| Autor: |
Peng Tan, Qiu-Rong Wu, Yao Jiang, Xiao-Qin Liu, Shi-Chao Qi, Chen Gu, Lin-Bing Sun, Qiang Zhang |
| Rok vydání: |
2022 |
| Předmět: |
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| Zdroj: |
Chinese Journal of Chemical Engineering. 42:104-111 |
| ISSN: |
1004-9541 |
| DOI: |
10.1016/j.cjche.2021.07.010 |
| Popis: |
Amines in porous materials have been employed as active species for the selective CO2 adsorption from natural gas because of their target-specific interactions. Nevertheless, it is difficult to modulate such strong interactions to reach a high efficiency in the adsorption processes. Herein, we fabricated light-responsive adsorbents with tunable adsorbent–adsorbate interactions for CO2 capture. The adsorbents were synthesized by introducing primary and secondary amines into a mesoporous silica that had been grafted with azobenzene groups on the surfaces. The target-specific amine sites render the adsorbents significantly selective in the uptake of CO2 over CH4, and the azobenzene groups were used as light-responsive switches to influence the adsorbent–adsorbate interactions. The adsorbents can freely adsorb CO2 when the azobenzene groups are in the trans state. Ultraviolet-light irradiation makes the azobenzene groups transform to the cis configuration, which greatly hinders amines in the uptake of CO2. The caused difference of adsorption capacity can reach 34.9%. The alternative irradiation by ultraviolet- and visible-light can lead to a recyclable regulation on adsorption performance. The changes of the electrostatic potentials of amines are responsible for the light-induced regulation on adsorption. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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