Articles & Issues
- Language
- English
- Conflict of Interest
- In relation to this article, we declare that there is no conflict of interest.
- Publication history
-
Received December 12, 2023
Accepted May 28, 2024
- 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 unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
All issues
Bio-base Metal Organic Frameworks as Potential CO 2 Adsorbents
Abstract
Environmental friendliness and high adsorption capacity are important properties of CO 2 adsorbents. Bio-based metal–
organic framework (bioMOFs) materials off er notable benefi ts for CO 2 capture. Amino acids like L -glutamic acid (Glu)
and L-aspartate (Asp) are employed as ligands for the synthesis of bioMOFs, Asp-Cu and Glu-Cu. Characterization results
confi rmed that Asp-Cu and Glu-Cu possessed tertiary amine and secondary amine structures, respectively. The adsorption
capacities of Glu-Cu and Asp-Cu were up to 253 mg·g −1 and 277 mg·g −1 at 1 bar CO 2 pressure and 190 mg·g −1 and
223 mg·g −1 at 0.15 bar CO 2 pressure. The CO 2 adsorption properties of bioMOFs were comprehensively evaluated under
various conditions, including temperature, water content, SO 2 concentration, and other compositions. Adsorption data were
fi tted well with the pseudo-fi rst-order kinetics and Weber-Morris intraparticle diff usion model. The kinetic studies revealed
that a small amount of water signifi cantly accelerated the pseudo-fi rst-order kinetic constants, whereas excess water vapor
greatly hindered the intra-diff usion constants of CO 2 . The presence of SO 2 led to a decrease in the adsorption capacity of both
MOFs due to rapid reactions occurring with active sites on the MOF surface. Furthermore, these bioMOFs were easily recovered
and regenerated for at least 20 cycles. The primary CO 2 adsorption mechanism involved catalytic hydration reactions
on Asp-Cu, while chemical adsorption occurred on Glu-Cu. Both mechanisms were accompanied by physical adsorption.