Decomposition of 2,2 ',4,4 ',5,5 '-hexachlorobiphenyl with iron supported on an activated carbon from an ion-exchange resin

作者：Sun Yifei^*; Takaoka Masaki; Takeda Nobuo; Wang Wei; Zeng Xiaolan; Zhu Tianle

来源：Chemosphere, 2012, 88(7): 895-902.

DOI：10.1016/j.chemosphere.2012.03.099

• Polychlorinated biphenyls
• Ion-exchange resin
• Activated carbon-supported iron
• Decomposition pathway
• Density functional theory

An activated carbon (AC) containing a high concentration (374 mg g(-1)) of Fe was prepared by carbonization of an ion-exchange resin. To examine its chemical reactivity as a catalyst to decompose 2,2',4,4',5,5'-hexachlorobiphenyl (PCB-153), the decomposition parameters of temperature and time were varied under air or N-2. Decomposition at 350 degrees C was achieved within 15 min under air and 30 min under N-2, and the efficiency of PCB-153 decomposition was 99.7% and 98.0%, respectively. An analysis of inorganic chloride ions revealed that PCB-153 was mineralized effectively during the decomposition. The Brunauer-Emmett-Teller (BET) surface area and pore volume of the AC were measured to assess the adsorption capacity before and after the decomposition. The differences between decomposition under air and N-2 reflected the differences in the BET surface and pore volume measurements. A decomposition pathway was postulated, and the reactive characteristics of chlorine atoms loaded on the benzene rings followed the order of para > meta > ortho, which agrees with the calculated results from a density functional theory study.

• 出版日期2012-8
• 单位北京航空航天大学; 清华大学