Experimental Study on Aqueous Oxidation of Sulfur Dioxide by Ozone under the Presence of Mn2

The aqueous removal of sulfur dioxide (SO 2 ) by oxidation of Mn 2+ catalytic ozone was investigated in the experiments, so as to find the effects of Mn 2+ for aqueous removal of SO 2 by ozone. The concentration curve of ozone was measured by standard iodine measurement method. The operating factors included mole ratio of ozone to SO 2 and the concentrations of Mn 2+ . When absorption solution has no Mn 2+ , the removal efficiency of SO 2 is 35% at 0.5 mole ratio of O 3 to SO 2 , but the efficiency is 70% when Mn 2+ is put into absorption solution at the same mole ratio of O 3 to SO 2 . As it is increasing, the removal efficiency of SO 2 increases. And as concentration of Mn 2+ increases, the efficiency also increases. At the end of the experimental studies, we made the conclusion that the optimal concentration range of Mn 2+ for the aqueous removal of SO 2 by Mn2+ catalytic ozone is 1.2A—10 -2 ~1.2A—10 -1 mol/L.