PMID- 16245846
OWN - NLM
STAT- MEDLINE
DCOM- 20060608
LR  - 20190715
IS  - 0013-936X (Print)
IS  - 0013-936X (Linking)
VI  - 39
IP  - 19
DP  - 2005 Oct 1
TI  - Efficient photochemical decomposition of long-chain perfluorocarboxylic acids by 
      means of an aqueous/liquid CO2 biphasic system.
PG  - 7692-7
AB  - Photochemical decomposition of persistent and bioaccumulative long-chain (C9-C11) 
      perfluorocarboxylic acids (PFCAs) with persulfate ion (S2O8(2-)) in an 
      aqueous/liquid CO2 biphasic system was examined to develop a technique to 
      neutralize stationary sources of the long-chain PFCAs. The long-chain PFCAs, 
      namely, perfluorononanoic acid (PFNA), perfluorodecanoic acid (PFDA), and 
      perfluoroundecanoic acid (PFUA), which are used as emulsifying agents and as 
      surface treatment agents in industry, are relatively insoluble in water but are 
      soluble in liquid CO2; therefore, introduction of liquid CO2 to the aqueous 
      photoreaction system reduces the interference of colloidal PFCA particles. When 
      the biphasic system was used to decompose these PFCAs, the extent of reaction was 
      6.4-51 times as high as that achieved in the absence of CO2. In the biphasic 
      system, PFNA, PFDA, and PFUA (33.5-33.6 micromol) in 25.0 mL of water were 100%, 
      100%, and 77.1% decomposed, respectively, after 12 h of irradiation with a 200-W 
      xenon-mercury lamp; F- ions were produced as a major product, and short-chain 
      PFCAs, which are less bioaccumulative than the original PFCAs, were minor 
      products. All of the initial S2O8(2-) was transformed to SO42-. The system also 
      efficiently decomposed PFCAs at lower concentrations (e.g., 4.28-16.7 micromol of 
      PFDA in 25.0 mL) and was successfully applied to decompose PFNA in floor wax.
FAU - Hori, Hisao
AU  - Hori H
AD  - National Institute of Advanced Industrial Science and Technology (AIST), AIST 
      Tsukuba West, 16-1 Onogawa, Tsukuba 305-8569, Japan. h-hori@aist.go.jp
FAU - Yamamoto, Ari
AU  - Yamamoto A
FAU - Kutsuna, Shuzo
AU  - Kutsuna S
LA  - eng
PT  - Comparative Study
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
PL  - United States
TA  - Environ Sci Technol
JT  - Environmental science & technology
JID - 0213155
RN  - 0 (Carboxylic Acids)
RN  - 0 (Fluorocarbons)
RN  - 0 (Water Pollutants, Chemical)
RN  - 059QF0KO0R (Water)
RN  - 142M471B3J (Carbon Dioxide)
SB  - IM
MH  - Carbon Dioxide/*chemistry
MH  - Carboxylic Acids/analysis/*chemistry
MH  - Fluorocarbons/analysis/*chemistry
MH  - Kinetics
MH  - Phase Transition
MH  - Photochemistry/*methods
MH  - Water/chemistry
MH  - Water Pollutants, Chemical/*analysis
MH  - Water Purification/*methods
EDAT- 2005/10/26 09:00
MHDA- 2006/06/09 09:00
CRDT- 2005/10/26 09:00
PHST- 2005/10/26 09:00 [pubmed]
PHST- 2006/06/09 09:00 [medline]
PHST- 2005/10/26 09:00 [entrez]
AID - 10.1021/es050753r [doi]
PST - ppublish
SO  - Environ Sci Technol. 2005 Oct 1;39(19):7692-7. doi: 10.1021/es050753r.