In the present work, we reported the preparation of a highly porous phosphate-functionalized graphene (HGP) hydrogel electrode material by a two-step process for uranium (U(VI)) electrosorption. The extra pores were pre-created on graphene nanosheets by a simple H 2 O 2 etching reaction, and then the as-formed holy graphene nanosheets (HG) were assembled into a 3D macrostructure using phytic acid as both gelator and modifier. The interconnected 3D network structure with the hierarchical pores, as well as the abundant phosphate groups, endowed t...
