Synthesis and Properties of Nitrogen-Containing Conjugated Microporous Polymers

The nitrogen-containing conjugated microporous polymers (NCMPs) are synthesized by palladium-catalyzed Sonogashira–Hagihara crosscoupling condensation of 1,3,5-triethynylbenzene and bis(4-bromophenyl)amine. The resulting NCMP sample exhibits good chemical and thermal stability due to its rigid structure. The choice of reaction solvents has a major influence on the porosity of NCMPs. The high specific surface areas of 945 m2 g−1 and 593 m2 g−1 are obtained for NCMP-I and NCMP-III using toluene and 1,4-dioxane as solvent. Taking advantage of the good porous characters and the chemistry of amine groups, the NCMP-I and NCMP-III show superior adsorption performance for CO2 and metal ions. The adsorption capacity of NCMP-I and NCMP-III for Ni (II) is measured to be 384 mg g−1 and 362 mg g−1. Given these excellent metal ions uptake, ease of preparation, and good physiochemical stability, the as-synthesized NCMP samples show great potential in CO2 uptake and removal of metal ions.