Moisture-Driven CO2 Sorbents
Moisture-Driven CO2 Sorbents
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DOI：
10.1016/j.joule.2020.07.005
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发表时间：
2020-08
期刊：
影响因子：
39.8
通讯作者：
Xiaoyang Shi;Hang Xiao;Kohei Kanamori;A. Yonezu;K. Lackner;Xi Chen
中科院分区：
文献类型：
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作者：
Xiaoyang Shi;Hang Xiao;Kohei Kanamori;A. Yonezu;K. Lackner;Xi Chen
提出了一种含有离子交换或纳米多孔材料和碳酸盐离子的节能系统，该系统能够通过控制与吸附剂接触的水量（水分）从环境空气中捕获二氧化碳。当环境干燥时，该系统将二氧化碳从空气中吸附，而当环境潮湿时，该系统将二氧化碳解吸。利用量子力学模拟研究了这种co2吸附和解吸系统的设计，并通过实验进行了验证。其工作机理揭示为碳酸盐离子与水分子化学反应的自由能变化；随着材料中水分子数量的减少，自由能的变化也随之减少。研究了吸附剂的孔径、阳离子间距和表面疏水性对co2捕集效率的影响。这项研究揭示了优化有效的直接空气捕获系统的方法，因此有助于“负排放技术”的发展。
An energy-saving system containing ion-exchange or nanoporous materials and carbonate ions is proposed, which is capable of capturing CO2from ambient air simply by controlling the amount of water (moisture) in contact with the sorbent. The system binds CO2from the air when the surrounding is dry, whereas it desorbs CO2when it is wet. A design of such CO2sorption and desorption systems is investigated using quantum mechanics simulations and is verified by experiments. Its working mechanism is revealed as the free energy change of the chemical reaction of the carbonate ions and water molecules; the free energy change decreases when the number of water molecules in the materials decreases. The influence of pore size, spacing of cations, and surface hydrophobicity of the sorbents on CO2capture efficiency are elucidated. The study sheds light on ways to optimize an efficient direct air capture system and therefore contributes to the development of "negative emission technologies."