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

Tan, Lichao, Zhang, Xiaofei, Liu, Qi, Jing, Xiaoyan, Liu, Jingyuan, Song, Dalei, Hu, Songxia, Liu, Lianhe, Wang, Jun
Colloids and Surfaces A: Physicochemical and Engineering Aspects 2015 v.469 pp. 279-286
X-ray diffraction, adsorbents, adsorption, aqueous solutions, magnetic fields, pH, scanning electron microscopy, sorption isotherms, thermodynamics, transmission electron microscopy, uranium
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.