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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Chen et al. (2012) studied this question.