【摘要】 初步研究了Fenton试剂对久效磷的降解,分析了H2O2浓度、温度、反应时间、pH值和Fe2+浓度这5个因素对COD去除率的影响。实验结果表明,250 mL水样中3.75×10-4mol的久效磷在Fe2+浓度为0.5 mmol/L,pH=3,H2O2浓度为0.19 mol/L,T=70℃的条件下,Fenton试剂在1 h内COD去除率为60%,3 h内COD去除率为90%,8 h内COD去除率为100%。GC-MS测试结果表明,Fenton试剂对250 mL水样中3.75×10-4mol的久效磷5 min可降解81%,30 min降解100%。根据反应速率常数拟合得出该反应符合准一级反应,反应速率常数k=0.655 6 h-1。实验还发现了Cu2+对Fenton试剂有很强的协同催化作用,体系中Cu2+浓度为1.0×10-5mol/L时,Fenton试剂在5 h内对相同水样中COD去除率为101%。更多还原

【Abstract】 The decomposition of Monocrotophos by Fenton reagent was investigated.The influence of five factors(H₂O₂ concentration,temperature,reaction time,pH and Fe²⁺ concentration) on COD removal efficiency was analyzed.Under the condition of [Fe²⁺]=0.5 mmol/L,pH=3,[H₂O₂]=0.19 mol/L,T=70℃ and the amount of Monocrotophos was 3.75×10^-4 mol in 250 mL water samples,the removal efficiency of COD by Fenton reagent was 60% in 1 hour,90% in 3 hours and ca.100% in 8 hours.Analytical results of GCMS showed that 81% of 3.75×10^-4 mol Monocrotophos in 250 mL could be degradated by Fenton reagent in 5min,and 100% in 30min.Furthermore,Cu²⁺ could enhance the degradation ability of Fenton reagent on Monocrotophos.Under the condition of [Cu²⁺] =1.0×10^-5 mol/L,the removal efficiency of COD by Fenton reagent in 5 hours was 101%.更多还原