Crown ether-based porous organic polymers for the removal of environmental pollutants in water

As the first generation of macrocyclic hosts, crown ethers have excellent host-guest recognition characteristics and are widely used in molecular recognition, catalysis, drug delivery and other fields. Porous organic polymers (POPs) with adjustable porosity and stable network structure have become advanced materials for molecular storage, heterogeneous catalysis, water purification and energy storage. In recent years, crown ether-based porous organic polymers have attracted extensive attention due to their excellent performance, which combine supramolecular hosts with traditional polymer, and have created a new field for supramolecular chemistry and material science. In this review, we discusses the research status of crown ether-based porous organic polymers in structure and pollutant adsorption, including selective adsorption of metal ions in water and removal of organic pollutants, and prospected the promising applications and future development direction of crown ether-based porous organic polymers.