Ultrasound-assisted heterogeneous activation of peroxymonosulphate by natural pyrite for 2,4-diclorophenol degradation in water: Synergistic effects, pathway and mechanism

Zeng Hui Diao, Zi Yu Lin, Xi Zhen Chen, Liu Yan, Fu Xin Dong, Wei Qian, Ling Jun Kong, Jian Jun Du, Wei Chu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

13 Citations (Scopus)

Abstract

In this paper, the natural pyrite was firstly used as peroxymonosulphate (PMS) activator in conjunction with ultrasonic irradiation (US) for 2,4-dichlorophenol (2,4-DCP) degradation in water. The most relevant findings indicated that a superior degradation of 2,4-DCP has been successfully achieved in pyrite/PMS/US system compared with pyrite/PMS and/or pyrite/US systems, which involved a synergistic effect between sonolysis and Fenton-like reaction. Within 120 min, nearly 98% of 2,4-DCP could be degraded at optimum reaction conditions of pyrite 1.00 g L−1, 2,4-DCP 10 mg L−1, PMS 2.00 mM and pH 4.02. A significantly enhanced PMS decomposition was probably ascribed to the sonochemistry (PMS/US and pyrite/US systems) and catalytic chemistry (pyrite/PMS system) under acidic conditions. Both SO4 [rad]− and HO[rad] took part in reaction process, while the SO4 [rad]− was dominant for 2,4-DCP degradation. A total of six intermediate products including 3,5-dichlorocatechol, 2-chlorophenol, 4-chlorocatechol, hydroquinone, maleic acid and oxalic acid were identified using GC/MS analyses to clarify the possible degradation pathways, which involved hydroxylation and substitution reactions. Compared to other Fenton reaction systems, both maximum degradation and mineralization levels of 2,4-DCP have been obtained from pyrite/PMS/US system. This study provides an interesting insight for PMS activation by the natural mineral-based catalyst with US irradiation for in situ organic pollutants remediation.

Original languageEnglish
Article number123771
JournalChemical Engineering Journal
Volume389
DOIs
Publication statusPublished - 1 Jun 2020

Keywords

  • 2,4-dichlorophenol
  • Fenton reaction
  • Peroxymonosulphate
  • Pyrite
  • Sulfate radicals
  • Ultrasound

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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