Issue 57, 2021

Biomass derived hierarchical porous carbon for high-performance O2/N2 adsorption; a new green self-activation approach

Abstract

Biomass-derived porous carbons are the most common adsorbent materials for O2/N2 adsorption because of their excellent textural properties, high surface area, and low expense. A new synthesis method based on a self-activation technique was developed for a new green porous carbon adsorbent. This ecofriendly system was used for the synthesis of hierarchical porous carbons from walnut-shell precursors. The sorbent was successfully synthesized by facile one-step carbonization, with the activating reagents being gases released during the activation. The sample morphology and structure were characterized by field emission scanning electron microscopy, high-resolution transmission electron microscopy, Raman, Fourier transform infrared spectra, X-ray photoelectron spectroscopy, X-ray powder diffraction, thermogravimetric, and differential thermal analysis. The optimal porous carbons were synthesized at 1000 °C, providing a surface area as high as 2042.4 (m2 g−1) and micropore volume of about 0.499 (m3 g−1). At 298 °K under 9.5 bar pressure, the potential for O2/N2 separation using porous carbon samples was studied, and the sips isotherms with the highest adsorption potential were determined to be 2.94 (mmol g−1) and 2.67 (mmol g−1), respectively. The sample exhibited stable O2/N2 separation over ten cycles, showing high reusability for air separation. Finally, the technology described presents a promising strategy for producing eco-friendly porous carbon from a variety of biomass on an industrial scale.

Graphical abstract: Biomass derived hierarchical porous carbon for high-performance O2/N2 adsorption; a new green self-activation approach

Article information

Article type
Paper
Submitted
09 Sep 2021
Accepted
28 Oct 2021
First published
10 Nov 2021
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2021,11, 36125-36142

Biomass derived hierarchical porous carbon for high-performance O2/N2 adsorption; a new green self-activation approach

H. Mashhadimoslem, M. Safarzadeh, A. Ghaemi, H. Banna Motejadded Emrooz and M. Barzegar, RSC Adv., 2021, 11, 36125 DOI: 10.1039/D1RA06781H

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