Fenton试剂氧化降解甲烷的动力学规律 |
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引用本文: | 魏建平,戴俊,王政锦,王睿.Fenton试剂氧化降解甲烷的动力学规律[J].煤炭学报,2013,38(9):1597-1603. |
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作者姓名: | 魏建平 戴俊 王政锦 王睿 |
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作者单位: | 1.河南省瓦斯地质与瓦斯治理重点实验室--省部共建国家重点实验室培育基地,河南 焦作 454000;;
2.河南理工大学 安全科学与工程学院,河南 焦作 454000 |
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基金项目: | 国家自然科学基金资助项目(51074067);河南省基础与前沿研究资助项目(102300413220);河南省瓦斯地质与瓦斯治理重点实验室开放基金资助项目(WS2012A08) |
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摘 要: | 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。
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关 键 词: | 甲烷 Fenton试剂 羟基自由基 反应动力学 Boltzmann方程 |
收稿时间: | 2012-09-24 |
Research on kinetic law of methane degradation with Fenton reagent |
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Abstract: | 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. |
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Keywords: | methane Fenton reagent hydroxyl radical reaction kinetics Boltzmann equation |
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