十二烷基苯磺酸钠对异丙草胺光解体系的影响

The Effects of SDBS on Photodegradation of Propisochlor

    摘要
  • 摘要: 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)对除草剂异丙草胺在水溶液中光解的影响。结果表明,表面活性剂不直接参与异丙草胺的光反应;在ρ(SDBS)小于其临界胶束浓度(CMC)时,SDBS对异丙草胺的光反应有微弱抑制作用,而ρ(SDBS)大于其CMC时,SDBS胶束的形成对异丙草胺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,对异丙草胺光解有一定的抑制;而达到CMC后,胶束对异丙草胺有富集作用,胶束内部类似有机相的环境,利于异丙草胺光反应,此时SDBS对光解的作用就以加速光解为主。

     

    Abstract: The effects of photodegradation of propisochlor in several different concentrations of surfactant sodium dodecylbenzene sulfonate(SDBS) aqueous solution were studied.The results showed that SDBS did not act as participant in the photodegradation.When the concentration of SDBS was below the critical micelle concentration (CMC),the photodegradation was restrained,and when it was above the CMC,the photodegradation was accelerated.Based on surfactant properties,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 propisochlor;when it was above the CMC,SDBS had some enrichment effect on propisochlor,there formed a circumstance like organic solution in micelle,which is favorable to the photodegradation of propisochlor,and thus photolysis was activated in it.

     

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