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Frontiers of Environmental Science & Engineering

Front Envir Sci Eng    2013, Vol. 7 Issue (6) : 827-832     https://doi.org/10.1007/s11783-013-0543-y
SHORT COMMUNICATION
Dechlorination of 2,2′,4,4′,5,5′-hexachlorobiphenyl by thermal reaction with activated carbon-supported copper or zinc
Yifei SUN1, Xin FU1, Wei QIAO2, Wei WANG3, Tianle ZHU1, Xinghua LI1()
1. School of Chemistry and Environment, Beihang University, Beijing 100191, China; 2. College of Chemical Science and Engineering, China University of Petroleum, Beijing 102249, China; 3. School of Environment, Tsinghua University, Beijing 100084, China
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Abstract

Activated carbon (AC)-supported copper or zinc made from ion exchange resin (IRCu-C and IRZn-C) have an increased metal load of 557.3 mg?g-1 and 502.8 mg?g-1 compared to those prepared by the traditional method involving impregnation with AC and copper (II) citrate or zinc citrate solution (LaCu-C and LaZn-C) of 12.9 mg?g-1 and 46.0 mg?g-1 respectively. When applied to decompose 2,2′,4,4′,5,5′-hexachlorobiphenyl at 250 °C, IRCu-C achieved higher activity of 99.0% decomposition efficiency than LaCu-C of 84.7%, IRZn-C of 90.5% and LaZn-C of 62.7%. When the reaction temperature rose to 350 °C, all the four kinds of reactants can decompose PCB-153 with efficiency above 90%. Further, X-ray photoelectron spectroscopy characterization of IRCu-C before and after the reaction indicated transformation of 19.1% of Cu atoms into Cu2+, illustrating that Cu is the active ingredient or electron donor promoting the decomposition of PCB-153. The mechanism underlying this process differs from a traditional H donor. However, there is no significant change on the surface of IRZn-C before and after the reaction, suggesting that Zn acts as catalyst during the process of PCB-153 decomposition.

Keywords polychlorinated biphenyls      activated carbon-supported copper or zinc      dechlorination      electron donor     
Corresponding Author(s): LI Xinghua,Email:lixinghua@buaa.edu.cn   
Issue Date: 01 December 2013
 Cite this article:   
Yifei SUN,Xin FU,Wei QIAO, et al. Dechlorination of 2,2′,4,4′,5,5′-hexachlorobiphenyl by thermal reaction with activated carbon-supported copper or zinc[J]. Front Envir Sci Eng, 2013, 7(6): 827-832.
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http://journal.hep.com.cn/fese/EN/10.1007/s11783-013-0543-y
http://journal.hep.com.cn/fese/EN/Y2013/V7/I6/827
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Yifei SUN
Xin FU
Wei QIAO
Wei WANG
Tianle ZHU
Xinghua LI
Fig.1  The efficiency of PCB-153 decomposition and biphenyl yield ratio at different temperatures. PDE: PCB-153 decomposition efficiency, BYR: biphenyl yield ratio
LaZn-CIRZn-C
250°C300 °C350 °C250 °C300 °C350 °C
Biphenyl0.1180.2080.2460.0760.0920.123
D20.3210.2620.2140.2980.1600.090
T3000000
T4000000
P50.2121.4732.1450.9291.1730.018
residual PCB-1533.7262.1880.5281.1480.5330.159
LaCu-CIRCu-C
250 °C300 °C350 °C250 °C300 °C350 °C
Biphenyl0.2591.0870.4350.3320.1610.202
D20.4110.3660.3340.4510.4210.248
T30.2380.3330.0350.0930.1310.155
T40.9420.3430.0050.0190.0270.031
P50.7810.0620.0050.0190.0180.006
residualPCB-1531.5320.0230.0020.1000.2770.006
Tab.1  Mass of PCB homological groups and biphenyl after reaction. (Unit: μg)
Fig.2  Proposed dechlorination pathway of PCB-153 by thermal reaction with AC-supported copper (a) and zinc (b)
Fig.3  (a) XPS Cu 2p spectra from IRCu-C before and after the reaction at 300 °C. (b) XPS Zn 2p spectra from IRZn-C before and after reaction at 300 °C
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