A well-defined magnetic metal organic frameworks (MOFs)/graphene oxide (FeO@HKUST-1/GO) consisting of magnetic FeO nanoparticles, HKUST-1 nanocrystal and GO was synthesized through a simple and environmentally friendly approach. Characterizations of FeO@HKUST-1/GO adsorbing U(VI) with high-resolution transmission electron microscopy suggested that the FeO@HKUST-1/GO possessed good stability. The introduction of GO enhanced the ability of particles to uptake U(VI) from aqueous solution. The effects of solution pH, contact time and temperature on U(VI) adsorption were systematically tested by intermittent experiments. The adsorption process can be better described by the Langmuir model and the pseudo-second-order kinetic model. The results showed that the FeO@HKUST-1/GO exhibited good adsorption capacity towards U(VI) at the initial solution pH value of 4.0 and T = 318 K. The X-ray photoelectron spectroscopy was used to analyze the U(VI) removal mechanism. This work represents the application of FeO@HKUST-1/GO as a novel adsorbent to extract U(VI) from contaminated water.
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