Fenton试剂降解农药废水中间羟基苯甲酸的动力学和热力学研究  

Kinetics and Thermodynamics of 3-hydroxybenzoic Acid in Pesticide Wastewater Degradation by Fenton Reagent

作　　者：杨智临 李亚龙[1] 杨琦[1] 吴桐[1] 

机构地区：[1]中国地质大学(北京)水资源与环境学院,北京100083

出　　处：《安徽农业科学》2014年第31期10944-10946,10978,共4页Journal of Anhui Agricultural Sciences

基　　金：中央高校基本科研业务费专项(265201301;2652013086;2652013087);北京市产学研项目(51900265005);国家科技重大专项(2009ZX07207-008;2009ZX07419-002;2009ZX07207-001);重点防控重金属汞;铬;铅;镉;砷便携/车载/在线监测仪器开发与应用示范(2012YQ060115)

摘　　要：[目的]探讨Fenton试剂作为氧化剂,对目标污染物——除草剂类农药废水中的间羟基苯甲酸的去除效果和动力学及热力学。[方法]考察了Fenton降解间羟基苯甲酸效果的影响因素;模拟了反应动力学和热力学;讨论了间羟基苯甲酸在氧化过程中降解和去除的规律和机理。[结果]在35℃、pH3.0、H2O2浓度为0.25 mol/L、H2O2/Fe2+=20的反应条件下,反应1 h后,Fenton对间羟基苯甲酸的去除率达到最高,为97.64%;Fenton对间羟基苯甲酸的降解过程符合一级动力学方程,速率常数(K)为0.252 1/min,半衰期(t1/2)为2.54 min;反应活化能(Ea)为12.72 kJ/mol。Fenton法对间羟基苯甲酸的氧化反应较完全,乙二酸和乙酸为主要的氧化反应终产物。[结论]为将来的实际工程应用提供了理论依据。[ Objective ] The aim was to explore kinetics and thermodynamics of 3-hydroxybenzoic acid in pesticide wastewater degradation by Fenton reagent. [ Method] Different influence factors in different operating conditions were discussed; the kinetics and thermodynamics was simulated; and law and mechanism of the degradation and removal of 3-hydroxybenzoic acid in the wastewater were also discussed. [ Result] Under the operating conditions of 35 ℃, pH value of 2.0, H2O2 concentration of 0.25 mol/L and H2O2/Fe2＋ = 20 after 1 h, the removal efficiency of 3-hydroxybenzoic acid reached 97.64%. The removal of 3-hydroxybenzoic acid by Fenton reagent fit the first order kinetics ; the reaction rate constant （K） was 0. 252 1 /rain; the half time （t1/2） was 2.54 min; and the activation energy of reaction （Eo） was 12.72 kJ/mol. The oxidation pathway of 3-hydroxybenzoic acid by Fenton reagent was complete, and oxalic acid and acetic acid were end products. [ Conclusion] The resuhs provide theoretical basis for practical engineer application in future.

关 键 词：FENTON 间羟基苯甲酸 氧化 动力学 热力学 

分 类 号：S181.3[农业科学—农业基础科学]