研究论文
孔令仁,陈曦,杨曦.附着态半导体光催化剂光解可溶性染料的研究[J].环境科学学报,1996,16(4):406-411
附着态半导体光催化剂光解可溶性染料的研究
- PHOTOLYSIS OF SELECTED SOLUBLE DYE USING ADHERENT SEMICONDUCTION CATALYST
- 基金项目：
- 作者
- 单位
- 孔令仁
- 南京大学环境科学与工程系,南京 210093
- 陈曦
- 南京大学环境科学与工程系,南京 210093
- 杨曦
- 南京大学环境科学与工程系,南京 210093
- 摘要：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:几种染料均显著光解;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)后其催化能力降低17.9%.以基态电荷转移复合物(下简称CTC)的形成和激发态电荷转移复合物(下简称CTC*)的解离,解释了充氧和碱性条件下光解加快现象,实验结果还表明光解速率常数k与染料初始浓度有关,这一现象通过推导得到证实。
- Abstract：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, TiO2-Fe2O3 or Ti2O-WO3,was found to be better than for adhered TiO2 along; and the catalytic effect of the TiO2 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.
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