Amino-Functionalized Porphyrin-Based Porous Organic Polymers for CO<sub>2</sub> Capture and Hg<sup>2+</sup> Removal
Guo Jiangfei, Wang Lizhi, Du Zhang, Jianhan Huang
Abstract
Functionalized porous organic polymers (POPs) with high Brunauer–Emmett–Teller (BET) surface area (SBET) and unique porosity are promising for CO2 capture and Hg2+ removal, although their facile synthesis remains a challenge. Herein, a kind of novel amino-functionalized porphyrin-based POPs was developed based on the Friedel–Craft acylation reaction and Schiff-base reaction, and melamine was adopted as both the rigid cross-linking bridges and the amino-functionalized agent for the construction of the polymers. The resultant polymers exhibited high SBET (587 m2/g) and pore volume (0.46 cm3/g) with abundant amino, imine, and triazine functionalities (42.08 wt %). The CO2 uptake reached 172 mg/g at 273 K and 1.0 bar and the maximum Hg2+ capacity reached 328.1 mg/g. In particular, the characteristic hierarchical micro/mesoporosity of the polymers was beneficial for the kinetic adsorption due to the fast diffusion of Hg2+ in the pore channels. This study offers a facile postfunctionalization strategy to fabricate the functionalized POPs with high surface area and unique hierarchical porosity.