Key Laboratory of New Processing Technology for Nonferrous Metal and Materials (Ministry of Education), Guangxi Scientific Experiment Center of Mining, Metallurgy and Environment, and College of Material Science and Engineering, Guilin University of Technology , Guilin 541004, Guangxi, China.
ACS Appl Mater Interfaces. 2013 Sep 11;5(17):8678-85. doi: 10.1021/am402334f. Epub 2013 Aug 26.
Magnetic iron oxide nanoparticles (MIONs) bearing amine and vinyl groups are fabricated straightforwardly using vinyl-based tertiary amine molecules as both alkaline source and ligands based on the coprecipitation of iron ions in aqueous solution. The as-prepared MIONs present amphiphilic performance that can be well-dispersed both in aqueous solution and common organic solvents (e.g., ethanol, dichloromethane and tetrahydrofuran). Transmission electron microscopy (TEM), X-ray diffraction (XRD), and vibrating sample magnetometer (VSM) measurements reveal that the MIONs are superparamagnetic Fe3O4 nanoparticles with a mean diameter below 10 nm. The presence of ligands on the surface of MIONs was confirmed by thermogravimetric analysis (TGA), Fourier transform infrared (FTIR), and X-ray photoelectron spectroscopy (XPS) characterizations. Benefiting from the surface vinyl groups, the MIONs are able to graft polyvinyl-based polymers by in situ polymerization of the corresponding vinyl monomers as confirmed by grafting poly(methyl methacrylate) (PMMA) in this paper. On the basis of their surface amine groups, the MIONs show high adsorption capacity (ca. 0.42 mmol/g) for congo red dye and excellent performance for in situ growth of Pt nanocatalyst. Moreover, the MIONs possess high stability and can be reused several times without obvious decrease of their adsorption capacity and catalytic efficiency. Considering the facile fabrication process and versatile performance of the obtained MIONs, this work may open up new opportunities for the large-scale applications of MIONs.
磁性氧化铁纳米粒子（MIONs）带有胺基和乙烯基，可通过在水溶液中沉淀铁离子，使用基于乙烯基的叔胺分子作为碱性源和配体，直接制备出带有胺基和乙烯基的 MIONs。所制备的 MIONs 具有两亲性，可以很好地分散在水溶液和常见有机溶剂（如乙醇、二氯甲烷和四氢呋喃）中。透射电子显微镜（TEM）、X 射线衍射（XRD）和振动样品磁强计（VSM）测量表明，MIONs 是超顺磁性 Fe3O4 纳米粒子，平均直径低于 10nm。TGA、傅里叶变换红外（FTIR）和 X 射线光电子能谱（XPS）表征证实了 MIONs 表面配体的存在。由于表面乙烯基的存在，MIONs 能够通过相应的乙烯基单体的原位聚合接枝基于聚乙烯的聚合物，本文通过接枝聚甲基丙烯酸甲酯（PMMA）进行了证实。基于其表面胺基，MIONs 对刚果红染料具有高吸附能力（约 0.42mmol/g），并且对 Pt 纳米催化剂的原位生长表现出优异的性能。此外，MIONs 具有高稳定性，可重复使用数次，而其吸附能力和催化效率没有明显下降。考虑到所获得的 MIONs 的简单制造工艺和多功能性能，这项工作可能为 MIONs 的大规模应用开辟新的机会。
