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The Synergistic Character of Highly N‐Doped Coconut–Shell Activated Carbon for Efficient CO 2 Capture
Author(s) -
Rajasekaran Navvamani,
Vinoba Mari,
AlSheeha Hanadi,
Rana Mohan S.
Publication year - 2021
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.202102522
Subject(s) - adsorption , activated carbon , amine gas treating , acetone , chemistry , carbon fibers , sorbent , nitrogen , base (topology) , surface modification , yield (engineering) , chemical engineering , inorganic chemistry , nuclear chemistry , organic chemistry , materials science , mathematical analysis , mathematics , composite number , engineering , composite material , metallurgy
The coconut shell‐based activated carbon (AC) surface was effectively anchored with amine moieties with acid treatment followed by tetraethylenepentamine (TEPA) anchoring. The activated carbon surface enhanced with basicity is likely to increase the sorbent properties towards CO 2 adsorption. The AC surface was modified by varying TEPA concentrations. After amine doping, significant loss in textural property indicates their occupation inside the pores and surfaces. Further, the samples were thermally activated to retrieve the textural properties. The physicochemical properties of modified carbon were characterized using BET, TPD, FT‐IR, Raman spectroscopy and elemental composition. The amine‐modified and thermally activated carbons were tested for CO 2 adsorption up to 25 bar at 25 °C. The acid‐base properties of N‐doped carbons were evaluated using isopropanol as a model test reaction at atmospheric pressure. The IPA reaction products of acetone and propene were quantified for their acid‐base nature and correlated to CO 2 adsorption capacities. The CO 2 adsorption capacity increases by tailoring synergistic properties between surface basicity and micropores. Hence, 20 % TEPA‐derived nitrogen‐enriched carbon reveals a higher yield of acetone 73 %, which in turn enhanced CO 2 adsorption capacity of 9.9 mmol/g, and it is found to be a suitable applicant for CO 2 capture.