Reversible photoregulation of morphological structure for porous coumarin-graphene composite and the removal of heavy metal ions

In this study, a photoreversible graphene oxide (GO) - coumarin (GC) composite is fabricated by electrostatic self-assembly of positively charged nitrogenous coumarin surfactant and negatively charged GO. It is found that the introduction of coumarin not only results in a large amount of micropores and mesopores on the surface of GO, but photo-regulates its structure transformation between close-packed structure and 3D pleat-like structure,...