In this study

the oxidation rates of sulfur dioxide (SO

2

) in sulphuric acid solution by ozone and oxygen were compared

and the oxidation mechanism of ozone on SO

2

was investigated. The results showed that the oxidation-reduction potential of the acidic solution was enhanced

the transformation rate of sulfuric acid to sulphuric acid was increased and the absorption driving force was improved in the presence of ozone. By comparing the amount of sulfate ions measured in the experiments and the theoretical amount of sulfate ions calculated from the amount of ozone consumed in the reaction

it can be confirmed that oxygen free radicals from dissociation of ozone are reactive as an efficient oxidant and oxygen from ozone generator participates in the reaction with SO

2

. 0.602 mol of effective oxygen was introduced into the reaction by one mole of ozone in 10.15 min at sulphuric acid concentration of 3% (by mass)

SO

2

concentration of 1.33% (by volume) and oxygen flow rate of 1.5 L·min

-1

from ozone generator.