期刊
CHEMICAL ENGINEERING JOURNAL
卷 349, 期 -, 页码 92-100出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2018.05.072
关键词
N-doped ultra-microporous carbon; High pyrrolic N content; Fast mechanochemistry; High CO2 adsorption selectivity
资金
- National Natural Science Foundation of China [21676059, 21666004]
- Natural Science Foundation of Guangxi Zhuang Autonomous Region [2017GXNSFFA198009, 2016JJA120072]
A pyrrolic N-enriched microporous carbon composite was synthesized using mechanochemical strategy via copolymerized melamine/dopamine (PDA/MA) within ultra-short reaction time (30 min) for CO2 capture from gaseous mixture of CO2/N-2. Dopamine doping efficiently restrained the sublimation of melamine during calcination, which leaded to higher yield (> 70 wt%) in comparison with pure C3N4. The synthesized carbon composite possessed ultra-microporous structure (5.3-5.6 angstrom) and abundant (pyrrolic N of 13.1 wt%) CO2-philic sites. Results showed that PDA(0.3)/MA(0.7)-2 exhibited high CO2 capacity of 16.0 wt% (3.64 mmol/g) at 298 K and 20.3 wt% (4.6 mmol/g) at 273 K and 1.0 bar pressure. The isosteric heat of adsorption (Q(st)) was 37.4 kJ/mol, indicating a strong interaction of the composite with CO2 molecules. Ideal adsorption solution theory demonstrated that PDA(0.)(3)/MA(0.)(7)-2 possessed a super high CO2 selectivity (108) in CO2/N-2 (10:90) mixture at 273 K. High CO2 capacity and selectivity, green and fast fabrication strategy and cost effective raw materials make the proposed novel PDA/MA carbons as promising candidates for CO2 capture from post-combustion flue gases.
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