Defluorination of aqueous perfluorooctanesulfonate by activated persulfate oxidation

Activated persulfate oxidation technologies based on sulfate radicals were first evaluated for defluorination of aqueous perfluorooctanesulfonate (PFOS). The influences of catalytic method, time, pH and K2S2O8 amounts on PFOS defluorination were investigated. The intermediate products during PFOS de...

Full description

Saved in:
Bibliographic Details
Published in:PloS one 2013-10, Vol.8 (10), p.e74877-e74877
Main Authors: Yang, Shewei, Cheng, Jianhua, Sun, Jian, Hu, Yongyou, Liang, Xiaoyan
Format: Article
Language:English
Subjects:
Acids
Alkanesulfonic Acids - chemistry
Catalysis
Decomposition
Defluorination
Education
Environmental science
Fluorocarbons - chemistry
Food science
Halogenation
Heat
Hydrolysis
Intermediates
Iron
Laboratories
Oxidation
Oxidation-Reduction
Oxidation-reduction reactions
Perfluorooctane sulfonic acid
pH effects
Potassium persulfate
Radicals
Sulfate
Sulfates
Tandem Mass Spectrometry
Ultrasonic imaging
Ultrasound
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Activated persulfate oxidation technologies based on sulfate radicals were first evaluated for defluorination of aqueous perfluorooctanesulfonate (PFOS). The influences of catalytic method, time, pH and K2S2O8 amounts on PFOS defluorination were investigated. The intermediate products during PFOS defluorination were detected by using LC/MS/MS. The results showed that the S2O8 (2-) had weak effect on the defluorination of PFOS, while the PFOS was oxidatively defluorinated by sulfate radicals in water. The defluorination efficiency of PFOS under various treatment was followed the order: HT (hydrothermal)/K2S2O8 > UV (ultraviolet)/K2S2O8 > Fe(2+)/K2S2O8 > US (ultrasound)/K2S2O8. Low pH was favorable for the PFOS defluorination with sulfate radicals. Increase in the amount of S2O8 (2-) had positive effect on PFOS defluorination. However, further increase in amounts of S2O8 (2-) caused insignificant improvement in PFOS defluorination due to elimination of sulfate radicals under high concentration of S2O8 (2-). CF3(CF2)nCOOH (n = 0-6) were detected as intermediates during PFOS defluorination. Sulfate radicals oxidation and hydrolysis were the main mechanisms involved in defluorination process of PFOS.
ISSN:1932-6203
1932-6203
DOI:10.1371/journal.pone.0074877