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Highlights • A series of melamine-based porous polyamides were facilely prepared by one-pot synthesis without catalyst. •These polyamides with abundant nitrogen content had much higher surface areas compared to previous polyamides. •Their porosity and nitrogen content were carefully controlled via a simple and effective approach. •The well-defined microporosity and abundant nitrogen give them outstanding CO2 capture. •The CO2 adsorption was highly dependent on the Vmicro/Vtotal. AbstractPorous organic polymers (POPs) with high Brunauer-Emmett-Teller (BET) surface area (SBET) and plentiful heteroatoms are promising for CO2 capture and separation. Herein a series of melamine-based porous polyamides were synthesized from melamine and binary/ternary benzoic acid by one-pot polycondensation strategy. These polymers have considerably high SBET (up to 521?m2/g) and enriched nitrogen (13.8–44.9?wt%). Importantly, they possess noteworthy CO2 uptake (0.53–2.9?mmol/g at 273?K and 1?bar), the synergistic effect of predominant microporosity and abundant nitrogen are beneficial. Moreover, they have moderate isosteric heats (Qst) (29.5–43.7?kJ/mol) and acceptable CO2/N2 selectivity (IAST: 31.6–277.8), which are highly relevant to the micropore volume, micropore area, and nitrogen content. |
Pub date: 01/09/2019 Source: Science Direct |