An ultrathin covalent organic framework (COF) was constructed homogeneously on the surface of a graphene template via a facile hydrothermal method, as reported by Freddy Kleitz and co-workers in their Research Article (e202206564). Benefitting from the maximum exposure of active sites and sufficient interaction with target water pollutants, the ultrathin COF could effectively shorten the equilibrium time and increase the adsorption capacity for the removal of organic dyes with various sizes.