Differentiation of Chemisorption and Physisorption of Carbon Dioxide on Imidazolium-type Poly(ionic liquid) Brushes
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https: //doi. org/10.1007/s11595-020-2317-2
Differentiation of Chemisorption and Physisorption of Carbon Dioxide on Imidazolium-type Poly(ionic liquid) Brushes ZHANG Dongyu1,2, QU Rong3, ZHANG Haining3, ZHANG Fangfang2*
(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)
Abstract: 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. Key words: adsorption; surface-attachment; poly(ionic liquid); grafting through; carbon dioxide
1 Introduction The gradually aggravated greenhouse effect induced by the increased carbon dioxide (CO 2 ) emission has led to the treatment of carbon dioxide imminent[1]. The solution to environmental problems caused by carbon dioxide emissions is mainly focused on the separation and capture of carbon dioxide. Thus, the development of carbon dioxide capture and storage (CCS) technologies is of great importance[2]. Of the various CCS technologies, the post-combustions capture is the often-used approach for adsorption of CO2[3]. The capture of carbon dioxide after combustion is primarily addressed according to physical adsorption, membrane adsorption, and chemisorption, among which the alkaline amine-based chemisorption is the practically and commercially applied method. However, drawbacks existed including the high© Wuhan University of Technology and Springer-Verlag GmbH Germany, Part of Springer Nature 2020 (Received: Feb. 20, 2020; Accepted: Apr. 12, 2020) ZHANG Dongyu(张东豫): Engineerer; E-mail: 876295301@ qq.com *Corresponding author: ZHANG Fangfang(张方方): Lecturer; E-mail: [email protected] Funded by the National Natural Science Foundation of China(No. 21878239)
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