Amine grafted cellulose aerogel for CO 2 capture
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Amine grafted cellulose aerogel for CO2 capture Xing Jiang1 · Yong Kong1 · Huiru Zou1 · Zhiyang Zhao1 · Ya Zhong1 · Xiaodong Shen1
© Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract A cellulose aerogel (CA) was fabricated by a phase inversion induced sol-gel process along with supercritical drying. An amine grafted cellulose aerogel (AGCA) was prepared by grafting 3-aminopropyltriethoxysilane (APTES) onto the framework of the cellulose gel. The morphology, microstructure, pore structure and elemental composition of the CA and AGCA were characterized. Both CA and AGCA exhibited highly porous network consisting of fibrous network and nanopores. APTES grafting leaded to the blockage of the pore space of the CA and generated more nanopores. The specific surface area and pore volume of the AGCA is higher than those of the CA owing to the APTES grafting. The AGCA achieved a CO2 adsorption capacity of 1.20 mmol/g with dry 1% CO2, and exhibited excellent stability within 20 adsorption-desorption cycles Keywords Cellulose aerogel · Phase inversion · Sol–gel · Amine modification · CO2 adsorption
1 Introduction CO2 concentration in air is increasing at an accelerating rate in the past decades, which has given rise to worldwide climate issues and environment challenges. C O2 capture is a promising way to reduce the C O2 emissions. Porous adsorbents for CO2 capture have been intensively studied as they can overcome the shortcomings of amine scrubbing technology [1–3]. Among porous materials, aerogels have large specific surface areas, porosities and nanopore volumes, and inter-connective network, which favor the gas diffusion and gas-solid interaction during CO2 adsorption [4–7]. Furthermore, the surface chemical structure of the aerogels can be modified to achieve amine functionalization by different ways including wet impregnation, grafting and in-situ polymerization. Cui et al. developed amine modified silica aerogel by grafting 3-aminopropyltriethoxysilane (APTES) onto the silica gel, which achieved a CO2 adsorption capacity of 6.97 mmol/g in simulated flue gas [8]. Amine modified silica aerogel prepared by Wörmeyer et al. had a C O2 adsorption capacity of 1.07 mmol/g with 2500 ppm CO2 [9]. Linneen et al. developed tetraethylenepentamine (TEPA) functionalized silica aerogel for CO2 capture by wet impregation * Yong Kong [email protected] 1
College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, People’s Republic of China
of a silica aerogel, which had a CO2 adsorption capacity of 3.5 mmol/g with dry 10% C O2 [10, 11]. Wang et al. developed a polyethyleneimine (PEI) functionalized silsesquioxane aerogel with a adsorption capacity of 3.3 mmol/g from pure CO2 [12]. Kong et al. developed amine hybrid silica aerogels that achieved with high C O2 performances with wide CO2 concentrations [13–15]. These studies demonstrate that amine functionalized aerogels show excellent performances for CO2 capture, and most amine functionalized aerogels
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