Selective Uptake of Rare Earths from Aqueous Solutions by EDTA-Functionalized Magnetic and Nonmagnetic Nanoparticles
Selective Uptake of Rare Earths from Aqueous Solutions by EDTA-Functionalized Magnetic and Nonmagnetic Nanoparticles
复制标题
DOI：
10.1021/am406027y
复制
发表时间：
2014-04-09
影响因子：
9.5
通讯作者：
Binnemans, Koen
中科院分区：
文献类型：
--
作者：
Dupont, David;Brullot, Ward;Binnemans, Koen
用N-[（3-三甲氧基硅基）丙基]乙二胺三乙酸（TMS-EDTA）修饰磁性（Fe3O4）和磁性（SiO2和TiO2）纳米粒子。目的是研究这些固定化的金属配位基团的行为上的基板的影响。将表面修饰有TMS-EDTA的纳米粒子用于水溶液中三价稀土离子的吸附分离。由于其大的表面积，纳米颗粒的一般吸附容量非常高（100至400 mg/g）。已知重稀土离子比轻稀土离子对配位基团具有更高的亲和力，但在不同纳米颗粒之间观察到选择性的额外差异。对稀土离子的分离被认为是依赖于基板，即表面上的EDTA基团的密度。固定化配体的空间位阻（或拥挤）影响选择性的观察可以为传统螯合配体的配位能力的微调提供新的工具。
Magnetic (Fe3O4) and nonmagnetic (SiO2 and TiO2) nanoparticles were decorated on their surface with N-[(3-trimethoxysily)propyl]ethylenediamine triacetic acid (TMS-EDTA). The aim was to investigate the influence of the substrate on the behavior of these immobilized metal coordinating groups. The nanoparticles functionalized with TMS-EDTA were used for the adsorption and separation of trivalent rare-earth ions from aqueous solutions. The general adsorption capacity of the nanoparticles was very high (100 to 400 mg/g) due to their large surface area. The heavy rare-earth ions are known to have a higher affinity for the coordinating groups than the light rare-earth ions but an additional difference in selectivity was observed between the different nanoparticles. The separation of pairs of rare-earth ions was found to be dependent on the substrate, namely the density of EDTA groups on the surface. The observation that sterical hindrance (or crowding) of immobilized ligands influences the selectivity could provide a new tool for the fine-tuning of the coordination ability of traditional chelating ligands.