Dods Matthew N, Weston Simon C, Long Jeffrey R
Departments of Chemistry and Chemical and Biomolecular Engineering, University of California, Berkeley, Berkeley, CA, 94720, USA.
ExxonMobil Technology and Engineering Company, Annandale, NJ, 08801, USA.
Adv Mater. 2022 Sep;34(38):e2204277. doi: 10.1002/adma.202204277. Epub 2022 Aug 18.
Mitigation of anthropogenic climate change is expected to require large-scale deployment of carbon dioxide removal strategies. Prominent among these strategies is direct air capture with sequestration (DACS), which encompasses the removal and long-term storage of atmospheric CO by purely engineered means. Because it does not require arable land or copious amounts of freshwater, DACS is already attractive in the context of sustainable development, but opportunities to improve its sustainability still exist. Leveraging differences in the chemistry of CO and water adsorption within porous solids, here, the prospect of simultaneously removing water alongside CO in direct air capture operations is investigated. In many cases, the co-adsorbed water can be desorbed separately from chemisorbed CO molecules, enabling efficient harvesting of water from air. Depending upon the material employed and process conditions, the desorbed water can be of sufficiently high purity for industrial, agricultural, or potable use and can thus improve regional water security. Additionally, the recovered water can offset a portion of the costs associated with DACS. In this Perspective, molecular- and process-level insights are combined to identify routes toward realizing this nascent yet enticing concept.
减轻人为气候变化预计需要大规模部署二氧化碳去除策略。其中突出的策略是碳捕获与封存（DACS），它包括通过纯工程手段去除和长期储存大气中的二氧化碳。由于它不需要耕地或大量淡水，DACS在可持续发展背景下已经具有吸引力，但仍有机会提高其可持续性。利用多孔固体中二氧化碳和水吸附化学的差异，本文研究了在直接空气捕获操作中同时去除水和二氧化碳的前景。在许多情况下，共吸附的水可以与化学吸附的二氧化碳分子分开解吸，从而实现从空气中高效收集水。根据所使用的材料和工艺条件，解吸的水可以具有足够高的纯度用于工业、农业或饮用水用途，从而改善区域水安全。此外，回收的水可以抵消与DACS相关的部分成本。在这篇综述中，结合分子和过程层面的见解，以确定实现这一新兴但诱人概念的途径。
