Dechlorination of 2,2′,4,4′,5,5′-hexachlorobiphenyl by thermal reaction with activated carbon-supported copper or zinc

doi:10.1007/s11783-013-0543-y

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.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-013-0543-y
https://academic.hep.com.cn/fese/EN/Y2013/V7/I6/827

Fig.1 The efficiency of PCB-153 decomposition and biphenyl yield ratio at different temperatures. PDE: PCB-153 decomposition efficiency, BYR: biphenyl yield ratio

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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