Interactions between chlorophenols and peroxymonosulfate : pH dependency and reaction pathways

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

14 Scopus Citations
View graph of relations

Author(s)

  • Yun-Jie Wang
  • Chang-Bin Chen
  • Jia-Yuan Lu
  • Hou-Qi Liu
  • Wen-Wei Li

Detail(s)

Original languageEnglish
Pages (from-to)133-139
Journal / PublicationScience of the Total Environment
Volume664
Online published4 Feb 2019
Publication statusPublished - 10 May 2019

Abstract

A non-radical reaction between peroxysulfates and phenolic compounds, as important structural moieties of natural organic matters, has been reported recently, implying new opportunities for environmental remediation without need for catalyst or energy input. However, this approach seems to be ineffective for halogenated aromatic compounds, an important disinfection by-products (DBPs). Here, we shed light on the interactions between peroxymonosulfate (PMS) and chlorophenols and the influential factors. The results show that the chlorophenols transformation kinetics were highly dependent on the solution pH and chlorophenol species: raising the pH significantly accelerated the chlorophenols degradation, and at alkaline pH the removal rates of different chlorophenols were in the order of trichlorophenol > dichlorophenol > chlorophenol > tetrachlorophenol. The faster degradation of pollutants with more chlorine groups was mainly due to their relatively higher dissociation degree, which favors a direct pollutant-PMS interaction to generate radicals for their degradation. The chlorophenol degradation intermediate (i.e. benzoquinone) further mediated the generation of singlet oxygen at alkaline pH, thereby contributing to accelerated pollutant removal. The slower degradation of tetrachlorophenol than other chlorophenols was likely due to its strong electrostatic epulsion to PMS which restricted the reaction. Our work unveils the chlorophenols degradation mechanisms in PMS reaction system, which may facilitate a better understanding and optimization of advanced oxidation processes for pollution control to reduce potential DBPs accumulation.

Research Area(s)

  • Chlorine group, Chlorophenols, Dissociation, Peroxymonosulfate (PMS), Singlet oxygen (1O2)

Citation Format(s)

Interactions between chlorophenols and peroxymonosulfate : pH dependency and reaction pathways. / Li, Chen-Xuan; Wang, Yun-Jie; Chen, Chang-Bin; Fu, Xian-Zhong; Cui, Shuo; Lu, Jia-Yuan; Liu, Hou-Qi; Li, Wen-Wei.

In: Science of the Total Environment, Vol. 664, 10.05.2019, p. 133-139.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review