▎ 摘 要
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 mu g/L with multi-coexisting metal ions, the distribution coefficient (K-d) value of uranium(VI) was 2.29 x 10(4) mL/g, which determined that MIL-68/GO composites were a promising material for the enrichment of uranium(VI). (C) 2019 Published by Elsevier B.V. on behalf of Taiwan Institute of Chemical Engineers.