Nitrogen-rich polyaminal porous network for CO2 uptake studies and preparation of carbonized materials

• Published in: European polymer journal 2020-02, Vol.124, p.109477, Article 109477
• Main Authors: Senthilkumaran, Marimuthu, Saravanan, Chokalingam, Sethuraman, Venkatesan, Puthiaraj, Pillaiyar, Muthu Mareeswaran, Paulpandian
• Format: Article
• Language: English
• Subjects: Adsorption; Carbon dioxide; Condensation polymerization; Melamine; Micropores; Polyaminals; Polymers; Porous materials; Porous organic polymer; Selectivity; Surface area; Surface chemistry; Thermodynamics
• ISSN: 0014-3057; 1873-1945
• DOI: 10.1016/j.eurpolymj.2020.109477

[Display omitted] •Melamine based polyaminals are synthesized by a single step polycondensation reaction without catalyst.•Porous carbon materials are prepared by with/ without KOH at 700 °C.•Micro-porosity of the carbon material is enhanced by KOH.•Polyaminals show considerable CO2 uptake and selectivity (CO2/N2). The porous organic polymers (POPs) and its carbonized materials are having excellent textural properties with promising applications towards gas adsorption. The melamine based porous organic polymer is synthesized by one-pot condensation reaction and the porous carbon materials are prepared by carbonization with/without activator at 700 °C. The porous structure of the materials is confirmed by SEM and HR-TEM analysis. The prepared porous polymer is used to study the gas (CO2, CH4, N2) uptake application. The polymer exhibits considerable CO2 uptake and good selectivity. The monolayer adsorption of CO2 and heterogeneous surface of the polymer are studied by the Langmuir and Freundlich isotherms. Thermodynamic parameters (ΔG0, ΔH0 and ΔS0) of the adsorption process confirm the spontaneity, physisorption nature and randomness of the process. Qst values also confirm physisorption process. The porous carbonized materials have a high surface area, microporous surface area and total pore volume.