Abstract
In this study, pyrite/peroxymonosulfate (PMS)/hydroxylamine (HA) system could decolorize rhodamine B (RhB) in a wide pH range of 3.0-10.0. Near-100% decolorization of RhB was realized under optimum conditions of pyrite 0.4 g L−1, HA 0.8 mM, PMS 1.6 mM, and initial pH 4.0. Radical (mainly SO4•−) oxidation was the dominant process for RhB decolorization by pyrite/PMS/HA system, but nonradical (largely PMS) oxidation also played a non-negligible role. HA can act as a metal-free activator for PMS activation, and a reductant to boost Fe(III)/Fe(II) cycle in solution and on pyrite surface, which not only increased the production of radicals but also enhanced the stability of pyrite via inhibiting the S22− consumption. SO4•− that produced from pyrite oxidation was mainly from PMS activated by the Fe(II) in solution. Four other dye pollutants could also be decolorized completely. Our study suggests a promising process of pyrite/PMS/HA for organic dye pollutant treatment.
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