Highly Efficient Rhodamine B Decolorization by Pyrite/Peroxymonosulfate/Hydroxylamine System

• Published in: Water, air, and soil pollution Vol. 232; no. 4
• Main Authors: He, Guang-Jun, Zhong, Deng-Jie, Xu, Yun-Lan, Liu, Peng, Zeng, Si-Jing, Wang, Shuang
• Format: Journal Article
• Language: English
• Published: Cham Springer International Publishing 01.04.2021; Springer; Springer Nature B.V
• Subjects: Atmospheric Protection/Air Quality Control/Air Pollution; Climate Change/Climate Change Impacts; Decoloring; Decolorization; Dyes; Earth and Environmental Science; Environment; Environmental monitoring; Hydrogeology; Hydroxylamine; Hydroxylamines; Iron; Metals; Oxidation; pH effects; Pollutants; Pyrite; Reducing agents; Rhodamine; Soil Science & Conservation; Stability; Sulfur compounds; Sulphates; Water Quality/Water Pollution; ); Hydroxylamine; Peroxymonosulfate; Rhodamine B; Fe(III)/Fe(II) cycle; Pyrite (FeS
• ISSN: 0049-6979; 1573-2932
• DOI: 10.1007/s11270-021-05086-3

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 SO 4 •− ) 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 S 2 2− consumption. SO 4 •− 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.