PMID- 19211124
OWN - NLM
STAT- MEDLINE
DCOM- 20090611
LR  - 20190420
IS  - 1879-1298 (Electronic)
IS  - 0045-6535 (Linking)
VI  - 75
IP  - 5
DP  - 2009 May
TI  - Destruction of pentachlorobiphenyl in soil by supercritical CO(2) extraction 
      coupled with polymer-stabilized palladium nanoparticles.
PG  - 629-633
LID - S0045-6535(09)00041-1 [pii]
LID - 10.1016/j.chemosphere.2009.01.018 [doi]
AB  - PCBs exhibit a wide range of toxic effects, and they are very stable compounds 
      and do not degrade readily. Although they had been banned in the 1970s; however; 
      it is still urgent to investigate and develop a financially viable, 
      environmentally benign and safe technology to treat the soils contaminated by 
      PCBs. This study investigated the feasibility of coupling of supercritical fluid 
      carbon dioxide (ScCO(2)) extraction with polymer-stabilized palladium 
      nanoparticles for the destruction of pentachlorinated biphenyl (2,2',4,5,5'-PCB) 
      from contaminated sand or soil samples. The extracted 2,2',4,5,5'-PCB can be 
      converted into non-chlorinated products by hydrodechlorination catalyzed by 
      palladium (Pd) nanoparticles, which were stabilized in high-density polyethylene 
      (HDPE) beads. Nearly all 2,2',4,5,5'-PCB was removed quantitatively from solid 
      matrices at 200atm and different temperatures. The final product was proved to be 
      biphenyl and cyclohexylbenzene. The polymer-stabilized palladium nanoparticle 
      catalyst, which does not contact the contaminated matrix directly, can be reused 
      without losing the high catalytic activity inherent by nanometer-sized particles. 
      Deactivation factors such as leaching of metal particles from support, 
      agglomeration and sintering are minimized in this catalyst system due to the 
      unique plastic matrix environment. A combination of supercritical fluid 
      extraction and an on-line catalytic reaction system utilizing the plastic 
      catalysts may have great advantages over other processes for destroying toxic 
      chlorinated compounds in environmental samples.
FAU - Wang, Joanna Shaofen
AU  - Wang JS
AD  - Department of Chemistry, University of Idaho, Moscow, ID 83844, USA.
FAU - Chiu, KongHwa
AU  - Chiu K
AD  - Department of Applied Science, National Dong Hwa University, Hualien 970, Taiwan, 
      ROC. Electronic address: ckh@mail.ndhu.edu.tw.
LA  - eng
PT  - Journal Article
DEP - 20090210
PL  - England
TA  - Chemosphere
JT  - Chemosphere
JID - 0320657
RN  - 0 (Polymers)
RN  - 0 (Soil Pollutants)
RN  - 142M471B3J (Carbon Dioxide)
RN  - 5TWQ1V240M (Palladium)
RN  - DFC2HB4I0K (Polychlorinated Biphenyls)
SB  - IM
MH  - Carbon Dioxide/chemistry
MH  - Catalysis
MH  - Chromatography, Supercritical Fluid/*methods
MH  - Environmental Restoration and Remediation
MH  - Metal Nanoparticles/*chemistry
MH  - Palladium/*chemistry
MH  - Polychlorinated Biphenyls/*analysis/isolation & purification
MH  - Polymers/chemistry
MH  - Soil Pollutants/*analysis/isolation & purification
EDAT- 2009/02/13 09:00
MHDA- 2009/06/12 09:00
CRDT- 2009/02/13 09:00
PHST- 2008/08/25 00:00 [received]
PHST- 2009/01/01 00:00 [revised]
PHST- 2009/01/07 00:00 [accepted]
PHST- 2009/02/13 09:00 [entrez]
PHST- 2009/02/13 09:00 [pubmed]
PHST- 2009/06/12 09:00 [medline]
AID - S0045-6535(09)00041-1 [pii]
AID - 10.1016/j.chemosphere.2009.01.018 [doi]
PST - ppublish
SO  - Chemosphere. 2009 May;75(5):629-633. doi: 10.1016/j.chemosphere.2009.01.018. Epub 
      2009 Feb 10.