Two-Dimensional Covalent Organic Frameworks for Carbon Dioxide Capture through Channel-Wall Functionalization

• Published in: Angewandte Chemie International Edition 2015-03, Vol.54 (10), p.2986-2990
• Main Authors: Huang, Ning, Chen, Xiong, Krishna, Rajamani, Jiang, Donglin
• Format: Article
• Language: English
• Subjects: Carbon capture and storage; Carbon dioxide; Channels; Communications; Covalence; covalent organic frameworks; flue gas separation; gas adsorption; Separation; Strategy; synthesis; Two dimensional; Walls
• ISSN: 1433-7851; 1521-3773
• DOI: 10.1002/anie.201411262

Ordered open channels found in two‐dimensional covalent organic frameworks (2D COFs) could enable them to adsorb carbon dioxide. However, the frameworks’ dense layer architecture results in low porosity that has thus far restricted their potential for carbon dioxide adsorption. Here we report a strategy for converting a conventional 2D COF into an outstanding platform for carbon dioxide capture through channel‐wall functionalization. The dense layer structure enables the dense integration of functional groups on the channel walls, creating a new version of COFs with high capacity, reusability, selectivity, and separation productivity for flue gas. These results suggest that channel‐wall functional engineering could be a facile and powerful strategy to develop 2D COFs for high‐performance gas storage and separation. Efficient CO2 capture is achieved by converting a conventional two‐dimensional covalent organic framework (COF) to an outstanding CO2 capture material with large capacity and high selectively. The nanopore walls are chemically engineered with functional groups in a controlled manner to enhance interactions with CO2, leading to the development of a new general way to design COFs for gas storage and separation.