Abstract
Accelerated oxidation of emerging contaminants by permanganate (PM) in the presence of reducing reagents or ligands was reported in previous studies. Epigallocatechin gallate (EGCG) is a novel reagent used in water treatment, with simultaneous reducing and chelating ability. Therefore, EGCG was applied to enhance PM oxidation of bisphenol A (BPA) in this study, and showed a better performance than sulfite, hydroxylamine, EDTA, and citrate. The impacts of molar ratio of PM/EGCG, pH, dissolved oxygen, alkalinity, and natural organic matters on the performance of PM/EGCG process were investigated. The results demonstrated that optimum molar ratio of PM/EGCG was at 1:0.1, and EGCG significantly enhanced PM oxidation at pH 5–8. Dissolved oxygen and alkalinity showed inhibitory impacts on BPA degradation in PM/EGCG process, while natural organic matters have no obvious impact on the performance of PM/EGCG process. Formation of reactive Mn intermediates was confirmed using quenching experiments (with pyrophosphate) and UV–vis full scan spectra, indicating that reactive Mn intermediates were the predominant reactive species responsible for BPA degradation in PM/EGCG process. Overall, our study provides a novel and environmentally friendly alternative for enhancement of PM oxidation.
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