Effective carbon dioxide (CO2) capture requires solid, porous sorbents with chemically and thermally stable frameworks. Herein, we report two new carbon–carbon bonded porous networks that were synthesized through metal-free Knoevenagel nitrile–aldol condensation, namely the covalent organic polymer, COP-156 and 157. COP-156, due to high specific surface area (650 m2/g) and easily interchangeable nitrile groups, was modified post-synthetically into free amine- or amidoxime-containing networks. The modified COP-156-amine showed fast and increased CO2 uptake under simulated moist flue gas conditions compared to the starting network and usual industrial CO2 solvents, reaching up to 7.8 wt % uptake at 40 °C.
有效的二氧化碳(CO2)捕集需要具有化学和热稳定框架的固体多孔吸附剂。在此,我们报告了通过无金属Knoevenagel腈-醛缩合合成的两种新的碳-碳键合多孔网络,即共价有机聚合物COP-156和157。由于高比表面积(650 m2/g)和易于交换的腈基团,COP-156被后合成改性为自由胺或酰肟基含量的网络。改性后的COP-156-胺在模拟湿烟气条件下与起始网络和通常的工业CO2溶剂相比,表现出更快和更高的CO2吸收,达到40℃下7.8 wt%的吸收率。