Lee Heehyeon, Oh Jongwon, Koo Jin Young, Ohtsu Hiroyoshi, Jin Hyeong Min, Kim Soyoung, Lee Jae-Seung, Kim Hyunchul, Choi Hee Cheul, Oh Youngtak, Yoon Seok Min
Center for Sustainable Environment Research, Korea Institute of Science and Technology (KIST), Seoul02792, Republic of Korea.
Department of Materials Science and Engineering, Korea University, Seoul02841, Republic of Korea.
ACS Appl Mater Interfaces. 2022 Oct 19;14(41):46682-46694. doi: 10.1021/acsami.2c14453. Epub 2022 Oct 6.
Typical amorphous aerogels pose great potential for CO adsorbents with high surface areas and facile diffusion, but they lack well-defined porosity and specific selectivity, inhibiting utilization of their full functionality. To assign well-defined porous structures to aerogels, a hierarchical metal-organic aerogel (HMOA) is designed, which consists of well-defined micropores ( ∼ 1 nm) by coordinative integration with chromium(III) and organic ligands. Due to its hierarchical structure with intrinsically flexible coordination, the HMOA has excellent porous features of a high surface area and a reusable surface with appropriate binding energy for CO adsorption. The HMOA features high CO adsorption capacity, high CO/N IAST selectivity, and vacuum-induced surface regenerability (100% through 20 cycles). Further, the HMOA could be prepared via simple ambient drying methods while retaining the microporous network. This unique surface-tension-resistant micropore formation and flexible coordination systems of HMOA make it a potential candidate for a CO adsorbent with industrial scalability and reproducibility.
典型的无定形气凝胶作为具有高表面积和易于扩散的CO吸附剂具有巨大潜力，但它们缺乏明确的孔隙率和特定选择性，这限制了其全部功能的利用。为了给气凝胶赋予明确的多孔结构，设计了一种分级金属有机气凝胶（HMOA），它通过与铬（III）和有机配体的配位整合形成明确的微孔（约1nm）。由于其具有内在柔性配位的分级结构，HMOA具有高表面积和可重复使用表面的优异多孔特性，具有适合CO吸附的结合能。HMOA具有高CO吸附容量、高CO/N IAST选择性和真空诱导的表面再生能力（20个循环中100%）。此外，HMOA可以通过简单的常压干燥方法制备，同时保留微孔网络。HMOA这种独特的抗表面张力微孔形成和柔性配位系统使其成为具有工业可扩展性和可重复性的CO吸附剂的潜在候选材料。
