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

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

References

[1] Hosomi M. Chemical decomposition technologies for the treatment of polychlorinated biphenyls (PCBs). Journal of the Japan Society of Waste Management Experts, 2000, 11(3): 197-209 (in Japanese)

[2] Ukisu Y, Miyadera T. Dechlorination of dioxins with supported palladium catalysts in 2-propanol solution. Applied Catalysis A: General, 2004, 271(1-2): 165-170

[3] Zhang F, Chen J, Zhang H, Ni Y, Zhang Q, Liang X. Dechlorination of dioxins with Pd/C in ethanol-water solution under mild conditions. Separation and Purification Technology, 2008, 59(2): 164-168

[4] Cobo M, Conesa J A, Montes De Correa C. Effect of the reducing agent on the hydrodechlorination of dioxins over 2wt.% Pd/γ-Al₂O₃. Applied Catalysis B: Environmental, 2009, 92(3-4): 367-376

[5] Wang Z, Huang W, Peng P, Fennell D E. Rapid transformation of 1,2,3,4-TCDD by Pd/Fe catalysts. Chemosphere, 2010, 78(2): 147-151

[6] Kume A, Monguchi Y, Hattori K, Nagase H, Sajiki H. Pd/C-catalyzed practical degradation of PCBs at room temperature. Applied Catalysis B: Environmental, 2008, 81(3-4): 274-282

[7] Kainuma M, Takaoka M, Takeda N, Fujiwara T. Destruction of polychlorinated biphenyls by iron compounds. Proceedings of Environmental Engineering Research, 2000, 37: 477-485 (in Japanese)

[8] Chuang F W, Larson R A, Wessman M S. Zero-valent iron-promoted dechlorination of polychlorinated biphenyls. Environmental Science & Technology, 1995, 29(9): 2460-2463

[9] Cheng R, Wang J L, Zhang W X. Degradation of chlorinated phenols by nanoscale zero-valent iron. Frontiers of Environmental Science & Engineering in China, 2008, 2(1): 103-108

[10] Brinkman D W, Dickson J R, Wilkinson D. Full-scale hydrotreatment of polychlorinated biphenyls in the presence of used lubricating oils. Environmental Science & Technology, 1995, 29(1): 87-91

[11] Murena F, Schioppa E. Kinetic analysis of catalytic hydrodechlorination process of polychlorinated biphenyls (PCBs). Applied Catalysis B: Environmental, 2000, 27(4): 257-267

[12] Murena F, Schioppa E, Gioia F. Catalytic hydrodechlorination of a PCB dielectric oil. Environmental Science & Technology, 2000, 34(20): 4382-4385

[13] Hagenmaier H, Brunner H, Haag R, Kraft M. Copper-catalyzed dechlorination/hydrogenation of polychlorinated dibenzo-p-dioxins, polychlorinated dibenzofurans, and other chlorinated aromatic compounds. Environmental Science & Technology, 1987, 21(11): 1085-1088

[14] Bo L L, Liao J B, Zhang Y C, Wang X H, Yang Q. CuO/zeolite catalyzed oxidation of gaseous toluene under microwave heating. Frontiers of Environmental Science & Engineering, 2013, 7(3): 395-402

[15] Derbyshire F, Jagtoyen M, Andrews R, Rao A, Martin-Gullon I, Grulke E A. Carbon materials in environmental applications. In: Chemistry and physics carbon. 2nd ed. New York: Marcel Dekker, 2001, 1-66

[16] Nakagawa H, Watanabe K, Harada Y, Miura K. Control of micropore formation in the carbonized ion exchange resin by utilizing pillar effect. Carbon, 1999, 37(9): 1455-1461

[17] Sun Y, Takaoka M, Takeda N, Matsumoto T, Oshita K. Kinetics on the decomposition of polychlorinated biphenyls with activated carbon-supported iron. Chemosphere, 2006, 65(2): 183-189

[18] Zhu N, Li Y, Zhang F. Catalytic dechlorination of polychlorinated biphenyls in subcritical water by Ni/Fe nanoparticles. Chemical Engineering Journal, 2011, 171(3): 919-925

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Higher Education Press and Springer-Verlag Berlin Heidelberg