[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500W.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0.0051 min-1.[结论]该研究为1,4对苯二酚污染治理提供了新途径.%[Objective] The research aimed to study the optimum technological conditions of 1, 4-dihydroxybenzene degradation by UV/Fen-ton 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, H202 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, reaclion 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-firsl-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.
展开▼
