Controllable Construction of Amino-Functionalized Dynamic Covalent Porous Polymers for High-Efficiency CO 2 Capture from Flue Gas.

The design of high-efficiency CO adsorbents with low cost, high capacity, and easy desorption is of high significance for reducing carbon emissions, which yet remains a great challenge. This work proposes a facile construction strategy of amino-functional dynamic covalent materials for effective CO capture from flue gas. Upon the dynamic imine assembly of N-site rich motif and aldehyde-based spacers, nanospheres and hollow nanotubes with spongy pores were constructed spontaneously at room temperature. A commercial amino-functional molecule tetraethylenepentamine could be facilely introduced into the dynamic covalent materials by virtue of the dynamic nature of imine assembly, thus inducing a high CO capacity (1.27 mmol·g) from simulated flue gas at 75 °C. This dynamic imine assembly strategy endowed the dynamic covalent materials with facile preparation, low cost, excellent CO capacity, and outstanding cyclic stability, providing a mild and controllable approach for the development of competitive CO adsorbents.