PMID- 21049990
OWN - NLM
STAT- MEDLINE
DCOM- 20110217
LR  - 20141120
IS  - 1520-5851 (Electronic)
IS  - 0013-936X (Linking)
VI  - 44
IP  - 23
DP  - 2010 Dec 1
TI  - Degradation of pentachlorophenol and 2,4-dichlorophenol by sequential 
      visible-light driven photocatalysis and laccase catalysis.
PG  - 9117-22
LID - 10.1021/es1025432 [doi]
AB  - Chlorophenols (CPs) can be degraded by visible-light driven photocatalysis or 
      laccase catalysis. However, previous and present studies have shown that neither 
      of the two methods was efficient when being used individually. Low degradation 
      rates were observed for the degradation of pentachlorophenol (PCP) by 
      laccase-catalysis and that of 2,4-dichlorophenol (2,4-DCP) by photocatalysis. To 
      remove CPs more completely, a sequential photolaccase catalytic system was 
      designed to degrade PCP and 2,4-DCP mixture in water at the optimal pH value. The 
      results showed that photocatalysis prior to laccase-catalysis (PPL) is a better 
      approach than laccase-catalysis prior to photocatalysis (LPP), eliminating CPs 
      more efficiently and generating lower toxic products. The identified intermediate 
      products consisted of adipic acid, hexanediol, glycol, propylene glycol, 
      hydroquinol, and phthalandione. Based on the products identified, the sequential 
      degradation process was proposed, including the interlace reactions involving 
      quinoid oxidation, reductive dechlorination, and no-enzyme polymerization. Upon 
      reaction optimization, a piston flow reactor (PFR) was designed to treat the 
      continuous feeding of simulated wastewater containing PCP and 2,4-DCP. After a 
      128 h period of treatment, 87.4-99.5% total concentration of CPs were removed 
      (PPL removed 99.7% PCP and 99.2% 2,4-DCP; LPP removed 95.9% PCP and 78.9% 
      2,4-DCP).
FAU - Yin, Lifeng
AU  - Yin L
AD  - State Key Laboratory of Water Environment Simulation, School of Environment, 
      Beijing Normal University, Beijing 100875, PR China.
FAU - Shen, Zhenyao
AU  - Shen Z
FAU - Niu, Junfeng
AU  - Niu J
FAU - Chen, Jing
AU  - Chen J
FAU - Duan, Yanpei
AU  - Duan Y
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
DEP - 20101104
PL  - United States
TA  - Environ Sci Technol
JT  - Environmental science & technology
JID - 0213155
RN  - 0 (Chlorophenols)
RN  - 0 (Water Pollutants, Chemical)
RN  - D9BSU0SE4T (Pentachlorophenol)
RN  - EC 1.10.3.2 (Laccase)
RN  - R669TG1950 (2,4-dichlorophenol)
SB  - IM
MH  - Catalysis
MH  - Chlorophenols/*chemistry/toxicity
MH  - Environmental Restoration and Remediation
MH  - Escherichia coli/drug effects
MH  - Laccase/*chemistry
MH  - *Light
MH  - Oxidation-Reduction
MH  - Pentachlorophenol/*chemistry/toxicity
MH  - Photochemical Processes
MH  - Waste Disposal, Fluid/*methods
MH  - Water Pollutants, Chemical/*chemistry/toxicity
EDAT- 2010/11/06 06:00
MHDA- 2011/02/18 06:00
CRDT- 2010/11/06 06:00
PHST- 2010/11/06 06:00 [entrez]
PHST- 2010/11/06 06:00 [pubmed]
PHST- 2011/02/18 06:00 [medline]
AID - 10.1021/es1025432 [doi]
PST - ppublish
SO  - Environ Sci Technol. 2010 Dec 1;44(23):9117-22. doi: 10.1021/es1025432. Epub 2010 
      Nov 4.