环糊精类多孔材料对气体CO2的捕获研究

摘要

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 ycyclodextrin 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),CO2 and 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 CO2 in industry.%本报导中,以γ-环糊精作为建筑基块,采用最常见的醇羟基脱水反应,合成了一种环糊精类多孔材料CD-PAF-1,通过FTIR,TGA,PXRD,SEM及气体吸附对该化合物的结构及性质进行表征,CD-PAF-1具有优良的热稳定性.另外,由于成功地在该材料骨架中引入了大量对CO2具有选择性吸附的羟基基团,基于这一特点,该材料可广泛的应用于气体CO2的捕获与分离应用.