of bisphenol A (BPA) and its biological toxicity to Zebrafish (Danio rerio). Alkali metal-TiO2 particles, which were prepared using a common sol-gel method, were used in an attempt to decompose BPA at a concentration of 10.0 ppm. The alkali metal-TiO2 particles having an anatase structure were ca. 50 100 nm in ∼ size and had surface areas of ca. 14∼24 m2/g. BPA, at a concentration of 10 ppm, was completely degraded by K-TiO2 photocatalysis after 50 h. However, 3.0 and 2.5 ppm BPA remained after 50 h when using pure TiO2 and Na-TiO2, respectively. A decrease in survival rate was observed for Zebrafish that had been reared in water containing 0.1 ppm BPA. Before photocatalysis, there were no toxic effects on the hatching rates or morphogenesis of the Zebrafish observed when using any of the photocatalyst powders, except for the pure TiO2 powders. Surprisingly, the pure TiO2 powder affected the Zebrafish: the hatching rates were remarkably lower than they were when using Na-TiO2 and K-TiO2 as the photocatalyst powders. During photocatalysis of 0.1 ppm BPA, serious toxic effects on the hatching rates or morphogenesis of Zebrafish were observed for each of the photocatalyst powders used. However, no toxicity was observed after BPA had been completely decomposed by the alkali metal-TiO2 photocatalysts.
Keywords:alkali metal-TiO2 powder;bisphenol A (BPA);photodecomposition;biological toxicity;zebrafish
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