Rapid Selective Circumneutral Degradation of Phenolic Pollutants Using Peroxymonosulfate-Iodide Metal-Free Oxidation: Role of Iodine Atoms

Yong Feng, Po Heng Lee, Deli Wu, Kaimin Shih

Research output: Journal article publicationJournal articleAcademic researchpeer-review

48 Citations (Scopus)

Abstract

The development of environmentally friendly, oxidation-selective advanced oxidation processes (AOPs) for water decontamination is important for resource recovery, carbon dioxide abatement, and cost savings. In this study, we developed an innovative AOP using a combination of peroxymonosulfate (PMS) and iodide ions (I-) for the selective removal of phenolic pollutants from aqueous solutions. The results showed that nearly 100% degradation of phenol, bisphenol A, and hydroquinone was achieved after reaction for 4 min in the presence of 65 μM PMS and 50 μM I-. PMS-I-oxidation had a wide effective pH range, with the best performance achieved under circumneutral conditions. The ratio between [PMS] and [I-] influenced the degradation, and the optimal ratio was approximately 1.00 for the degradation of the phenols. Neither sulfate nor hydroxyl radicals were found to be the active species in PMS-I-oxidation. Instead, we found evidence that iodide atoms were the dominant oxidants. In addition, both Cl-and Br-also promoted the degradation of phenol in PMS solution. The results of this work may promote the application of reactive halogen species in water treatment.
Original languageEnglish
Pages (from-to)2312-2320
Number of pages9
JournalEnvironmental Science and Technology
Volume51
Issue number4
DOIs
Publication statusPublished - 21 Feb 2017

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry

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