Li Liangli, Zhou Zaiyang, Yang Yadong, Liu Tingting, Wan Caichao
College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, PR China.
College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, PR China.
Int J Biol Macromol. 2025 Apr;303:140423. doi: 10.1016/j.ijbiomac.2025.140423. Epub 2025 Jan 28.
Microporous metal-organic frameworks (MOF) exhibit excellent carbon dioxide (CO) adsorption performance and selectivity for CO/N separation. However, the challenges associate with the recycling and reuse of MOF powders hinder their practical applications. To address these limitations, a flexible and stable MOF-based composite material was designed by immobilizing UiO-66(Zr)-(OH) onto cellulose nanofibers (CNFs) aerogels (MOF-CNFs), which featured high porosity. Experimental results showed that MOF-CNFs exhibited sensitivity to CO adsorption at low pressure and achieved a CO adsorption capacity of 1.8 mmol/g at 0.15 bar under the 298 K. This represented an 8.8 % improvement compared to the MOF. Ideal adsorbed solution theory (IAST) calculations indicated selectivity for CO/N mixtures (molar ratio 15:85) as high as 66. After eight adsorption-desorption cycles, the CO adsorption capacity retained 97 % of its initial value. These results highlighted the significant potential of MOF-CNFs as reusable and highly efficient CO separation adsorbents for practical applications, such as flue gas capture.
微孔金属有机框架材料（MOF）展现出优异的二氧化碳（CO₂）吸附性能以及对CO₂/N₂分离的选择性。然而，与MOF粉末的回收再利用相关的挑战阻碍了它们的实际应用。为解决这些限制，通过将UiO-66(Zr)-(OH)固定在具有高孔隙率的纤维素纳米纤维（CNF）气凝胶上（MOF-CNFs），设计了一种灵活且稳定的基于MOF的复合材料。实验结果表明，MOF-CNFs在低压下对CO₂吸附表现出敏感性，在298K、0.15巴的条件下实现了1.8 mmol/g的CO₂吸附容量。与MOF相比，这提高了8.8%。理想吸附溶液理论（IAST）计算表明，对于CO₂/N₂混合物（摩尔比15:85）的选择性高达66。经过八次吸附-解吸循环后，CO₂吸附容量保留了其初始值的97%。这些结果突出了MOF-CNFs作为可重复使用且高效的CO₂分离吸附剂在实际应用（如烟气捕获）中的巨大潜力。
