Main content area

Preparation and characterization of magnetic nanomaterial and its application for removal of polycyclic aromatic hydrocarbons

Zhou, Qingxiang, Wang, Yuqin, Xiao, Junping, Fan, Huili, Chen, Chunmao
Journal of hazardous materials 2019 v.371 pp. 323-331
Fourier transform infrared spectroscopy, X-ray diffraction, adsorbents, adsorption, benzo(a)pyrene, endothermy, iron oxides, magnetism, microstructure, models, nanoparticles, polycyclic aromatic hydrocarbons, polymerization, polymers, scanning electron microscopy, sorption isotherms, thermodynamics, transmission electron microscopy, van der Waals forces
Fe3O4@polyaniline, a Fe3O4-based magnetic core-shell material, was synthesized and its morphology and microstructure were characterized with transmission electron microscopy, scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray diffraction, and vibrating sample magnetometry. Polyaniline was modified onto the surface of Fe3O4 nanoparticles by a self-assembly method based on a two-step oxidative polymerization method. The new materials exhibited good adsorption to polycyclic aromatic hydrocarbons such as fluoranthene, pyrene and benzo[a]pyrene from environmental water samples due to the high affinities of polyaromatic hydrocarbons to polyaniline via π−π and van der Waals interactions. The experimental results indicate that the adsorption of polyaromatic hydrocarbons follows pseudo-second order kinetics and the adsorption isotherms conform to a Langmuir isotherm model. The thermodynamic parameters for polyaromatic hydrocarbons indicate that the adsorption process is spontaneous and endothermic in nature, but adsorption occurs via non-covalent interactions. This study indicated that the Fe3O4@polyaniline hybrid core-shell structure was proved to be a good adsorbent for polyaromatic hydrocarbons while exhibiting simple preparation, easy separation, low cost, high reusability and great potential applicability for removal of polyaromatic hydrocarbons from water.