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

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Department of Civil Engineering, The University of Hong Kong, Pokfulam, Hong Kong
Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Hong Kong
§ State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science & Engineering, Tongji University, Shanghai 200092, People’s Republic of China
*Phone: +852-2859-1973; fax: +852-2559-5337; e-mail: [email protected]
Cite this: Environ. Sci. Technol. 2017, 51, 4, 2312–2320
Publication Date (Web):January 27, 2017
https://doi.org/10.1021/acs.est.6b04528
Copyright © 2017 American Chemical Society
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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.

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The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acs.est.6b04528.

  • Details regarding the setting of background ionic strength, analysis of the selected pollutants, and identification of degradation intermediates and radicals (Text S1–S4); Tables S1–S5; Figures S1–S12 (PDF)

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