Direct air capture of co2 via aqueous-phase absorption and crystalline-phase release using concentrated solar power

ABSTRACT Using negative emissions technologies for the net removal of greenhouse gases from the atmosphere could provide a pathway to limit global temperature rises. Direct air capture of

carbon dioxide offers the prospect of permanently lowering the atmospheric CO2 concentration, providing that economical and energy-efficient technologies can be developed and deployed on a

large scale. Here, we report an approach to direct air capture, at the laboratory scale, using mostly off-the-shelf materials and equipment. First, CO2 absorption is achieved with readily

available and environmentally friendly aqueous amino acid solutions (glycine and sarcosine) using a household humidifier. The CO2-loaded solutions are then reacted with a simple guanidine

compound, which crystallizes as a very insoluble carbonate salt and regenerates the amino acid sorbent. Finally, effective CO2 release and near-quantitative regeneration of the guanidine

compound are achieved by relatively mild heating of the carbonate crystals using concentrated solar power. Access through your institution Buy or subscribe This is a preview of subscription

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FLOW Article Open access 13 February 2025 DISTRIBUTED DIRECT AIR CAPTURE OF CARBON DIOXIDE BY SYNERGISTIC WATER HARVESTING Article Open access 11 November 2024 UNDERSTANDING ENVIRONMENTAL

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Scholar  Download references ACKNOWLEDGEMENTS This research was supported by the US Department of Energy, Office of Science, Basic Energy Sciences, Chemical Sciences, Geosciences, and

Biosciences Division. AUTHOR INFORMATION Author notes * These authors contributed equally: Flavien M. Brethomé and Neil J. Williams. AUTHORS AND AFFILIATIONS * Chemical Sciences Division,

Oak Ridge National Laboratory, Oak Ridge, TN, USA Flavien M. Brethomé, Neil J. Williams, Charles A. Seipp, Michelle K. Kidder & Radu Custelcean Authors * Flavien M. Brethomé View author

publications You can also search for this author inPubMed Google Scholar * Neil J. Williams View author publications You can also search for this author inPubMed Google Scholar * Charles A.

Seipp View author publications You can also search for this author inPubMed Google Scholar * Michelle K. Kidder View author publications You can also search for this author inPubMed Google

Scholar * Radu Custelcean View author publications You can also search for this author inPubMed Google Scholar CONTRIBUTIONS F.M.B. performed and analysed the CO2 absorption and sorbent

regeneration experiments, and the potentiometric titration measurements. N.J.W. optimized and scaled up the synthesis of PyBIG, optimized the CO2 absorption and sorbent regeneration with

PyBIG, and performed the solubility measurements. C.A.S. designed and synthesized the PyBIG compound. M.K.K. performed and analysed the DSC and TGA measurements. R.C. led the project,

conceptualized the study, performed the measurements with concentrated solar power and wrote the manuscript. All authors contributed to discussions and manuscript reviews. CORRESPONDING

AUTHOR Correspondence to Radu Custelcean. ETHICS DECLARATIONS COMPETING INTERESTS A US patent application (no. 15/813,557), currently pending, has been filed, with R.C., C.A.S. and N.J.W. as

inventors, covering the DAC system described in this manuscript. ADDITIONAL INFORMATION PUBLISHER'S NOTE: Springer Nature remains neutral with regard to jurisdictional claims in

published maps and institutional affiliations. SUPPLEMENTARY INFORMATION SUPPLEMENTARY INFORMATION Supplementary Figures 1–12, Supplementary Tables 1–3 and Supplementary Methods RIGHTS AND

PERMISSIONS Reprints and permissions ABOUT THIS ARTICLE CITE THIS ARTICLE Brethomé, F.M., Williams, N.J., Seipp, C.A. _et al._ Direct air capture of CO2 via aqueous-phase absorption and

crystalline-phase release using concentrated solar power. _Nat Energy_ 3, 553–559 (2018). https://doi.org/10.1038/s41560-018-0150-z Download citation * Received: 29 September 2017 *

Accepted: 06 April 2018 * Published: 07 May 2018 * Issue Date: July 2018 * DOI: https://doi.org/10.1038/s41560-018-0150-z SHARE THIS ARTICLE Anyone you share the following link with will be

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