Reducing the anthropogenic emission of CO 2 is currently a top priority due to its global warming effect. Capturing CO 2 by porous materials is a promising approach due to its energetic efficiency and technical feasibility. A promising adsorbent for capturing CO 2 should possess not only large BET specific surface areas (SSAs) but also high heat of adsorption. Since the intrinsic quadrupole moment of the CO 2 molecule exists, introduction of a polar functional group in the framework of porous materials could enhance CO 2 uptake. In this work, we adopt the postsynthetic modification approach to synthesize UMCM-1-NH 2 -MA (MA = maleic anhydride) material on the basis of UMCM-1-NH 2 with an extremely high BET SSA of 4064 m 2 g −1 and further explore the effects of free acid functionalities and aromatic amino groups on CO 2 capture. The experimental and theoretical results show that, besides amino groups, the polar acidic functionalities also exhibit excellent capability for CO 2 capture. Moreover, our firstprinciples calculations indicate that the aromatic imino group loses affinity toward CO 2 significantly, compared with the aromatic amino group. In short, we believe that incorporating polar acidic functionalities into the porous materials could be an alternatively suitable approach for enhancing CO 2 capture.
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