†Department of Applied Chemistry, Indian School of Mines, Dhanbad, Jharkhand 826 004, India.
‡Functional Nanomaterials Research Laboratory, Department of Applied Physics, Indian School of Mines, Dhanbad, Jharkhand 826 004, India.
Environ Sci Technol. 2015 May 19;49(10):6117-26. doi: 10.1021/acs.est.5b00182. Epub 2015 Apr 30.
In this study, nanocomposite of graphene oxide and silane modified magnetic nanoparticles (silane@Fe3O4) were synthesized in a form of dendritic structure. For this, silane@Fe3O4 nanoparticle gets sandwiched between two layers of graphene oxide by chemical synthesis route. The synthesized dendritic structure was used as a monomer for synthesis of europium ion imprinted polymer. The synthesis of imprinted polymer was contemplated onto the surface of the vinyl group modified silica fiber by activated generated free radical atom-transfer radical polymerization, that is, AGET-ATRP technique. The synthesized dendritic monomer was characterized by XRD, FT-IR, VSM, FE-SEM, and TEM analyses. The imprinted polymer modified silica fiber was first validated in the aqueous and blood samples for successful extraction and detection of europium ion with limit of detection = 0.050 pg mL(-1) (signal/noise = 3). The imprinted polymer modified silica fiber was also used for preconcentration and separation of europium metal ion from various soil samples of coal mine areas. However, the same silica fiber was also used for wastewater treatment and shows 100% performance for europium removal. The findings herein suggested that dendritic nanocomposite could be potentially used as a highly effective material for the enrichment and preconcentration of europium or other trivalent lanthanides/actinides in nuclear waste management.
在这项研究中，氧化石墨烯和硅烷改性磁性纳米粒子（硅烷@Fe3O4）的纳米复合材料被合成为树枝状结构。为此，通过化学合成路线，硅烷@Fe3O4 纳米颗粒被夹在两层氧化石墨烯之间。合成的树枝状结构被用作合成铕离子印迹聚合物的单体。印迹聚合物的合成被考虑到乙烯基改性硅胶纤维的表面上，通过活性自由基原子转移自由基聚合（即 AGET-ATRP 技术）。合成的树枝状单体通过 XRD、FT-IR、VSM、FE-SEM 和 TEM 分析进行了表征。印迹聚合物修饰的硅胶纤维首先在水和血液样品中进行了验证，成功地提取和检测了铕离子，检测限=0.050 pg mL(-1)（信号/噪声=3）。印迹聚合物修饰的硅胶纤维还用于从煤矿区的各种土壤样品中预浓缩和分离铕金属离子。然而，同样的硅胶纤维也用于废水处理，并显示出 100%的铕去除性能。研究结果表明，树枝状纳米复合材料可能被用作核废料管理中富集和预浓缩铕或其他三价镧系/锕系元素的高效材料。
