Synthesis of sandwich-like MnO@reduced graphene oxide nano-composites via modified Hummers' method and its application as uranyl adsorbents.

Efficient and sustainable remediation technologies for uranium have recently been gaining more and more interest. Adsorption techniques are facile, effective and universal for kinds of heavy metal ions. In this paper, sandwich-like MnO@reduced graphene oxide (MnO@G) nano-composites were prepared facilely and greenly by adding NaOH solution into crude graphite oxide suspension prepared via the Hummers' method to modify the pH. The MnO@G nanocomposites possess a reasonable maximum equilibrium adsorption quantity 195.6 mg [U] g. Moreover, the magnetism of MnO@G makes it easy to remove MnO@G from water by strong magnet field.