Roles of oxysulfur radicals in the oxidation of acid orange 7 in the Fe(III)-sulfite system

摘要

The Fe(III)-sulfite system has been regarded as a new alternative for the systems containing persulfate or peroxymonosulfate in the oxidation of organic contaminants in water or wastewater. Here, a detailed theoretical analysis was made on the inhibitory activities of the inhibitors (ethanol, tert-butyl alcohol, 1-hexanol, aniline, diphenylamine, and pyrogallol (PA)) to examine the roles of oxysulfur radicals in the oxidation of the azo dye acid orange 7 (AO7) in the Fe(III)-sulfite system. Experimental results confirm the expected concentration of inhibitors for the complete inhibition of specific radicals and establish that the combination of 1-hexanol and PA was suitable for analyzing the role of