UV协同Fenton试剂氧化法处理水中1,4对苯二酚及其动力学研究

[目的]研究UV/Fenton法降解水中1,4对苯二酚的最佳工艺条件及其动力学。[方法]采用UV/Fenton法处理1,4对苯二酚模拟废水,考察了nH2O2∶nFe2+、反应时间、H2O2用量、初始pH、紫外光强对1,4对苯二酚降解效果的影响,并初步探讨了1,4对苯二酚的降解动力学规律。[结果]UV/Fenton法降解1,4对苯二酚的最佳工艺条件:nH2O2∶nFe2+为5∶1,反应时间为60 min,H2O2投加量为3.5ml/L,初始pH为3,紫外光强度为500 W。在此条件下,浓度为1 000 mg/L的1,4对苯二酚的COD和浓度去除率分别可达93.19%和87.75%。UV辐射和Fenton氧化对1,4对苯二酚的降解具有协同效应。UV/Fenton法对1,4对苯二酚的降解符合准一级反应动力学方程,其表观速率常数为0.005 1 min-1。[结论]该研究为1,4对苯二酚污染治理提供了新途径。

Study on Treatment of 1,4-Dihydroxybenzene in Water by UV/Fenton Oxidation and Its Kinetics

[Objective] The research aimed to study the optimum technological conditions of 1,4-dihydroxybenzene degradation by UV/Fenton oxidation and its kinetics.[Method] UV/Fenton oxidation was used to treat the simulated wastewater of 1,4-dihydroxybenzene.The influences of nH2O2∶ nFe2+,reaction time,H2O2 dosage,initial pH and UV light intensity on degradation effect of 1,4-dihydroxybenzene were inspected.Moreover,the kinetics rule of 1,4-dihydroxybenzene degradation was discussed initially.[Result] The optimum technological conditions of 1,4-dihydroxybenzene degradation by UV/Fenton oxidation: nH2O2∶ nFe2+ was 5∶ 1,reaction time was 60 min,H2O2 dosage was 3.5 ml/L,initial pH was 3,and UV light intensity was 500 W.Under the condition,the removal ratios of 1 000 mg/L of 1,4-dihydroxybenzene COD and concentration respectively reached 93.19% and 87.75%.UV radiation and Fenton oxidation had synergistic effect on 1,4-dihydroxybenzene degradation.1,4-dihydroxybenzene degradation by UV/Fenton oxidation corresponded with pseudo-first-order reaction kinetics equation.The apparent speed constant was 0.005 1 min-1.[Conclusion] The research provided new channel for treatment of 1,4-dihydroxybenzene pollution.