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First Author: HUO Jiang-Bo
Abstract:

Facile fabrication of magnetic metal-organic frameworks (MOFs) using a direct epitaxial approach for eliminating arsenic from water is highly desirable. Herein, a two-step solvothermal method of elegant design is proposed to synthesize Fe3O4@UiO-66. Such resulting composite was systematically characterized using powder X-ray diffraction (PXRD), Fourier transform infrared (FTIR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), N2 adsorption-desorption isotherms, and thermogravimetric analysis (TGA). Results clearly reveal that this novel composite exhibits a unique core-shell structure with high specific surface area and plentiful micropores as well as good thermal stability. Specifically, batch adsorption data for arsenate demonstrate that a pseudo-second order kinetic model (R2=0.9996) better describes this adsorption process than a pseudo-first order model (R2=0.8582), revealing the chemical interaction between the composite and arsenate. The Freundlich model with better coefficient (R2=0.9566) further verified multi-layer heterogeneous adsorption, which may be ascribed to the unique core-shell structure of this composite (Fe3O4@UiO-66). Its excellent adsorption performance for arsenate (73.2mg (As) g-1 (adsorbent)) is comparable to most MOFs-containing adsorbents but is also magnetic, allowing for ready separation of the composite from aqueous solution. Given this combination of qualities, this new composite could offer a promising alternative for wastewater remediation.

Facile fabrication of magnetic composite based on UiO-66 for efficient removal of As(V) from water with easy separation after the adsorption.

Fig. 3. SEM of Fe3O4 (a, b) and Fe3O4@UiO-66 (d, e); and TEM of Fe3O4 (c) and Fe3O4@UiO-66 (f).

Contact the author: FU Ming-Lai
Page Number: 68-75
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PubYear: MAR 2019
Volume: 276
Publication Name: MICROPOROUS AND MESOPOROUS MATERIALS
The full text link: https://doi.org/10.1016/j.micromeso.2018.09.017
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