2026-10-13T01:50:45Z https://www.scidb.cn/oai

10.57760/sciencedb.45537 2026-08-17T11:21:23Z

2026-08-17 Dual-site engineering in EDTA-modified Mg-MOF-74 for effective CO2 capture under humid conditions doi:10.57760/sciencedb.45537 en Mg-MOF-74 ([Mg2(DOBDC)]) represents a high-performance solid adsorbent for carbon capture, however, its CO2 uptake decreases significantly under humid flue gas conditions due to competitive adsorption between H2O and CO2 molecules. Herein, a mixed-linker modification strategy is employed by integrating ethylenediaminetetraacetic acid (EDTA) into the Mg-MOF-74 framework. This approach preserves the original onedimensional pore structure while altering the coordination environment of Mg2+ sites, reducing their coordination number to five. The resulting structure with uncoordinated oxygen atoms from EDTA serves as exclusive adsorption centers for H2O thereby protecting the CO2 adsorption capacity. The optimized MOFs exhibits a high CO2 adsorption capacity (6.4 mmol/g, at 1 bar) and outstanding CO2/N2 selectivity (346). In humid CO2/N2 (15:85, v:v, at 314 K, RH% = 86%) breakthrough experiment, the EDTA-modified frameworks maintain stable CO2 uptake (3.92 mmol/g), consistent with dry performance, whereas the pristine Mg-MOF-74 shows a great reduction (2 mmol/g). In-situ FTIR further reveals that the incorporation of EDTA facilitates the formation of hydrogen bonding and carbonate species, synergistically enhancing the moisture resistance of MOF materials. Moreover, the modified material retains stable breakthrough times over six consecutive adsorption-desorptioncycles under high-humidity conditions, demonstrating its great potential for scalable industrial carbon capture applications. CO2 capture; EDTA; Dual-site engineering; Metal–organic framework; Humid condition Chaoying Zhang Qian Jia Guoqiang Li Feng Li Haitao Cui Congming Li Lei Li PUBLIC https://creativecommons.org/licenses/by-nc-nd/4.0/ dataset Science Data Bank