In this paper, novel M−Mg/DOBDC (M = Li, Na, K) composites (a MOF built of Mg(OAc)₂·4H₂O and MOAc (M = Li, Na, K) linked by 2,5-dioxido-1,4-benzenedicarboxylate (DOBDC) ligands) were prepared for the first time by doping alkali metals in Mg/DOBDC MOF. The CO₂ dynamic adsorption performance of the novel synthesized composite was experimentally investigated, including different alkali metal doping amounts and alkali metal species. The structural morphology and CO₂ adsorption of the composites were characterized by XRD, FT-IR, SEM, EDX, BET, CO₂-TPD and TGA. Ten cycles of adsorption–desorption tests were performed on the M−Mg/DOBDC after doping with alkali metals. In addition, the CO₂ adsorption process of the materials was simulated using various models. The results showed that the introduction of the alkali cation M⁺ would coordinate with the active site of the metal center and had high affinity and activation ability for CO₂. The composite with the best dynamic CO₂ uptake after the modification of Li, Na and K alkali metals was 0.5 K-Mg/DOBDC with an adsorption capacity of 14.93 mmol g⁻¹ (0.1 MPa, 25 °C), which was 3.44 times higher than that of the parent material Mg/DOBDC. That was higher than the previously reported CO₂ capture performance.

在本文中，新型 M−Mg/DOBDC (M = Li, Na, K) 复合材料（由 Mg(OAc) ₂ ·4H ₂ O 和 MOAc (M = Li, Na, K) 通过 2,5 连接构成的 MOF）首次通过在 Mg/DOBDC MOF 中掺杂碱金属制备了 1,4-二氧化苯二甲酸 (DOBDC) 配体。对新型合成复合材料的CO _{2动态吸附性能进行了实验研究，包括不同碱金属掺杂量和碱金属种类。}采用XRD、FT-IR、SEM、EDX、BET、CO ₂ -TPD和TGA对复合材料的结构形貌和CO ₂吸附性能进行了表征。掺杂碱金属后，对 M−Mg/DOBDC 进行了 10 个循环的吸附-解吸测试。此外，利用各种模型模拟了材料的CO _{2吸附过程。}^{结果表明，碱金属阳离子M +}的引入与金属中心活性位点配位，对CO ₂具有较高的亲和力和活化能力。_{Li、Na、K碱金属修饰后动态吸收CO 2}效果最好的复合材料为0.5 K-Mg/DOBDC，吸附容量为14.93 mmol g −1 ⁽ 0.1 MPa, 25 ℃)，是吸附容量的3.44倍。高于母材 Mg/DOBDC。这高于之前报道的CO ₂捕获性能。