☆ 4.7 Article

Effective CO2 adsorption at low pressure over nitrogen-enriched porous carbons, derived from melamine-loaded polyaniline

CHEMICAL ENGINEERING JOURNAL (2021)

Journal

CHEMICAL ENGINEERING JOURNAL

Volume 412, Issue -, Pages -

Publisher

ELSEVIER SCIENCE SA

DOI: 10.1016/j.cej.2021.128641

Keywords

Adsorption; Carbon dioxide; Melamine; N-enriched carbon; Offgas; Polyaniline

Funding

Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT and future Planning [2017R1A2B2008774]
National Research Foundation of Korea [4120200213748] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)

Ask authors/readers for more resources

Protocol

Community support

Reagent

Community support

Automated Summary New
Abstract

Porous carbons derived from melamine/PANI mixture pyrolyzed at low temperatures showed better performance in CO2 adsorption, particularly MPC-550 at 550°C. The high N content and narrow pores of MPC-550 led to superior selectivity and adsorption capacity compared to PC-550.

Polyaniline (PANI)-derived carbon has been applied in various adsorptions because of the presence of nitrogen and relatively high porosity. In this study, melamine/PANI mixture was pyrolyzed at low temperatures (500?650 ?C) to derive porous carbons with high nitrogen content because of added melamine. Obtained carbons (Melamine/PANI-derived Carbons, MPCs) were characterized and applied in CO2 adsorption under low pressure, and MPC-550 (prepared at 550 ?C) showed much better performance than PC-550, derived from pure PANI, because of high N content (since N leads to polarity and basicity, which are helpful for CO2 adsorption) and narrow pores (even with low porosity). For example, MPC-550 and PC-550 (prepared at 550 ?C) had adsorption capacity of 1.2 and 1.0 mmol/g (at 0.15 atm); and isosteric heat of adsorption (IHA) at zero coverage of 46 and 32 kJ/mol, respectively. On the other hand, N2 adsorption relied mainly on porosity; therefore, MPC-550 had lower N2 adsorption than PC-550. Accordingly, MPC-550 and PC-550 showed ideal adsorbed solution theory selectivity (CO2/N2) of 75 and 61, respectively, under 1 atm. MPC-550 had competitive selectivity compared with other carbon-based adsorbents. MPC-500, prepared at 500 ?C, showed very high selectivity (110) and IHA (48 kJ/mol); however, had relatively low CO2 adsorption because of low porosity. Based on the advantages of MPC-550, compared with those of PC-550, adding nitrogenous compounds (like melamine) to PANI, before pyrolysis, is one of the recommendable methods for porous carbons, especially with high N content. Finally, MPC-550 was recyclable in CO2 adsorption and can be suggested as a promising adsorbent for CO2 capture from offgas.

Authors

I am an author on this paper

Click your name to claim this paper and add it to your profile.

Reviews

Primary Rating

4.7

Not enough ratings

Secondary Ratings

Novelty

Significance

Scientific rigor

Rate this paper

Melamine/polyaniline-derived carbons with record-high adsorption capacities for effective removal of phenolic compounds from water

Jong Min Park, Chang Min Kim, Sung Hwa Jhung

Summary: In this study, nitrogen-enriched porous carbon derived from a mixture of melamine and polyaniline was prepared and applied in the adsorption of phenolic compounds from water. The best carbon material (MPDC700) showed high adsorption capacity and recyclability, making it a promising adsorbent for removing phenolic compounds from water.