Fenton试剂氧化降解甲烷的动力学规律

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)）、Fe 2+浓度（c(Fe 2+)）、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(Fe 2+)=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dx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。

Research on kinetic law of methane degradation with Fenton reagent

In order to study methane degradation and the kinetic law with hydroxyl radicals(·OH)generated via Fenton reagent，in the self-designed bubbling reactor，the effects of reaction time，H2O2 concentration，Fe 2+ concentration，initial pH value，and reaction temperature on coal-mine gas(methane)removal efficiency were investigated respectively.The experimental results indicate that Fenton reagent can effectively decompose methane.As for methane with an initial concentration of 4.9%，about 0.25 of methane is degraded under the optimized experimental conditions of c(H2O2)=100 mmol/L，c(Fe 2+)=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 Boltzmann equation.Meanwhile，the parameter dx acts as the concentration empirical correction-factor of influencing the degradation efficiency of methane and the quantitative calculation-formula of methane degradation rate is finally obtained.