Anionic porous organic frameworks as advanced functional adsorbents for CO2 and organic micropollutants in water

Abstract

New anionic porous organic frameworks with phosphate groups (PA-POFs) are synthesized through Yamamoto coupling reactions. These materials have excellent adsorption properties towards CO₂ compared to other porous organic frameworks. In addition, the materials have high adsorption capacity and exceptional adsorption kinetics towards bisphenol A (BPA) in water, a wide-spread organic pollutant and a known endocrine disruptor. The maximum adsorption capacity of BPA at equilibrium is found to be as high as 3366 mg g⁻¹ according to the Langmuir adsorption model, which is more than 10 times greater than those of peer materials. The polymer also rapidly removes various other organic micropollutants with more than 90% removal efficiencies. In addition, the PA-POF material can be regenerated at least five times by mild washing using methanol without significant loss in removal efficiency.