十二烷基苯磺酸钠对五氯酚钠光解体系的影响

Effect of SDBS on Photo-degradation of Sodium Pentachlorophenate

研究了不同浓度的阴离子表面活性剂十二烷基苯磺酸钠(SDBS)对五氯酚钠在水溶液中光解的影响。结果表明,表面活性剂不直接参与五氯酚钠的光反应;在(ρSDBS)小于其临界胶束浓度(CMC)时,SDBS对五氯酚钠的光反应有抑制作用,而ρ(SDBS)大于其CMC时,SDBS胶束的形成对五氯酚钠的光反应有加速的趋势。推测是由于ρ(SDBS)在达到CMC之前,对光解的影响以光吸收作用为主,对五氯酚钠光解有一定的抑制;而达到CMC后,胶束内部类似有机相的环境,对五氯酚钠有富集作用,从而加速五氯酚钠的光反应。

The effect of various concentration of surfactant and sodium dodecylbenzene sulfonate （SDBS） on the aqueous photodegradation of sodium pentachlomphenate were studied. The results showed that SDBS did not take part in the photodegmdation reaction. When the concentration of SDBS was below the critical micelle concentration （ CMC ）, the photodegradation was restrained , and when it yeas above the CMC, the photodegradation was accelerated. Based on surfactant property, it could be explained as follows： when the concentration of SDBS was below the CMC, SDBS absorbed some light energy and had some inhibiting effect on photodegradation of sodium pentachlorophenate; when it was above the CMC, SDBS had some enrichment effect on sodium pentachlorophenate, a circumstance like organic solution in micelle was formed, which was favorable to the photodegradation of sodium pentachlomphenate, and thus photolysis was activated in it.