One-step conversion of agro-wastes to nanoporous carbons: Role in separation of greenhouse gases.

Autor: Saha D; Department of Chemical Engineering, Widener University, One University Place, Chester, PA 19013, USA. Electronic address: dsaha@widener.edu., Taylor B; Department of Chemical Engineering, Widener University, One University Place, Chester, PA 19013, USA., Alexander N; Department of Chemical Engineering, Widener University, One University Place, Chester, PA 19013, USA., Joyce DF; Department of Chemical Engineering, Widener University, One University Place, Chester, PA 19013, USA., Faux GI; Department of Chemical Engineering, Widener University, One University Place, Chester, PA 19013, USA., Lin Y; Department of Chemical Engineering, Widener University, One University Place, Chester, PA 19013, USA., Shteyn V; Department of Chemical Engineering, Widener University, One University Place, Chester, PA 19013, USA., Orkoulas G; Department of Chemical Engineering, Widener University, One University Place, Chester, PA 19013, USA.
Jazyk: angličtina
Zdroj: Bioresource technology [Bioresour Technol] 2018 May; Vol. 256, pp. 232-240. Date of Electronic Publication: 2018 Feb 06.
DOI: 10.1016/j.biortech.2018.02.026
Abstrakt: Highly microporous carbons have been synthesized from four types of agro-wastes of lignin, walnut shells, orange peels and apricot seeds by one-step carbonization/activation with potassium hydroxide (KOH) in varying ratios. The resultant carbons demonstrated BET specific surface areas of 727-2254 m 2 /g, and total pore volumes 0.34-1.14 cm 3 /g. These are higher than the majority of agro-waste derived carbons reported in the literature. For all the carbons, CO 2 adsorption at 298 K was higher than SF 6 followed by N 2 suggesting a possible separation of CO 2 and SF 6 from N 2 . The adsorbed amounts of CO 2 at 298 K and 273 K and at pressures up to 760 Torr were 7.24 and 9.4 mmol/g, respectively which, to the best of our knowledge, are the highest CO 2 uptakes in these temperatures by any carbon material reported so far. For all the gases, selectivity, mixed adsorption isotherms and adsorption breakthrough have been simulated from experimental data.
(Copyright © 2018 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
Externí odkaz: