Rapid Selective Circumneutral Degradation of Phenolic Pollutants Using Peroxymonosulfate-Iodide Metal-Free Oxidation: Role of Iodine Atoms.
Environ Sci Technol
; 51(4): 2312-2320, 2017 02 21.
Article
in En
| MEDLINE
| ID: mdl-28128552
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.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Iodides
/
Iodine
Language:
En
Journal:
Environ Sci Technol
Year:
2017
Type:
Article
Affiliation country:
Hong Kong