摘要
研究了Fenton试剂氧化降解微污染水体中微囊藻毒素MC-LR的效果,在H2O2浓度1.5mmol·l-1,Fe2+浓度0.10mmol·l-1,反应温度为25±1℃,pH值为4.18及反应时间为30min的条件下,浓度为0.41mg·l-1的MC-LR去除率可以达到92.4%,降解过程符合准一级反应动力学.Fenton试剂氧化体系能有效地降解MC-LR,特别是在紫外光的照射下,MC-LR的降解速率得到大幅度提高.紫外光能促进Fe3+还原为Fe2+,所以光助Fenton试剂氧化反应中可以使用Fe3+代替Fe2+.
The effectiveness and feasibility of Fenton oxidation for the disinfection of microcystins-containing water were investigated. Under the optimal conditions of using 1.5 mmol·1^-1 H2O2,0. 1 mmol·1^-1 Fe^2＋, pH 4. 18, reaction temperature of 25 ±1℃ and reaction time of 30 minutes, respectively, up to 92. 4% MC-LR removal efficiency was attained when initial MC-LR concentration was 0. 41 mg·l^-1. The four different oxidation processes of Fe^2＋/H2O2, Fe^3＋/H2O2, UV/Fe^2＋/H2O2and UV/Fe^3＋/H2O2 were compared for the removal kinetics of MC-LR. It was found the degradation of MC-LR by these oxidation processes all followed a pseudo-first-order reaction behavior. The combined UV/Fe^2＋/H2O2system exhibited the best performance for promoting the oxidation rate attributed to the synergetic effect between UV and Fe^2＋ to decompose H2O2 to generate OH. The combined UV/Fe^3＋/H2O2system also showed high MC-LR removal efficiency due to the accelerated reduction from Fe^3＋ to Fe^2＋ under UV irradiation. The Fenton oxidation provides a feasible method for achieving significant microcystins degradation from the micropolluted water, especially in the presence of UV irradiation.
出处
《环境化学》
CAS
CSCD
北大核心
2007年第5期614-617,共4页
Environmental Chemistry
