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首页> 外文期刊>Frontiers of environmental science & eng >Dechlorination of 2,2',4,4',5,5'-hexachlorobiphenyl by thermal reaction with activated carbon-supported copper or zinc
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Dechlorination of 2,2',4,4',5,5'-hexachlorobiphenyl by thermal reaction with activated carbon-supported copper or zinc

机译：通过与活性炭负载的铜或锌进行热反应对2,2'，4,4'，5,5'-六氯联苯进行脱氯

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摘要

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 12.9mg·g~(-1) and 46.0mg·g~(-1) respectively. When applied to decompose 2,2',4,4',5,5'-hexachlorobiphenyl at 250 ℃, 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 ℃, all the four kinds of reactants can decompose PCB-153 with efficiency above 90%. Further, X-ray photoelec-tron spectroscopy characterization of IRCu-C before and after the reaction indicated transformation of 19.1% of Cu atoms into Cu~(2+), 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.
机译：由离子交换树脂（IRCu-C和IRZn-C）制成的负载有活性炭（AC）的铜或锌与增加的金属负载相比分别增加了557.3 mg·g〜（-1）和502.8 mg·g〜（-1）到传统方法所制得的方法，包括用AC和柠檬酸铜（Ⅱ）或柠檬酸锌溶液（LaCu-C和LaZn-C）浸渍12.9mg·g〜（-1）和46.0mg·g〜（-1）分别。当在250℃下分解2,2'，4,4'，5,5'-六氯联苯时，IRCu-C的分解效率比LaCu-C的84.7％，IRZn-C的90.5％和93.7％更高。 LaZn-C为62.7％。当反应温度升至350℃时，四种反应物都能以90％以上的效率分解PCB-153。此外，反应前后IRCu-C的X射线光电子能谱表征表明19.1％的Cu原子转化为Cu〜（2+），说明Cu是促进PCB分解的活性成分或电子供体-153。该过程的基础机制与传统的H供体不同。但是，反应前后IRZn-C的表面无明显变化，表明Zn在PCB-153分解过程中起催化剂的作用。

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