2023-10-03 ノースウェスタン大学
◆これは、炭素キャプチャの一部として、気候変動への対抗策として注目されています。従来のキャプチャ方法は高エネルギーコストがかかり、限定的であるため、新しい方法はより持続可能な解決策を提供する可能性があります。この研究は、炭素キャプチャ技術の進化に寄与し、環境からのCO2削減を可能にする新たなアプローチを示しています。
＜関連情報＞
- https://news.northwestern.edu/stories/2023/10/direct-carbon-capture-from-the-air/
- https://pubs.acs.org/doi/10.1021/acs.est.3c02543
水蒸気スイング炭素捕獲のためのイオンライブラリーの拡張 Expanding the Library of Ions for Moisture-Swing Carbon Capture
John Hegarty, Benjamin Shindel, Daria Sukhareva, Michael L. Barsoum, Omar K. Farha, and Vinayak Dravid
Environment Science and Technology Published:October 3, 2023
DOI:https://doi.org/10.1021/acs.est.3c02543
Abstract
Developing materials that can more efficiently and cheaply capture carbon dioxide from ambient atmospheric conditions is essential for improving negative emission technologies. This study builds on the promising moisture-swing modality for direct air capture of carbon dioxide by investigating the use of several new anions─orthosilicate, borate, pyrophosphate, tripolyphosphate, and dibasic phosphate─that when introduced into ion-exchange resins allow for the cyclable capture of CO2 under dry conditions and its release under wet conditions. These ions, as well as many others that failed to show moisture-swing performance, are tested and directly compared thermodynamically and kinetically to understand their differences. This includes the use of analytical approaches new to the carbon capture field, such as the correlation of adsorption isotherms to moisture-swing performance, the use of phase lag kinetics, the examination of the humidity-carbon capture hysteresis of the sorbents, and the precise quantification of ion loading using inductively coupled plasma–optical emission spectroscopy. Phosphate dibasic was found to have the largest mass-normalized CO2 moisture-swing capacity, whereas phosphate tribasic had the best performance when factoring in kinetics, and pyrophosphate had the highest swing capacity when normalizing on a per-ion or per-unit-charge basis. This work not only sheds light on ways to improve DAC but also provides insights pertinent to the advancement of gas separation, negative emission technologies, and sorbent materials.
