研究了CoTPPS4/Na2S2O8-H2O2体系(CoTPPS4:meso-四-(4-磺基苯基)卟啉钴)对农药敌敌畏(DDVP)催化氧化降解效果,探讨了氧化剂种类及比例、催化剂用量、农药初始浓度、pH值及反应温度等因素对催化降解速度的影响,并在优化条件下对降解反应的动力学进行了考察.结果表明,随着催化剂用量增加、初始农药浓度的降低、pH值升高(pH值为5～9)和温度的上升,DDVP降解率增加.室温时,在pH =9缓冲溶液中,农药初始浓度为1.015×10-4 mol/L、CoTPPS4加入量为2.4×10-3 g时,5 mL 0.050 mol/L Na2S2O8-H2O2(体积比4∶1)混合氧化剂存在条件下,7h后DDVP农药降解率可达72.8％,反应速率常数为0.190h-1.降解反应动力学研究表明,CoTPPS4催化混合氧化剂降解农药DDVP为表观一级反应,反应表观活化能Ea为5.052 kJ/mol.
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