Metal-organic frameworks (MOFs) have been recognized as promising adsorbents for carbon capture due to their ultrahigh surface areas and tunable properties. However, a majority of MOFs have strict requirements for preparation and high mass transfer resistance that limits the gas separation time. In order to improve the applicability of MOFs to practical applications, herein, we reported an experimental approach to prepare structured CuBTC/graphene aerogel (GA) composites using ionic liquid (IL) additives (CuBTC/GA-IL) at room temperature for CO₂ capture. The material was characterized by powder X-ray diffraction (PXRD), scanning electron microscopy (SEM), specific surface area analysis, and CO₂ adsorption tests. It was demonstrated that CuBTC/GA-IL exhibited the higher CO₂ uptake than CuBTC/GA prepared without IL additives. Besides, the breakthrough experiments have shown that CuBTC/GA-IL exhibited the lower mass transfer resistance compared with CuBTC-IL and good cyclability. The effective approach of fabricating CuBTC into GA using IL additives to improve CO₂ adsorption in this study may be extensively applied for other MOF-based composites.

Graphical abstract

金属有机骨架（MOF）由于具有超高的表面积和可调节的特性，因此被认为是有前途的碳捕获吸附剂。但是，大多数MOF对制备有严格的要求，并且对传质的要求很高，这限制了气体分离时间。为了提高MOF在实际应用中的适用性，我们在本文中报道了一种实验方法，该方法在室温下使用离子液体（IL）添加剂（CuBTC / GA-IL）制备CO _2的结构化CuBTC /石墨烯气凝胶（GA）复合材料捕获。通过粉末X射线衍射（PXRD），扫描电子显微镜（SEM），比表面积分析和CO ₂吸附测试来表征该材料。结果表明，CuBTC / GA-IL的CO含量较高比不使用IL添加剂制备的CuBTC / GA吸收₂倍。此外，突破性实验表明，CuBTC / GA-IL与CuBTC-IL相比具有较低的传质阻力和良好的循环性。在这项研究中，使用IL添加剂将CuBTC制成GA的有效方法可改善CO _2的吸附，可广泛应用于其他基于MOF的复合材料。

图形概要