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Synthesis of Fe3O4@TiO2 core–shell magnetic composites for highly efficient sorption of uranium (VI)

Author:
Tan, Lichao, Zhang, Xiaofei, Liu, Qi, Jing, Xiaoyan, Liu, Jingyuan, Song, Dalei, Hu, Songxia, Liu, Lianhe, Wang, Jun
Source:
Colloids and Surfaces A: Physicochemical and Engineering Aspects 2015 v.469 pp. 279-286
ISSN:
0927-7757
Subject:
X-ray diffraction, adsorbents, adsorption, aqueous solutions, magnetic fields, pH, scanning electron microscopy, sorption isotherms, thermodynamics, transmission electron microscopy, uranium
Abstract:
Adsorption of uranium (VI) from aqueous solution by Fe3O4@TiO2 composites was studied by batch experiments. The adsorbent was characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction and magnetic measurements. The adsorptions of uranium (VI) from aqueous solution on Fe3O4@TiO2 were fitted to the Langmuir and Freundlich adsorption isotherms. The adsorption of uranium (VI) could be well-described by Langmuir. The maximum sorption capacity of Fe3O4@TiO2 for uranium (VI) was evaluated to be 118.8mgUg−1 at pH 6.0. Thermodynamic parameters further showed that the sorption was an endothermic and spontaneous process. The uranium (VI)-loaded Fe3O4@TiO2 could be readily separated from aqueous solutions by an external magnetic field. Results suggested that Fe3O4@TiO2 was a powerful promising sorbent for the efficient removal of uranium (VI) from aqueous solutions.
Agid:
5528658