College of Chemical Engineering, Beijing University of Chemical Technology, No. 15, North Third Ring Road East, Beijing 100029, People's Republic of China.
College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, No. 15, North Third Ring Road East, Beijing 100029, People's Republic of China.
Sci Total Environ. 2020 Jan 10;699:134334. doi: 10.1016/j.scitotenv.2019.134334. Epub 2019 Sep 7.
FeO magnetic nanoparticles were prepared by hydrothermal synthesis and their surface was modified by the sol-gel method. Polymers imprinted with magnetic Cr (VI) were prepared by using CrO as template ion, 4-vinyl pyridine (4-VP) as monomer, isopropanol as solvent and FeO as matrix. The effects of solvent type, amount of Cr (VI) addition and volume of crosslinking agent on the adsorption properties of the imprinted polymers were investigated. The polymers were characterized by Fourier transform infrared (FT-IR) spectroscopy, transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and thermogravimetric analysis (TGA). The adsorption equilibrium was reached within 50 min, and the maximum adsorption capacity was 201.55 mg·g. The adsorption process conformed to the Langmuir model, and the results of kinetic fitting showed that the pseudo-first-order kinetic model applied. In the CrO/AlF and CrO/CrO competitive systems, the imprinted polymer showed good selectivity to the template ions, with relative selectivity factors of 6.91 and 5.99, respectively. When the imprinted polymer was reused 6 times, the adsorption capacity decreased by only 8.2%, demonstrating good reusability.
FeO 磁性纳米粒子通过水热合成制备，其表面通过溶胶-凝胶法进行修饰。采用 CrO 作为模板离子、4-乙烯基吡啶（4-VP）作为单体、异丙醇作为溶剂、FeO 作为基体，通过原位聚合法制备了对磁性 Cr(VI) 具有印迹性能的聚合物。考察了溶剂种类、Cr(VI) 添加量和交联剂体积对印迹聚合物吸附性能的影响。通过傅里叶变换红外光谱（FT-IR）、透射电子显微镜（TEM）、X 射线光电子能谱（XPS）和热重分析（TGA）对聚合物进行了表征。吸附平衡在 50 min 内达到，最大吸附容量为 201.55 mg·g。吸附过程符合 Langmuir 模型，动力学拟合结果表明适用于准一级动力学模型。在 CrO/AlF 和 CrO/CrO 竞争体系中，印迹聚合物对模板离子表现出良好的选择性，相对选择性因子分别为 6.91 和 5.99。当印迹聚合物重复使用 6 次时，吸附容量仅下降了 8.2%，表现出良好的可重复使用性。
