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 1.2×10
^-2
~1.2×10
^-1
mol/L.