附着态半导体光催化剂光解可溶性染料的研究

以３００Ｗ中压汞灯和日光为光源，研究了将ＴｉＯ２等半导体粉末附着在海砂和玻璃表面对直接耐晒大红４ＢＳ（下简称４ＢＳ）、活性黑ＫＮ－Ｂ（下简称ＫＮ－Ｂ）和亚甲基蓝（下简称ＭＢ）水溶液的催化光解。结果表明：几种染料均显光解；光解为一级动力学反应；附着复合的ＴｉＯ２－Ｆｅ２Ｏ３、ＴｉＯ２－ＷＯ３比附着单一的ＴｉＯ２光催化效果好；附着态ＴｉＯ２重复使用１５次（每次８ｈ）后催化能力降低１７．９％。以基态电

PHOTOLYSIS OF SELECTED SOLUBLE DYE USING ADHERENT SEMICONDUCTION CATALYST

Several semiconducting catalysts (such as titanium dioxide)adhered to the glass and sand were used for studying of the photolysis of soluble dye,4 BS(red), KN-B(black)and MB (blue) in aqueous solution under a 300 W middle pressure mercury lamp and the sunlight.It showed that all of the dye were remarkably photolyzed; the reactions were expressed as a first order kinetics;the catalytic effect for the adhered complex catalyst, TiO_2-Fe_2O_3 or Ti_2O-WO_3,was found to be better than for adhered TiO_2 along; and the catalytic effect of the TiO_2 adhered to the glass was only dropped 17. 9% after using 15 times(8 hrs each time).With the mechanism for forming the charge transfer complex(CTC) and the excited CTC to be decomposed, it explained that the photolysis rate can be accelerated when the dye solution was adjusted to basic condition(pH=11) or was bubbled with oxyge. The photolysis rate constant of 4 BS decreased with increasing concentration of the dye, which was also verified by the kinetic theory of adsorptio and reaction.