Development of chemically activated N-enriched carbon adsorbents from urea-formaldehyde resin for CO2 adsorption: Kinetics, isotherm, and thermodynamics.

摘要: Abstract Nitrogen enriched carbon adsorbents with high surface areas were successfully prepared by carbonizing the low-cost urea formaldehyde resin, followed KOH activation. Different characterization techniques used to determine structure and functional groups. Maximum area total pore volume of 4547 m 2  g −1 4.50 cm 3 found controlling activation conditions. The optimized sample denoted as UFA-3-973 possesses a remarkable area, which is be one best achieved so far. content this was 22.32%. Dynamic CO uptake capacity determined thermogravimetrically at different concentrations (6–100%) adsorption temperatures (303–373 K) have much more relevance for flue gas application. Highest 2.43 mmol g obtained 303 K under pure flow. Complete regenerability adsorbent over four adsorption-desorption cycles obtained. Fractional order kinetic model provided description all concentrations. Heterogeneity confirmed from Langmuir Freundlich isotherms fits isosteric heat values. Exothermic, spontaneous feasible nature process thermodynamic parameter combination large makes new promising material capture power plant other relevant applications.