PMID- 17977573
OWN - NLM
STAT- MEDLINE
DCOM- 20080612
LR  - 20161124
IS  - 0045-6535 (Print)
IS  - 0045-6535 (Linking)
VI  - 71
IP  - 2
DP  - 2008 Mar
TI  - Kinetics of reductive dechlorination of 1,2,3,4-TCDD in the presence of 
      zero-valent zinc.
PG  - 360-8
AB  - Polychlorinated dibenzo-p-dioxins (PCDDs) are toxic and widespread persistent 
      organic pollutants (POPs). Cost-effective technologies for destroying or 
      detoxifying PCDDs are in high demand. The overall purpose of this study was to 
      develop a zero-valent zinc based technology for transforming toxic PCDDs to less- 
      or non-toxic forms. We measured the dechlorination rates of 
      1,2,3,4-tetrachlorodibenzo-p-dioxin (1,2,3,4-TCDD) in the presence of zero-valent 
      zinc under aqueous conditions, identified the daughter compounds of the reaction, 
      and constructed possible pathways for the reactions. The reaction rates of 
      daughter compounds with zero-valent zinc were also measured independently. Our 
      results showed that the zero-valent zinc is a suitable candidate for reducing 
      PCDDs. Reductive dechlorination of 1,2,3,4-TCDD was stepwise and complete to 
      dibenzo-p-dioxin (DD) mainly via 1,2,4-trichlorodibenzo-p-dioxin (1,2,4-TrCDD), 
      1,3-dichlorodibenzo-p-dioxin (1,3-DCDD), 1-chlorodibenzo-p-dioxin (1-MCDD) to DD 
      and via 1,2,4-TrCDD, 2,3-dichlorodibenzo-p-dioxin (2,3-DCDD), 
      2-chlorodibenzo-p-dioxin (2-MCDD) to DD. In each separate system, the observed 
      half-lives of 1,2,3,4-TCDD, 1,2,3-TrCDD, 1,2,4-TrCDD, 1,2-DCDD, 1,3-DCDD, 
      1,4-DCDD and 2,3-DCDD are 0.56, 2.62, 5.71, 24.93, 41.53, 93.67 and 169.06 h 
      respectively. The tendency of rate constant follows TCDD>TrCDD>DCDD. Our results 
      suggest that zero-valent zinc is a suitable candidate for rapidly reducing highly 
      chlorinated PCDDs to less or non-chlorinated daughter products.
FAU - Wang, Zhiyuan
AU  - Wang Z
AD  - Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Wushan, 
      Guangzhou 510640, People's Republic of China.
FAU - Huang, Weilin
AU  - Huang W
FAU - Fennell, Donna E
AU  - Fennell DE
FAU - Peng, Ping'an
AU  - Peng P
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
PT  - Research Support, U.S. Gov't, Non-P.H.S.
DEP - 20071030
PL  - England
TA  - Chemosphere
JT  - Chemosphere
JID - 0320657
RN  - 0 (Polychlorinated Dibenzodioxins)
RN  - 059QF0KO0R (Water)
RN  - 4R7X1O2820 (Chlorine)
RN  - HF5S8P28CC (1,2,3,4-tetrachlorodibenzodioxin)
RN  - J41CSQ7QDS (Zinc)
SB  - IM
MH  - Chlorine/*chemistry
MH  - Environmental Pollution/*prevention & control
MH  - Kinetics
MH  - Models, Chemical
MH  - Polychlorinated Dibenzodioxins/*analogs & derivatives/chemistry
MH  - Water/chemistry
MH  - Zinc/*chemistry
EDAT- 2007/11/06 09:00
MHDA- 2008/06/13 09:00
CRDT- 2007/11/06 09:00
PHST- 2007/04/25 00:00 [received]
PHST- 2007/08/19 00:00 [revised]
PHST- 2007/08/22 00:00 [accepted]
PHST- 2007/11/06 09:00 [pubmed]
PHST- 2008/06/13 09:00 [medline]
PHST- 2007/11/06 09:00 [entrez]
AID - S0045-6535(07)01086-7 [pii]
AID - 10.1016/j.chemosphere.2007.08.049 [doi]
PST - ppublish
SO  - Chemosphere. 2008 Mar;71(2):360-8. doi: 10.1016/j.chemosphere.2007.08.049. Epub 
      2007 Oct 30.