Abstract
Amine-functionalized metal-organic frameworks (MOFs) are a promising strategy for the high-efficiency capture and separation of CO2. In this work, by tuning the ratio of 1,3,5-benzenetricarboxylic acid (H3BTC) to 5-aminoisophthalic acid (5-NH2-H2IPA), we designed and synthesized a series of amine-functionalized highly stable Ti-based MOFs (named MIP-207-NH2-n, in which n represents 15%, 25%, 50%, 60%, and 100%). The structural analysis shows that the original framework of MIP-207 in the MIP-207-NH2-n (n = 15%, 25%, and 50%) MOFs remains intact when the mole ratio of ligand H3BTC to 5-NH2-H2IPA is less than 1 to 1 in the resulting MOFs. By the introduction of amino groups, MIP-207-NH2-25% demonstrates outstanding CO2 capture performance up to 3.96 and 2.91 mmol g−1, 20.7% and 43.3% higher than those of unmodified MIP-207 at 0 and 25 °C, respectively. Furthermore, the breakthrough experiment indicates that the dynamic CO2 adsorption capacity and CO2/N2 separation factors of MIP-207-NH2-25% are increased by about 25% and 15%, respectively. This work provides an additional strategy to construct amine-functionalized MOFs with the maintenance of the original MOF structure and high performance of CO2 capture and separation.
Highlights
The amine-modified highly stable MIP-207 with different -NH2 content was successfully prepared by the mixed linkers method
The CO2 adsorption and breakthrough experiments show that MIP-207-NH225% demonstrates the superior CO2 capture and separation performance
The highly efficient CO2 uptake is attributed to the introduction of -NH2 into the framework of MIP-207, 4
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Metal-organic frameworks (MOFs) have been widely used for various applications owing to their ordered crystallinity, high specific surface area, and versatile tunability of chemical environments [9,10,11,12,13,14,15,16,17] They can serve as attractive platforms for CO2 adsorption and separation to mitigate the greenhouse effect [18,19,20,21,22,23,24,25]. It is widely acknowledged that amine-functionalized MOFs are one of the most effective ways to capture CO2 , because this method has the advantages of a large working CO2 capacity as well as a high CO2 selectivity and a low energy penalty for regeneration [7,26]. Concern.,we wefor forthe thefirst firsttime timeprepared preparedaaseries series of amine-functionalized highly stable
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