Amino Acid-Functionalized Nanoporous Metal–Organic Frameworks for Boosting CO₂ Capture under Dry and Humid Conditions

Metal–organic frameworks (MOFs), a class of porous materials, featuring high surface areas, chemical tunability and stability, have been extensively studied for their applications in gas adsorption and separation, particularly in carbon dioxide (CO2) capture. However, their CO2 capture capacities often decrease under humid conditions and cannot meet practical application requirements. Herein, we present a facile postsynthetic method to incorporate amino acids (AAs) into an ultrastable MIP-206-OH MOF to construct a series of MIP-206-OH-AA materials. Among these materials, MIP-206-OH-Gly exhibited superior CO2 capture performance, achieving capacities of 48.4 cm3 g–1 (1 bar, 273 K) and 317 cm3 g–1 (30 bar, 273 K), which showed 92.8 and 71.9% enhancement compared to the pristine MIP-206-OH materials, respectively. Furthermore, MIP-206-OH-Gly and MIP-206-OH-Ala exhibited enhanced CO2 capture performance under humid conditions and exhibited exceptional stability, maintaining their performance even after 10 cycles. This study provides a facile method to construct amino acid-functionalized nanoporous MOFs for boosting CO2 capture and underscores the potential of this strategy as an effective and scalable solution for carbon capture under dry and humid conditions.