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Title: Rapid selective circumneutral degradation of phenolic pollutants using peroxymonosulfate-iodide metal-free oxidation : role of iodine atoms
Authors: Feng, Y
Lee, PH 
Wu, DL
Shih, KM
Issue Date: 2017
Publisher: American Chemical Society
Source: Environmental science & technology, 2017, v. 51, no. 4, p. 2312-2320 How to cite?
Journal: Environmental science & technology 
Abstract: The development of environmentally friendly, oxidalion -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 mu M PMS and 50 mu M 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.
ISSN: 0013-936X
EISSN: 1520-5851
DOI: 10.1021/acs.est.6b04528
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