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- In relation to this article, we declare that there is no conflict of interest.
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Received May 21, 2024
Accepted September 2, 2024
Available online February 25, 2025
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
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Preparation of N-Enriched GO Adsorbents and Their Properties for Selective CO 2 Capture
https://doi.org/10.1007/s11814-024-00274-3
Abstract
In this work, GO adsorbents were fabricated based on the Hummers’ procedure and further chemically modifi ed with
3-aminopropyl-triethoxysilane (APTS) as primary amino-silane, piperazine (PIP) as a secondary cyclic diamine, and ethanolamine
(EA) as primary amine to enhance their CO 2 adsorption/separation properties. The adsorption characteristics of the
amine-functionalized adsorbents were assessed at diff erent temperatures and pressures. It was found that the aforementioned
functionalities highly infl uence the physical–chemical and textural properties of the prepared adsorbents. The experimental
isotherm data were analyzed by the Sips isotherm equation to describe the CO 2 adsorption isotherm. GO/APTS exhibited the
maximum CO 2 adsorption capacity of 43.114 mmol/g, based on the Sips isotherm model at 298 K. Accordingly, GO/APTS
showed ideal adsorbed solution theory selectivity (CO 2 /N 2 ) of 33.7. The adsorption mechanism of GO and amine-modifi ed
GO adsorbents can be described a physico-chemical adsorption, driven by the cooperation between nitrogen functional
groups and the fi lling of micropores. It was found that the CO 2 adsorption capacity for GO/APTS was 2.3 times higher than
the sorption capacity for unmodifi ed GO, confi rming the contributions of electron-donor amine and methyl groups, the high
molecular weight of APTS, and the high surface area of GO/APTS in enhancing CO 2 adsorption capacity.
References
3-aminopropyl-triethoxysilane (APTS) as primary amino-silane, piperazine (PIP) as a secondary cyclic diamine, and ethanolamine
(EA) as primary amine to enhance their CO 2 adsorption/separation properties. The adsorption characteristics of the
amine-functionalized adsorbents were assessed at diff erent temperatures and pressures. It was found that the aforementioned
functionalities highly infl uence the physical–chemical and textural properties of the prepared adsorbents. The experimental
isotherm data were analyzed by the Sips isotherm equation to describe the CO 2 adsorption isotherm. GO/APTS exhibited the
maximum CO 2 adsorption capacity of 43.114 mmol/g, based on the Sips isotherm model at 298 K. Accordingly, GO/APTS
showed ideal adsorbed solution theory selectivity (CO 2 /N 2 ) of 33.7. The adsorption mechanism of GO and amine-modifi ed
GO adsorbents can be described a physico-chemical adsorption, driven by the cooperation between nitrogen functional
groups and the fi lling of micropores. It was found that the CO 2 adsorption capacity for GO/APTS was 2.3 times higher than
the sorption capacity for unmodifi ed GO, confi rming the contributions of electron-donor amine and methyl groups, the high
molecular weight of APTS, and the high surface area of GO/APTS in enhancing CO 2 adsorption capacity.
