Differentiation of Chemisorption and Physisorption of Carbon Dioxide on Imidazolium-type Poly(ionic liquid)Brushes  

作　　者：ZHANG Dongyu QU Rong ZHANG Haining ZHANG Fangfang 张东豫;QU Rong;ZHANG Haining;张方方(Technology Center,China Tobacco Henan Industrial Co.Ltd.,Zhengzhou 450000,China;Non-power Nuclear Technology Collaborative Innovation Center,Hubei University of Science and Technology,Xianning 437100,China;State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]Technology Center,China Tobacco Henan Industrial Co.Ltd.,Zhengzhou 450000,China [2]Non-power Nuclear Technology Collaborative Innovation Center,Hubei University of Science and Technology,Xianning 437100,China [3]State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430070,China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2020年第4期750-757,共8页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the National Natural Science Foundation of China(No.21878239)。

摘　　要：Amine-functionalized imidazolium-based poly(ionic liquid)brushes on mesoporous silica were synthesized via"grafting through"technique and were applied as model sorbents to understand physisorption and chemisorption of carbon dioxide molecules.The experimental results reveal that the total adsorption capacity of model sorbents derived from temperature programmed desorption(TPD)approach reaches 1.72 mmol·g^-1 that is much higher than the sum of adsorption capacity of bare mesoporous silica and free polymers at 25℃under carbon dioxide partial pressure of 0.2 bar.The proposed physical adsorption and chemical adsorption of carbon dioxide molecules in TPD response curves were validated by volumetric desorption measurement.It is also observed that physical adsorption is completely reversible and chemical adsorption is irreversible.The results demonstrate that the temperature programmed desorption technique is an effective approach to differentiate chemisorption and physisorption of gaseous species on solid sorbents,which is beneficial for understanding of adsorption mechanism and materials design.

关 键 词：adsorption surface-attachment poly(ionic liquid) grafting through carbon dioxide 

分 类 号：O647.3[理学—物理化学]