Catalytic dechlorination of Aroclor 1242 by Ni/Fe bimetallic nanoparticles.
Catalytic dechlorination of Aroclor 1242 by Ni/Fe bimetallic nanoparticles.
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DOI：
10.1016/j.jcis.2012.07.024
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发表时间：
2012-11
影响因子：
9.9
通讯作者：
Zhen Zhang;Sai Hu;S. A. Baig;Jie Tang;Xinhua Xu
中科院分区：
文献类型：
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作者：
Zhen Zhang;Sai Hu;S. A. Baig;Jie Tang;Xinhua Xu
合成Ni/Fe双金属纳米颗粒处理Aroclor 1242，评价其在多氯联苯（PCBs）污染地下水和土壤的原位修复中的适用性。我们的实验结果表明，在3,5-二氯联苯（PCB 14）的还原过程中，PCB的总浓度发生了变化，最终产物是联苯。反应前期3-氯联苯（PCB 2）浓度先升高后缓慢下降，表明Aroclor 1242首先被Ni/Fe纳米颗粒吸附，然后高氯化同系物逐渐转化为低氯化同系物，最后转化为联苯。在25℃条件下，Aroclor 1242的脱氯效率在5h内达到约80%，在10h和24h内分别达到95.6%和95.8%。研究表明，高Ni/Fe纳米颗粒用量和Ni/Fe纳米颗粒中高Ni含量有利于催化脱氯反应。此外，比较了不同类型催化剂对Aroclor 1242脱氯的影响，发现Ni/Mg和Mg粉末分别比Ni/Fe和Fe纳米颗粒表现出更强的反应活性。
Ni/Fe bimetallic nanoparticles were synthesized for treatment of Aroclor 1242, in order to evaluate their applicability for in situ remediation of groundwater and soil contaminated by polychlorinated biphenyls (PCBs). Our experimental results indicate that the total PCB concentration changed during the reduction of 3,5-dichlorobiphenyl (PCB 14), and biphenyl was produced as the final product. Initially, the concentration of 3-chlorobiphenyl (PCB 2) was increased in the prophase reaction and then slowly decreased, suggesting that Aroclor 1242 was first adsorbed by Ni/Fe nanoparticles, and then, the higher chlorinated congeners were converted gradually to the lower chlorinated congeners, and finally to biphenyl. The dechlorination efficiency of Aroclor 1242 reached approximately 80% at 25°C in just 5h, then 95.6% and 95.8% in 10h and 24h, respectively. The study revealed that high Ni/Fe nanoparticle dosage and high Ni content in Ni/Fe nanoparticles favor the catalytic dechlorination reaction. Moreover, a comparison of different types of catalysts on the dechlorination of Aroclor 1242 indicated that Ni/Mg and Mg powders showed a greater reactivity than Ni/Fe and Fe nanoparticles, respectively.