Enhanced activation of persulfate by Fe(III) and catechin without light: Reaction kinetics, parameters and mechanism

Yuan Li; Yahong Shi; Dingfeng Huang; Yanlin Wu; Wenbo Dong

doi:10.1016/j.jhazmat.2021.125420

Enhanced activation of persulfate by Fe(III) and catechin without light: Reaction kinetics, parameters and mechanism

J Hazard Mater. 2021 Jul 5:413:125420. doi: 10.1016/j.jhazmat.2021.125420. Epub 2021 Feb 13.

Authors

Yuan Li¹, Yahong Shi¹, Dingfeng Huang¹, Yanlin Wu², Wenbo Dong³

Affiliations

¹ Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention, Department of Environmental Science & Engineering, Fudan University, Shanghai 200433, China.
² Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention, Department of Environmental Science & Engineering, Fudan University, Shanghai 200433, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China. Electronic address: wuyanlin@fudan.edu.cn.
³ Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention, Department of Environmental Science & Engineering, Fudan University, Shanghai 200433, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China. Electronic address: wbdong@fudan.edu.cn.

PMID: 33618272
DOI: 10.1016/j.jhazmat.2021.125420

Abstract

An environmental-friendly plant polyphenol, catechin (CAT), was applied in Fe(III) activated persulfate (PS) system for naproxen (NPX) degradation in this research. Reaction kinetics, parameters, NPX degradation products and reaction mechanism were investigated. Combining the results of quenching experiments as well as Electron Spin Resonance (ESR), it was observed that SO₄^•- was critical in NPX degradation, and the contribution of HO^• was minor in the Fe(III)/CAT/PS system. O₂^•- was generated during the reaction but did not contribute to NPX degradation. SO₄^•- and HO^• were produced from the PS activation by Fe(II), which was formed from the transient complexing and reduction process between Fe(III) and CAT. The effects of Fe(III), CAT, PS concentration and pH value on NPX degradation were evaluated. Moreover, the mineralization rate was 20.2%, and the toxicity of the treated solution were lower than the initial solution. Nine possible intermediates were determined when using LC-QTOF-MS to analyze, and three degradation pathways were put ward. The results proved that CAT could accelerate the redox cycle of Fe(III)/Fe(II), consequently to strengthen PS activation without light. It was a promising oxidation technology as it offered an energy-saving and hypo-toxic way for refractory organic pollutants treatment, and it was applicable at a comparatively wide pH range.

Keywords: Fe(III)/Fe(II) cycle; Persulfate; Polyphenol; Transient complexing; Without light.

Publication types

Research Support, Non-U.S. Gov't