Fenton试剂氧化降解甲烷的动力学规律

Research on kinetic law of methane degradation with Fenton reagent

为研究Fenton试剂产生的羟基自由基·OH对甲烷的降解与动力学规律,利用自制的鼓泡反应装置,系统研究反应时间、H2O2浓度(c(H2O2))、Fe2+浓度(c(Fe2+))、初始pH值、反应温度等因素对煤矿瓦斯(甲烷)降解率的影响。实验结果表明,Fenton试剂对甲烷有较好的降解效果,对于浓度为4.9%的甲烷气体,当c(H2O2)=100 mmol/L、c(Fe2+)=2.0 mmol/L、初始pH=2.5、T=25℃时,反应30 min后,甲烷的最高降解率达0.25。通过对甲烷降解率与时间的变化关系进行非线性拟合,结果表明其反应动力学规律符合Boltzmann方程,而且方程中的参数d x即为影响Fenton试剂氧化降解甲烷效果的浓度经验校正系数,并最终得出甲烷降解率的定量计算公式。

In order to study methane degradation and the kinetic law with hydroxyl radicals （ · OH）generated via Fen- ton reagent,in the self-designed bubbling reactor, the effects of reaction time, H2 02 concentration, Fe2＋ concentration, initial pH value, and reaction temperature on coal-mine gas（methane） removal efficiency were investigated respective- ly. The experimental results indicate that Fenton reagent can effectively decompose methane. As for methane with an initial concentration of d. 9%, about 0. 25 of methane is degraded under the optimized experimental conditions of c（H202）= 100 mmol/L,c（Fe2＋） = 2. 0 mmol/L, initial pH value of 2. 5, and reaction temperature 25 after 30 min. Furthermore,the non-linear fitting of relationship curves between the degradation efficiency of methane and reaction time, demonstrates that the reaction kinetics accorded with Bohzmann equation. Meanwhile, the acts as the concentration e titative calculation-formula mp of irical correction-factor of influencing the degradation efficiency of methane methane degradation rate is finally obtained. parameter dx and the quan-