Abstract：A method was developed for the determination of the hydroxyl radicals in the degradation of coalmine gas with fenton reagent by spectrophotometry. Methylene Blue reacted with the produced hydroxyl radicals 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 H 2 O 2 concentration, Fe2 +concentration, initial pH value, and the reaction temperature on the apparent production efficiency of hydroxyl radical were investigated, 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.

Keyword：spectrophotometry;methylene blue;hydroxyl radical;coal-mine gas;