▎ 摘　　要

Novel three-dimensional porous graphene-Co3O4 nanocomposites were synthesized by freeze-drying methods. Scanning and transmission electron microscopy revealed that the graphene formed a three-dimensional porous structure with Co3O4 nanoparticles decorated surfaces. The as-obtained product showed high photocatalytic efficiency and could be easily separated from the reaction medium by magnetic decantation. This nanocomposite may be expected to have potential in water purification applications. (C) 2015 Elsevier B.V. All rights reserved.