浙江工业大学彭永武团队报道了二维亚化学计量COF上乙二胺共价接枝增强CO₂/N₂分离。相关研究成果于2024年12月17日发表在《中国化学》。

用于气体分离的二维亚化学计量共价有机框架（COFs）的合成后改性，特别是用于从CO₂/N₂混合物中有效去除CO₂，是一个越来越受关注的领域，但仍然相对未被探索。

该文中，研究人员报告了亚化学计量COF中官能团的精确调节，以提高二氧化碳捕获性能。设计并合成了一种具有游离醛基的亚化学计量COF（HPCOF），然后通过乙二胺（EDA）接枝进行共价改性，得到HPCOF-EDA。

这种后改性策略显著提高了CO₂吸附容量（在298 K和1 bar下为55.7 cm³·g^–1）和CO₂/N₂选择性（58），主要归因于额外N-H··O相互作用的形成。这些发现表明了功能工程在拓宽亚化学计量COFs，在气体吸附和分离技术中的应用前景方面的潜力。

附：英文原文

Title: Covalently Grafting of Ethylenediamine onto a 2D Sub-stoichiometric COF for Enhanced CO2/N2 Separation†

Author: Shixin Sun, Guanglun Luo, Yongwu Peng

Issue&Volume: 2024-12-17

Abstract: The post-synthetic modification of two-dimensional sub-stoichiometric covalent organic frameworks (COFs) for gas separation, particularly for the efficient removal of CO2 from CO2/N2 mixtures, is an area of growing interest yet remains relatively unexplored. In this study, we report the precise tuning of functional groups in sub-stoichiometric COFs to enhance CO2 capture performance. A sub-stoichiometric COF with free aldehyde groups (HPCOF) was designed and synthesized, followed by covalent modification via ethylenediamine (EDA) grafting, yielding HPCOF-EDA. This post-modification strategy significantly increased CO2 adsorption capacity (55.7 cm3·g–1 at 298 K and 1 bar) and CO2/N2 selectivity (58), primarily attributed to the formation of additional N—H···O interactions. These findings demonstrate the potential of functional engineering to broaden the application prospects of sub-stoichiometric COFs in gas adsorption and separation technologies.

DOI: 10.1002/cjoc.202401042

Source: https://onlinelibrary.wiley.com/doi/full/10.1002/cjoc.202401042