亚甲蓝分光光度法测定氧化降解瓦斯的羟基自由基

Spectrophotometric determination of hydroxyl radical of decomposing coal-mine gas by methylene blue decoloration

建立一种亚甲蓝作显色剂分光光度法测定Fenton试剂氧化降解瓦斯反应体系中·OH含量的方法,所产生的羟基自由基与亚甲蓝作用后使其吸光度降低,利用吸光度值的变化可间接测定·OH表观生成率,系统研究了H2O2浓度c(H2O2),Fe2+浓度c(Fe2+),初始pH值、反应温度等因素对·OH表观生成率的影响;同时,研究了异丙醇对·OH表观生成率和甲烷降解率的影响规律.结果不仅找出Fenton试剂氧化降解瓦斯反应体系中的·OH表观生成规律,而且为矿井瓦斯的绿色治理技术提供了重要的基础数据.

A method was developed for the determination of the hydroxyl radicals in the degradation of coal- mine gas with fenton reagent by spectrophotometry. Methylene Blue reacted with the produced hydroxyl radi- cals and the absorption decreased. With the change of absorption, it can be used to determine the apparent production efficiency of hydroxyl radical indirectly. The effects of H202 concentration, Fe2 ＋ concentration, in- itial pH value, and the reaction temperature on the apparent production efficiency of hydroxyl radical were in- vestigated, respectively. The influence of isopropanol on the apparent production efficiency of hydroxyl radical and the degradation efficiency of methane were also studied. The experimental results provide the important basic data for the green treatment technology of coal-mine gas disasters.