COFs were used as support for the in-situ growth of palladium nanocrystals (Pd NCs@COF) . Pd NCs@COF was used as the catalyst for carbon-carbon coupling reactions with high efficiency and excellent selectivity . A composite of COFs material with twodimensional nanoparticles e.g., graphene oxide, boron nitride, and graphitic carbon nitride (g-C3N4) was synthesized via a one-pot procedure . The nanocomposites were used in water treatment via organic pollutants adsorption .