CAJ | 학술논문

采用浸渍法制备了碳纳米管负载镍镧(Ni-La)/镍钴(Ni-Co)双金属复合材料Ni-La/CNTs和Ni-Co/CNTs，采用投射电子显微镜(TEM)和X射线粉末衍射仪(XRD)对样品的结构特征和组成进行了表征。并通过吸附实验探讨了Ni-La/CNTs和Ni-Co/CNTs对水中2,2′,4,4′-四溴联苯醚(BDE-47)的去除性能和去除机制。结果表明：Ni-La/CNTs和Ni-Co/CNTs表面负载了Ni-La或Ni-Co双金属粒子，主要是金属氧化物，并没有检测到明显的金属单质信号。Ni-La/CNTs和Ni-Co/CNTs对BDE-47均具有良好的去除性能；增大 BDE-47的初始浓度，2种材料对 BDE-47的吸附速率减小，而吸附量增大。准二级动力学方程能够较好的拟合BDE-47在Ni-La/CNTs和Ni-Co/CNTs上的吸附动力学过程，吸附速率常数大小顺序为：kCNTs > kNi-La/CNTs > kNi-Co/CNTs。CNTs对BDE-47的去除机制是吸附作用；而Ni-La/CNTs和Ni-Co/CNTs2种双金属复合材料对BDE-47的去除过程中，除了吸附作用占主要作用外，同时还存在一定的降解作用。Ni-La/CNTs和Ni-Co/CNTs重复使用4次后，对水中BDE-47的去除率仍超过80%，表明2种复合材料具有较好的重复使用性能。
채용침지법제비료탄납미관부재얼란(Ni-La)/얼고(Ni-Co)쌍금속복합재료Ni-La/CNTs화Ni-Co/CNTs，채용투사전자현미경(TEM)화X사선분말연사의(XRD)대양품적결구특정화조성진행료표정。병통과흡부실험탐토료Ni-La/CNTs화Ni-Co/CNTs대수중2,2′,4,4′-사추련분미(BDE-47)적거제성능화거제궤제。결과표명：Ni-La/CNTs화Ni-Co/CNTs표면부재료Ni-La혹Ni-Co쌍금속입자，주요시금속양화물，병몰유검측도명현적금속단질신호。Ni-La/CNTs화Ni-Co/CNTs대BDE-47균구유량호적거제성능；증대 BDE-47적초시농도，2충재료대 BDE-47적흡부속솔감소，이흡부량증대。준이급동역학방정능구교호적의합BDE-47재Ni-La/CNTs화Ni-Co/CNTs상적흡부동역학과정，흡부속솔상수대소순서위：kCNTs > kNi-La/CNTs > kNi-Co/CNTs。CNTs대BDE-47적거제궤제시흡부작용；이Ni-La/CNTs화Ni-Co/CNTs2충쌍금속복합재료대BDE-47적거제과정중，제료흡부작용점주요작용외，동시환존재일정적강해작용。Ni-La/CNTs화Ni-Co/CNTs중복사용4차후，대수중BDE-47적거제솔잉초과80%，표명2충복합재료구유교호적중복사용성능。
Nickel lanthanum/carbon nanotubes (Ni-La/CNTs) and nickel cobalt/carbon nanotubes (Ni-Co/CNTs) composites were prepared by impregnation method. The structure and composition of the Ni-La/CNTs and Ni-Co/CNTs were characterized by TEM and XRD. The removal mechanism of 2,2′,4,4′-tetrabromodiphenylether (BDE-47) by Ni-La/CNTs and Ni-Co/CNTs in water solution were also investigated. The results of TEM images indicated that the Ni-La or Ni-Co bimetallic nanoparticles were loaded onto the composites surfaces successfully with an average diameter in the range of (20~30) nm. The XRD results illustrated that the bimetallic nanoparticles were mainly Ni-La or Ni-Co oxides without demonstrable zero valent nickel, lanthanum and cobalt. Ni-La/CNTs and Ni-Co/CNTs had good removal performance for BDE-47 in water solution. When the initial concentration of BDE-47 increased to 1.0 mg·L-1, the removal rates decreased and the adsorption capacities increased. The possible reason was that the active sites of Ni-La/CNTs and Ni-Co/CNTs were limited and the sorption processes needed more time to reach equilibrium at higher initial BDE-47 concentration. The removal processes of BDE-47 onto Ni-La/CNTs and Ni-Co/CNTs could be fitted by the pseudo-second order kinetic model perfectly, the adsorption rate order waskCNTs > kNi-La/CNTs> kNi-Co/CNTs. Predominant adsorption and weak degradation were coexisted in the removal process of BDE-47 by Ni-La/CNTs and Ni-Co/CNTs while there was only adsorption onto CNTs. In addition, the Ni-La/CNTs and Ni-Co/CNTs composites had good regeneration performance and the removal rates were still more than 80 % after four regeneration cycles.