A novel process for decolorizing dyes with sulfate radicals (SO 4•−) using an Fe(II)/sulfite system is reported in this manuscript. The objective of this study was to investigate the conditions under which Fe(II) activates Na 2 SO 3 to produce SO 4•− and decolorize organic dyes. Orange II, Rhodamine B, Indigo Carmine, and Reactive Brilliant Blue X-BR could be efficiently decolorized using this novel system, which was compared with the Fe(II)/persulfate and Fenton (Fe(II)/H 2 O 2 ) systems. The Fe(II)/sulfite system surpassed the other two in the decolorization of these dyes, and detailed mechanisms of the Fe(II)/sulfite system were researched. Primary radical identification through quenching experiments using tert-butyl alcohol and ethanol confirmed the existence of SO 4 •− , HO • , and SO 5 •− . A kinetic model was established for the halide ion effect, and k I − ,SO 4 •− (3.2 × 10 11 mol −1 L s −1 ) and R SO 4 •− f (10 −4 −10 −3 mol L −1 s −1 ) were indirectly derived.In conclusion, the Fe(II)/sulfite system is a good candidate for use in detoxifying water contaminants.

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