Facile synthesis of Fe3O4@MOF-100(Fe) magnetic microspheres for the adsorption of diclofenac sodium in aqueous solution
2018
Zheng, Xiang | Wang, Jinlin | Xue, Xiaolong | Liu, Wanxia | Kong, Yadong | Cheng, Rong | Yuan, Donghai
In this research, the adsorptive removal of diclofenac sodium, one of the representative pharmaceuticals and personal care products, from aqueous solution using Fe₃O₄@MOF-100(Fe) magnetic microspheres was studied for the first time. The Fe₃O₄@MOF-100(Fe) microspheres exhibit strong magnetism and stability, which were observed as a core-shell structure. The maximum adsorption capacity of Fe₃O₄@MOF-100(Fe) for diclofenac sodium can reach 377.36 mg L⁻¹, which was higher than most of the adsorbents reported. The adsorption kinetics follows the pseudo-second-order kinetic equation. And the adsorption equilibrium of DCF can be described with Langmuir isotherm. In the cycle experiment, Fe₃O₄@MOF-100(Fe) material performed high adsorption efficiency for low-concentration diclofenac sodium solution, and the removal rate can still reach 80% after 5 cycles of adsorption without desorption. The mechanisms including electrostatic interaction, H-bond interaction, and π-π interaction that coexisted in the adsorption processes would be of benefit to enhance the adsorption capacity. The Fe₃O₄@MOF-100(Fe) magnetic microspheres offer exciting opportunities for further application.
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