College of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences, 19(A) Yu Quan Road, Beijing, 100049, China.
Environ Sci Pollut Res Int. 2014 Feb;21(3):1671-1679. doi: 10.1007/s11356-013-2041-y. Epub 2013 Aug 16.
A facile one-pot process has been proposed to prepare the novel ethylenediaminetetraacetic acid (EDTA)-modified magnetite nanoparticles (EDTA-MNPs). The bared Fe3O4 magnetite nanoparticles and EDTA-MNPs were characterized using FTIR spectroscopy, TEM, VSM, and X-ray diffraction. The application of the modified magnetite nanoparticles for metal ion uptake was studied using Ni(2+) as a model. The adsorption was fast and the equilibrium was established within 5 min, and the adsorption kinetics of Ni(2+) onto EDTA-MNPs followed the pseudo second-order chemisorption mechanism. Maximum adsorption capacity for Ni(2+) reached as high as 41.3 mg/g at pH 6. The successive adsorption-desorption studies indicated that the EDTA-MNPs kept the adsorption and desorption efficiencies constant over ten cycles. Importantly, EDTA-MNPs were able to remove nearly 100 % of Ni(2+) from real water.
一种简单的一锅法被提出用来制备新型乙二胺四乙酸（EDTA）修饰的磁铁矿纳米粒子（EDTA-MNPs）。裸露的 Fe3O4 磁铁矿纳米粒子和 EDTA-MNPs 采用傅里叶变换红外光谱（FTIR）、透射电子显微镜（TEM）、振动样品磁强计（VSM）和 X 射线衍射（XRD）进行了表征。采用 Ni(2+)作为模型研究了改性磁铁矿纳米粒子对金属离子的吸附作用。吸附速度很快，5 分钟内达到平衡，Ni(2+)在 EDTA-MNPs 上的吸附动力学符合准二级化学吸附机制。在 pH 值为 6 时，Ni(2+)的最大吸附容量高达 41.3 mg/g。连续的吸附-解吸研究表明，EDTA-MNPs 在十个循环中保持吸附和解吸效率的恒定。重要的是，EDTA-MNPs 能够从实际水样中去除近 100%的 Ni(2+)。
