▎ 摘　　要

In this work, MnO2 nanotubes@reduced graphene oxide hydrogel (MNGH) was prepared via one-step hydrothermal co-assembly approach. The as-prepared MNGH exhibited three-dimensional (3D) architecture with a high surface area of 156 m(2) g(-1). By characterization of the morphology of MNGH, MnO2 nanotubes with uniform size (similar to 20 nm) were wrapped by interconnected porous reduced graphene oxide (rGO) sheets. Benefiting from the 3D porous nanostructure as well as the synergetic action between rGO and MNTs, the MNGH sample showed decent adsorption ability for various heavy metal ions (Pb2+, Cd2+, Ag+, Cu2+ and Zn2+). Especially, the adsorption capacity of Pb2+ on MNGH can reach 356.37 mg g(-1) and the sorption datum fits the Langmuir model. Moreover, the adsorption performance of MNGH can be maintained after multiple regeneration experiments. These results demonstrated that the as-prepared MNGH could be applied as the promising adsorbent for removal of heavy metal ions.