Catalytic dechlorination of polychlorinated biphenyls in subcritical water by Ni/Fe nanoparticles
Catalytic dechlorination of polychlorinated biphenyls in subcritical water by Ni/Fe nanoparticles
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Ni/Fe纳米粒子催化亚临界水中多氯联苯脱氯
DOI：
10.1016/j.cej.2011.04.041
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发表时间：
2011-07
影响因子：
15.1
通讯作者：
Zhang, Fu-Shen
中科院分区：
文献类型：
--
作者：
Zhu, Neng-min;Yi-Li;Zhang, Fu-Shen
为了更好地了解亚临界水中纳米Ni/Fe颗粒对废电容器油中多氯联苯（PCBs）的脱氯反应性及相应的脱氯机理，进行了纳米Ni/Fe颗粒对PCBs脱氯反应的研究.批实验表明，纳米Ni/Fe颗粒比纳米零价铁（n-ZVI）和纳米Ni 0.在Ni/Fe颗粒存在下，脱氯产物更集中，主要产物为联苯、环己基苯和1-烷基苯，可作为化工原料。此外，通过引入Ni 0 as催化剂，催化加氢不仅可以导致快速脱氯，而且可以避免有毒的氯代烃的形成。纳米Ni/Fe在亚临界水中具有良好的催化活性，可用于快速加氢脱氯反应。该工艺为在处理含多氯联苯的电容器油或Transformer油过程中回收有价化学品提供了前景。
The present study was carried out to better understand the reactivity of nanoscale Ni/Fe particles towards the dechlorination of polychlorinated biphenyls (PCBs) contained in waste capacitor oil and the corresponding dechlorination mechanism in subcritical water. Batch experiments showed that nanoscale Ni/Fe particles could more quickly and effectively dechlorinate PCBs stepwise as compared to nanoscale zerovalent iron (n-ZVI) and nano-Ni0. The dechlorination products were much more centralized in the presence of Ni/Fe than other particles, and biphenyl, cyclohexyl-benzene and 1-alkyl-benzenes were the main products which can be used as raw chemicals. Moreover, catalytic hydrogenation by virtue of introduction of Ni0as catalyst can not only result in rapid dechlorination but also avoid formation of toxic chlorinated hydrocarbons. The reactivity of nanoscale Ni/Fe can retain in subcritical water for rapid catalytic hydrodechlorination. This process poses the prospect of recovery of valuable chemicals in the course of disposal of hazardous PCB-containing capacitor oil or transformer oil.
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