荷電分子層を利用したCO2の空気中直接回収の改良(Research shows improved direct air capture of CO2 using charged molecule layers)

2024-08-13

2024-08-12 オークリッジ国立研究所(ORNL)

オークリッジ国立研究所の研究者たちは、表面に小さな分子修正を加えることで、二酸化炭素の直接空気回収（DAC）技術の吸収性能を向上させることに成功しました。アミノ酸はCO2と反応しやすく、環境に優しいものの、自然には表面に引き寄せられません。研究チームは、アミノ酸溶液に帯電したポリマー層を追加し、その結果、表面に保持されたアミノ酸がCO2捕捉を15％加速することを確認しました。現在、研究者たちはエネルギー効率の高い再生方法を模索しています。

＜関連情報＞

空気と水の界面における荷電オリゴマーとアミノ酸の相乗的会合：表面指向型CO2回収への道 Synergistic Assembly of Charged Oligomers and Amino Acids at the Air–Water Interface: An Avenue toward Surface-Directed CO2 Capture

Uvinduni I. Premadasa,Nitesh Kumar,Zewen Zhu,Diana Stamberga,Tianyu Li,Santanu Roy,Jan-Michael Y. Carrillo,Jeffrey D. Einkauf,Radu Custelcean,Ying-Zhong Ma,Vera Bocharova,Vyacheslav S. Bryantsev,Benjamin Dought
ACS Applied Materials & Interfaces Published: February 27, 2024
DOI:https://doi.org/10.1021/acsami.3c18225

Abstract

Interfaces are considered a major bottleneck in the capture of CO₂ from air. Efforts to design surfaces to enhance CO₂ capture probabilities are challenging due to the remarkably poor understanding of chemistry and self-assembly taking place at these interfaces. Here, we leverage surface-specific vibrational spectroscopy, Langmuir trough techniques, and simulations to mechanistically elucidate how cationic oligomers can drive surface localization of amino acids (AAs) that serve as CO₂ capture agents speeding up the apparent rate of absorption. We demonstrate how tuning these interfaces provides a means to facilitate CO₂ capture chemistry to occur at the interface, while lowering surface tension and improving transport/reaction probabilities. We show that in the presence of interfacial AA-rich aggregates, one can improve capture probabilities vs that of a bare interface, which holds promise in addressing climate change through the removal of CO₂ via tailored interfaces and associated chemistries.