Document Detail

Reductive defluorination of aqueous perfluorinated alkyl surfactants: effects of ionic headgroup and chain length.
MedLine Citation:
PMID:  19123849     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Perfluorinated chemicals (PFCs) are distributed throughout the environment. In the case of perfluorinated alkyl carboxylates and sulfonates, they can be classified as persistent organic pollutants since they are resistant to environmentally relevant reduction, oxidation, and hydrolytic processes. With this in mind, we report on the reductive defluorination of perfluorobutanoate, PFBA (C(3)F(7)CO(2)(-)), perfluorohexanoate, PFHA (C(5)F(11)CO(2)(-)), perfluorooctanoate, PFOA (C(7)F(15)CO(2)(-)), perfluorobutane sulfonate, PFBS (C(4)F(9)SO(3)(-)), perfluorohexane sulfonate, PFHS (C(6)F(13)SO(3)(-)), and perfluorooctane sulfonate, PFOS (C(8)F(17)SO(3)(-)) by aquated electrons, e(aq)(-), that are generated from the UV photolysis (lambda = 254 nm) of iodide. The ionic headgroup (-SO(3)(-) vs -CO(2)(-)) has a significant effect on the reduction kinetics and extent of defluorination (F index = -[F(-)](produced)/[PFC](degraded)). Perfluoroalkylsulfonate reduction kinetics and the F index increase linearly with increasing chain length. In contrast, perfluoroalkylcarboxylate chain length appears to have a negligible effect on the observed kinetics and the F index. H/F ratios in the gaseous fluoro-organic products are consistent with measured F indexes. Incomplete defluorination of the gaseous products suggests a reductive cleavage of the ionic headgroup occurs before complete defluorination. Detailed mechanisms involving initiation by aquated electrons are proposed.
Hyunwoong Park; Chad D Vecitis; Jie Cheng; Wonyong Choi; Brian T Mader; Michael R Hoffmann
Related Documents :
22208619 - Reactivity of aziridinomitosene derivatives related to fk317 in the presence of protic ...
23305149 - Metals in female scalp hair globally and its impact on perceived hair health.
19045309 - Some comments on the second virial coefficient of semiflexible polymers.
17274639 - Solubilization of paclitaxel (taxol) by peptoad self-assemblies.
11533039 - Reduction of interchain disulfide bonds precedes the dislocation of ig-mu chains from t...
19456129 - Structural basis for the sugar nucleotide and acyl-chain selectivity of leptospira inte...
20694249 - Self-assembled monolayers of perfluoroterphenyl-substituted alkanethiols: specific char...
16643029 - Dna methyl transferase inhibiting halogenated monoterpenes from the madagascar red mari...
25493619 - Isonitrile iron(ii) complexes with chiral n2p2 macrocycles in the enantioselective tran...
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The journal of physical chemistry. A     Volume:  113     ISSN:  1520-5215     ISO Abbreviation:  J Phys Chem A     Publication Date:  2009 Jan 
Date Detail:
Created Date:  2009-01-22     Completed Date:  2009-02-19     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9890903     Medline TA:  J Phys Chem A     Country:  United States    
Other Details:
Languages:  eng     Pagination:  690-6     Citation Subset:  -    
School of Physics and Energy Science, Kyungpook National University, Daegu 702-701, Korea.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

Previous Document:  CuX2-mediated halolactonization reaction of monoesters of 1,2-allenyl phosphonic acids and their Suz...
Next Document:  A coupled polarization-matrix inversion and iteration approach for accelerating the dipole convergen...