Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, People's Republic of China.
J Colloid Interface Sci. 2012 Nov 1;385(1):160-5. doi: 10.1016/j.jcis.2012.07.024. Epub 2012 Jul 16.
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.
镍/铁双金属纳米粒子被合成用于处理 Aroclor 1242，以评估其在原位修复受多氯联苯（PCBs）污染的地下水和土壤中的适用性。我们的实验结果表明，在 3,5-二氯联苯（PCB 14）还原过程中，总 PCB 浓度发生变化，最终产物为联苯。最初，在前期反应中 3-氯联苯（PCB 2）的浓度增加，然后缓慢降低，表明 Aroclor 1242 首先被 Ni/Fe 纳米粒子吸附，然后，较高氯代同系物逐渐转化为较低氯代同系物，最终转化为联苯。在 25°C 下仅需 5 小时，Aroclor 1242 的脱氯效率即可达到约 80%，在 10 小时和 24 小时时分别达到 95.6%和 95.8%。研究表明，高镍/铁纳米粒子用量和 Ni/Fe 纳米粒子中高镍含量有利于催化脱氯反应。此外，不同类型催化剂对 Aroclor 1242 脱氯反应的比较表明，Ni/Mg 和 Mg 粉末的反应活性大于 Ni/Fe 和 Fe 纳米粒子。
