选择性
吸附
兴奋剂
化学
金属
无机化学
金属有机骨架
化学工程
材料科学
有机化学
催化作用
光电子学
工程类
作者
Asmat Ullah Khan,Ojo Samuel,Mohd Hafiz Dzarfan Othman,Mohammad Younas,Roziana Kamaludin,Mohd Hafiz Puteh,Tonni Agustiono Kurniawan,Keng Yinn Wong,Farahdila Kadirkhan,Naoko Yoshida
标识
DOI:10.1016/j.seppur.2024.127511
摘要
The fine-tuning of metal–organic frameworks (MOFs) can enable the development of effective adsorbents for the selective capture of less polarizable carbon dioxide (CO2) from flue gases. In this work, a series of bi-metallic MOFs with different Mg metal concentrations (1–10 mol%) were synthesized by in situ metal substitution followed by post-synthetic functionalization with 10–50 wt% of polyethyleneimine (PEI). Detailed characterization confirmed the successful incorporation of the secondary metal and amine group into the MOF framework. Results showed that only up to 2 mol% of copper (Cu) can be substituted by Mg metal in the framework of MOF-199; further increase in Mg content disrupts the electrostatic equilibrium, leading to the formation of carbon matter-based copper nanoparticles instead. The sorption results indicated that 2 mol% Mg-doped MOF (MOF@Mg2) demonstrate a CO2 uptake of 8.61 (mmol/g) at 1 bar and 273.15 K. This reflects a 17.78 % increase in CO2 absorption capacity compared to the pristine MOF. Furthermore, 40 wt% PEI-loaded MOF exhibited a 37.90 % enhancement in CO2 adsorption selectivity. This study explores in detail the intricate process of optimizing the metal ratio and PEI loading in the bimetallic MOF-199(Cu, Mg), aiming to improve its CO2 adsorption efficiency.
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