Selective oxidation and direct decolorization of cationic dyes by persulfate without activation

Abstract

The aim of this work was to investigate the selective oxidation and direct decolorization of selected organic dyes (Methylene Blue (MB), Rhodamine B (RhB) and Orange II (OrgII)) by persulfate (PDS) without activation. Results show that the decolorization rate of MB was up to 58.0% within 10 minutes, while those of RhB and OrgII were only about 29.6% and 3.0% after 80 minutes, respectively. In comparison with the negligible impacts of pH from 2.0 to 9.0 on MB and OrgII decolorization, RhB decolorization rate obviously varied with the pH changes, and acid pH condition was beneficial for RhB decolorization. Quenching tests implied that the decolorization of dyes by PDS without activation was a nonradical oxidation process rather than sulfate radical oxidation. A plausible mechanism is that the decolorization process is attributed to the charged states of the dyes at different pH conditions, and thus direct electron transfer from dyes to PDS may occur, which is responsible for the bleaching of dyes. This study points out the potential bleaching capability of PDS without activation on cationic dyes, which may have important implications for selective oxidation treatment of dye wastewater. HIGHLIGHTS Persulfate selectively and effectively decolorized cationic dyes or dyes with positive charges under certain pH conditions.; Direct and non-radical oxidation process was proposed for decolorization of Methylene Blue and Rhodamine B by persulfate without activation.; Direct decolorization of dyes by persulfate without activation was not complete, and the degradation of dyes was limited.;

Keywords

• cationic dyes
• direct decolorization
• nonradical oxidation
• peroxydisulfate