几种表面活性剂和色素物质对氯苯嘧啶醇光化学降解的影响

以高压汞灯和太阳光为试验光源，研究了不同种类的表面活性剂和几种色素对氯苯嘧啶醇在固体表面和水中光解的影响。结果表明，高压汞灯下十二烷基苯磺酸钠（SDBS）和表面活性剂吐温-60（T-60）对氯苯嘧啶醇的表面光化学降解有很强的敏化作用，而十二烷基磺酸钠（sos）和十六烷基三甲基溴化铵（CrAB）对氯苯嘧啶醇的光解则具有一定的猝灭作用，且作用效应与剂量成正相关性；司班-20（Soan-20）对氯苯嘧啶醇的光解影响比较复杂，在剂量比为1：1时，表现为微弱的光敏作用，而当剂量比为5：1时则表现为较强的猝灭作用。太阳光下，表面活性剂十六烷基三甲基溴化铵（CTAB）对氯苯嘧啶醇水中光解有较强的敏化作用，而Span-20和SDS则表现出一定的猝灭作用；几种色素对氯苯嘧啶醇水中光解有一定的影响，低浓度时，亚甲基兰、核黄素对氯苯嘧啶醇光化学降解有一定的敏化作用，高浓度时反而表现出极强的猝灭作用；结晶紫对氯苯嘧啶醇的光解表现出一定的光猝灭作用效应，且与剂量成正相关。

Effects of Surfactants and Pigments on the Photodegradation of Fenarimol

Under high pressure mercury lamp(HPML)and sunlight,effects of different surfactants and pigments on photodegradation of fenarimol were investigated.The results indicated that fenarimol was strongly sensitized by T-60 and SDBS on glass surface,but SDS and CTAB quenched its photodegradation and the effect showed the direct proportion with the dosage ratio.The effect of S-20 was complicated,it sensitized the photodegradation of fenarimol slightly when the dosage was 1∶1,but quenched the photodegradation of fenarimol when the dosage was 5∶1.Under sunlight,cetyltrimethylammonium bromide(CTAB)showed photosensitizing effect on photodegradation of fenarimol in aqueous solution,but S-20 and SDS showed quenching effects in aqueous solution.Photosensitizers such as riboflavin,methylene-blue can accelerate the photodecomposition of fenarimol in low dosage ratio and quench its photodecomposition in large dosage ratio,but crystal-violet quenched its photodegradation in all dosage ratios and the quenching effect showed the direct proportion with the dosage ratio.