Goncalves Rebecca B, Collados Carlos Cuadrado, Malliakas Christos D, Wang Zhiwei, Thommes Matthias, Snurr Randall Q, Hupp Joseph T
Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States.
Institute of Separation Science and Technology, Department of Chemical and Bioengineering, Friedrich-Alexander-University Erlangen-Nürnberg, Erlangen 91058, Germany.
Langmuir. 2024 Apr 30;40(17):9299-9309. doi: 10.1021/acs.langmuir.4c00885. Epub 2024 Apr 22.
Industrialization over the past two centuries has resulted in a continuous rise in global CO emissions. These emissions are changing ecosystems and livelihoods. Therefore, methods are needed to capture these emissions from point sources and possibly from our atmosphere. Though the amount of CO is rising, it is challenging to capture directly from air because its concentration in air is extremely low, 0.04%. In this study, amines installed inside metal-organic frameworks (MOFs) are investigated for the adsorption of CO, including at low concentrations. The amines used are polyamidoamine dendrimers that contain many primary amines. Chemically reversible adsorption of CO via carbamate formation was observed, as was enhanced uptake of carbon dioxide, likely via dendrimer-amide-based physisorption. Limiting factors in this initial study are comparatively low dendrimer loadings and slow kinetics for carbon dioxide uptake and release, even at 80 °C.
在过去两个世纪里，工业化导致全球二氧化碳排放量持续上升。这些排放正在改变生态系统和生计。因此，需要一些方法来从点源以及可能从大气中捕获这些排放物。尽管二氧化碳的排放量在增加，但直接从空气中捕获具有挑战性，因为其在空气中的浓度极低，仅为0.04%。在本研究中，对安装在金属有机框架（MOF）内的胺类用于吸附二氧化碳进行了研究，包括低浓度二氧化碳的吸附。所使用的胺类是含有许多伯胺的聚酰胺胺树枝状大分子。观察到通过氨基甲酸盐形成实现了二氧化碳的化学可逆吸附，以及可能通过基于树枝状大分子 - 酰胺的物理吸附增强了二氧化碳的吸收。在这项初步研究中的限制因素是树枝状大分子的负载量相对较低，以及即使在80°C时二氧化碳吸收和释放的动力学也较慢。
