Choe, Jong Hyeak Kim, Hyojin Shin, Dong Yun Kim, Namju Cheon, Gayoung Yun, Hongryeol Youn, Jeongwon Lee, Jung-Hoon Hong, Chang Seop 2025-12-19T07:30:20Z 2025-12-19T07:30:20Z 2025-12-19 2025-12 1385-8947 https://pubs.kist.re.kr/handle/201004/153814 Although diamine-appended Mg2(dobpdc) (dobpdc4− = 4,4′-dioxidobiphenyl-3,3′-dicarboxylate) exhibits excellent CO2 capture performance, its reusability under humid conditions is severely limited due to the loss of diamine groups caused by water vapor. This degradation becomes more pronounced at higher humidity levels. To address this issue, we coated Mg2(dobpdc) with poly(divinylbenzene) (PDVB) via postsynthetic in-situ polymerization, producing MOF/PDVB–X (X = 1, 3, 5) composites. Transmission electron microscopy confirmed that MOF/PDVB–3 and MOF/PDVB–5 possessed a hydrophobic PDVB layer on the MOF surface. Subsequent functionalization with N-ethylethylenediamine (een) afforded een–MOF/PDVB composites. Notably, een–MOF/PDVB–5 displayed outstanding stability, maintaining high CO2 adsorption capacity during prolonged ambient air exposure, as well as in repeated humid CO2 adsorption–desorption and humid breakthrough cycles, even at a significantly high relative humidity of 90 %. These findings demonstrate that PDVB coating offers a simple yet effective strategy to produce water-resistant, amine-functionalized adsorbents with excellent CO2 capture performance and long-term durability for practical applications. English Elsevier BV Postsynthetic in situ polymerization of a diamine-appended MOF for humidity-tolerant CO2 capture Article 10.1016/j.cej.2025.170939 1 Chemical Engineering Journal, v.526 Chemical Engineering Journal 526 N scie scopus 001625431700007 2-s2.0-105022138771 Engineering, Environmental Engineering, Chemical Engineering Article METAL-ORGANIC FRAMEWORK CARBON-DIOXIDE CAPTURE FLUE-GAS ADSORPTION VARIANTS AIR Metal-organic frameworks CO2 adsorption Long-term stability Hydrophobicity Postsynthetic modification