Research Group for Surfaces and Nanostructures, University of Pannonia, Veszprém, Hungary.
Department of Chemical and Petroleum Refining Engineering/College of Oil and Gas Engineering, Basrah University, Basra, Iraq.
Environ Sci Pollut Res Int. 2021 Jun;28(22):28428-28443. doi: 10.1007/s11356-020-12170-4. Epub 2021 Feb 4.
The main objective of this work is to produce an eco-friendly and economically nano-adsorbent which can separate scandium metal ions Sc from a model aqueous phase prior to applying these adsorbents in industrial filed. The magnetic core-shell structure FeO@SiO nanoparticles were synthesized by modified Stöber method and functionalized with (3-aminopropyl) triethoxysilane APTES as a coupling agent and ethylenediaminetetraacetic acid (EDTA) as a ligand. Magnetic nano support adsorbents exhibit many attractive opportunities due to their easy removal and possibility of reusing. The ligand grafting was chemically robust and does not appreciably influence the morphology or the structure of the substrate. To evaluate the potential, the prepared hybrid nanoparticles were used as nano-adsorbent for Sc ions from model aqueous solutions due to the fact that rare earth elements (REEs) have a strong affinity for oxygen and nitrogen donors. The iron oxide nanoparticles were prepared by co-precipitation method at pH 10 and pH 11 to get the best morphology and nanoscale dimensions of iron oxide magnetic nanoparticles. The particle size, morphology, specific surface area, and surface modification were characterized by transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), vibrating sample magnetometer (VSM), and X-ray powder diffraction (XRD). The results showed that the FeO nanoparticles with average particle size of 15 ± 3 nm were successfully synthesized at pH 11, and 25 °C. Moreover, the prepared FeO nanoparticles were coated with amorphous SiO and functionalized with amino and carboxyl groups. The adsorption study conditions of Sc are as follows: the initial concentrations of the Sc model solution varied 10-50 mg/L, 20 mL volume, 20-80 mg of the FeO@SiO-COO adsorbent, pH range of 1-5, and 5 h contact time at 25 °C temperature. The adsorption equilibrium was represented with Langmuir, Freundlich, and Temkin isotherm models. Langmuir model was found to have the correlation coefficient value in good agreement with experimental results. However, the adsorption process followed pseudo-second-order kinetics.
这项工作的主要目的是制备一种环保且经济的纳米吸附剂，用于从模拟水相中分离钪金属离子 Sc，然后将这些吸附剂应用于工业领域。采用改进的 Stöber 法合成了具有核壳结构的 FeO@SiO2 纳米粒子，并通过（3-氨丙基）三乙氧基硅烷（APTES）作为偶联剂和乙二胺四乙酸（EDTA）作为配体进行功能化。磁性纳米载体吸附剂由于易于去除和可能重复使用，因此具有许多吸引人的优势。配体接枝具有化学稳定性，并且不会显著影响基底的形态或结构。为了评估潜在的应用价值，由于稀土元素（REEs）对氧和氮供体具有很强的亲和力，因此将制备的杂化纳米粒子用作模型水溶液中 Sc 离子的纳米吸附剂。采用共沉淀法在 pH 10 和 pH 11 下制备氧化铁纳米粒子，以获得氧化铁磁性纳米粒子的最佳形态和纳米尺寸。通过透射电子显微镜（TEM）、傅里叶变换红外光谱（FT-IR）、振动样品磁强计（VSM）和 X 射线粉末衍射（XRD）对粒径、形貌、比表面积和表面改性进行了表征。结果表明，在 pH 11 和 25°C 下成功合成了平均粒径为 15±3nm 的 FeO 纳米粒子。此外，所制备的 FeO 纳米粒子被无定形 SiO 包覆，并被氨基和羧基官能化。Sc 的吸附研究条件如下：Sc 模型溶液的初始浓度为 10-50mg/L，体积为 20mL，FeO@SiO-COO 吸附剂用量为 20-80mg，pH 范围为 1-5，在 25°C 下接触时间为 5h。吸附平衡分别用 Langmuir、Freundlich 和 Temkin 等温模型来表示。发现 Langmuir 模型与实验结果具有良好的相关性。然而，吸附过程遵循准二级动力学。
