Metal-organic frameworks (MIL-68) decorated graphene oxide for highly efficient enrichment of uranium

Add time:09/06/2019    Source:sciencedirect.com

A novel adsorbent, metal organic framework (MIL-68) decorated graphene oxide (MIL-68/GO) composites were prepared in this study. The synthesized sorbent was well-characterized by Transmission Electron Microscope (TEM), X-ray Diffraction (XRD) and Fourier Transform Infrared Spectroscopy (FTIR), which confirmed the MIL-68/GO composites were synthesized successfully. The effects of initial uranium (VI) concentration, temperature, pH and contact time on uranium (VI) sorption behaviour were systematically studied by a series of adsorption experiments. The results showed that the optimal pH was 8. The Langmuir model showed better correlation with the isotherm data, the maximum adsorption capacity was 594.66 mg/g at 298.15 K. The adsorption process fitted well with a pseudo-second-order model. Furthermore, the MIL-68/GO composites also showed good adsorption properties in simulated seawater. At the uranium(VI) concentration 3 µg/L with multi-coexisting metal ions, the distribution coefficient (Kd) value of uranium(VI) was 2.29 × 104 mL/g, which determined that MIL-68/GO composites were a promising material for the enrichment of uranium(VI).

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