Benzoguanamine based polyaminal carbon materials for CO2 capture application

초록

In this work, the porous carbon materials are prepared by carbonizing benzoguanamine based polyaminal with and without KOH at 700 degrees C in N 2 atmosphere. The functional group and crystalline nature of the prepared materials are characterized using FT-IR and powder-XRD analysis. The carbonized polyaminals polymer contains various types of nitrogen moieties such as pyridinic-N, pyrrolic-N and quaternary amine-N are established by XPS spectra. The porous carbon material (P-BA-7b) prepared by activating polyaminal polymer with KOH shows the high surface area (639.48 m 2 g - 1 ) and total pore volume with microporous by N 2 sorption profiles. The KOH activated carbonized material is exhibited a significant CO 2 uptake capacity (2.84 mmol g - 1 at 273 K) and selectivity (39.6 at 273 K) over N 2 . The thermodynamic data of the materials demonstrate the spontaneity of the CO 2 adsorption process. The enthalpy (- Delta H 0 ) and heat of adsorption (-Q st ) results suggest both chemical and physical interactions of the CO 2 molecule and adsorbent, but the physisorption is more dominated. Hence, carbonized materials (nitrogen-containing) with good surface area and CO 2 capture with selectivity are promising candidates for CO 2 capture application

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