Posted by The review focuses on multipronged approaches and multifarious research efforts which are underway to efficiently capture carbon dioxide (CO2) from emission sources, ambient air, and indoor air. Currently, absorption is the dominant industrial-scale process, using different solvents and their blends to lower the energy intensity of solvent desorption and regeneration. However, adsorption is emerging as a promising alternative due to its energy efficiency, eco-friendliness, and potential for large-scale applications. High-performance sorbents with large surface areas and bio-based materials exhibit high CO2 loading and selectivity in fixed-bed and fluidized-bed systems. Cryogenic CO2 capture systems, which do not require solvents or membranes, are optimized for energy through process integration. Researchers are investigating different membrane materials in hollow fiber membrane contactors for enhanced CO2 capture efficiency. Membranes that can selectively filter CO2 from gas mixtures are also being explored. Furthermore, hybrid technologies integrating different CO2 capture approaches are being developed to reduce costs and boost overall performance to curb rising atmospheric
CO2 levels.
The paper mentions an example using cyclodextrin: From a series of deep eutectic solvents (DESs), it was found that cyclodextrins and monoethanolamine (MEA)-based DES displayed high absorption capacity in temperatures ranging from 30 to 110 ◦C, a low regeneration temperature, and excellent cycling ability for CO2 capture due to the circular hydrogen bond formed with hydroxyl of MEA and cyclodextrins [2].
No examples are mentioned on CD-based adsorbents for CO2 capture therefore we propose another review which summarizes the literature on the capture and transformation of CO2 through macrocycle systems such as cyclodextrins including Cd derivatives and nanosponges [3]. Recently, CD-MOF was also studied as sorbent of CO2 [4,5].
References:
[1] Rathi, A. K. A. and Rathi, J. A. (2025) “CO2 capture: a concise, comprehensive overview of recent research trends,” Academia Environmental Sciences and Sustainability. Academia.edu Journals, 2(2). doi: 10.20935/AcadEnvSci7739.
[2] Yu J, Guan S, Zhang X, Chen Y, Liu X. (2024) Deep eutectic solvents based on cyclodextrin-monoethanolamine for high-efficiency carbon dioxide capture under high temperatures. J Environ Chem Eng.12:111625. doi: 10.1016/j.jece.2023.111625
[3] Sanabria, E., Maldonado, M., Matiz, C., Ribeiro, A. C. F., & Esteso, M. A. (2025). Methods of Capture and Transformation of Carbon Dioxide (CO2) with Macrocycles. Processes, 13(1), 117. https://doi.org/10.3390/pr13010117
[4] Chen, X., Zhang, Y., Sui, X. (2025) Eco-friendly one-pot hydrothermal synthesis of cyclodextrin metal-organic frameworks for enhanced CO2 capture. Carbohydrate Polymers 352, 123250.
https://doi.org/10.1016/j.carbpol.2025.123250
[5] Lopez, E. C. R., & Perez, J. V. D. (2023). CD-MOFs for CO2 Capture and Separation: Current Research and Future Outlook. Engineering Proceedings, 56(1), 65. https://doi.org/10.3390/ASEC2023-15374
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