γ-Cyclodextrin Porous Aromatic Frameworks Applied to Capture CO_2

According to the famous chemist Yaghi′s theory,hydroxyl group possesses the specific adsorption for CO2.In this paper,we report the synthesis of novel γ-cyclodextrin porous aromatic frameworks(CD-PAF-1) based on γcyclodextrin as building units with hydroxyl dehydration reaction.The material was characterized by fourier transform infrared spectroscopy(FTIR),thermogravimetric analysis(TGA),powder X-ray diffraction(PXRD),scanning electron microscopy(SEM),CO2and N2 gas sorption.A TG analysis showed that CD-PAF-1 is thermally stable up to 220 ℃ in air.CD-PAF-1 also has a high chemical stability and cannot be dissolved or decomposed in common solvents or concentrated hydrochloric acid.As we designed,hydroxyl groups in the skeletons adsorb a large amount of CO2.However,they do not adsorb N2 gas molecules.According to these features,CD-PAF-1 may be applied to capture and separate CO2in industry.