Skip to main content

Research Repository

Advanced Search

Biomass to porous carbon in one step: directly activated biomass for high performance CO2 storage

Balahmar, Norah; Al-Jumialy, Abdul Salam; Mokaya, Robert

Authors

Norah Balahmar

Abdul Salam Al-Jumialy



Abstract

This report explores the direct conversion of biomass to activated carbons in one step. We demonstrate the successful conversion of a range of biomass sources, namely, sawdust, the flowering plant Paeonia lactiflora and seaweed (Sargassum fusiforme), to activated carbons via a direct activation process that negates the need for hydrothermal carbonisation or pyrolysis. This is a departure from established practice that requires biomass sources to be first enriched to carbonaceous matter via hydrothermal carbonisation or pyrolysis prior to activation. The direct activation, with KOH as an activating agent, generated activated carbons at yields that are comparable or higher than those of conventional activation routes. The directly activated carbons, whilst offering the advantages of simplicity, lower cost and a greener more sustainable synthesis route, have properties that are similar or superior to analogous carbons prepared via conventional methods. In particular the textural properties, surface functionality and level of graphitic ordering were found to be similar to those of conventionally generated activated carbons. Depending on the activation conditions, the porosity of the directly activated carbons may be tailored towards pore channels of size 5–7 Å, which favour post-combustion CO2 uptake and thus the carbons capture up to 1.3 and 4.6 mmol g−1 of CO2 at 0.15 and 1 bar, respectively, and 25 °C with high selectivity. On the other hand, at higher levels of activation, the directly activated carbons can be tailored towards possessing a greater proportion of larger micropores (10–20 Å pores) and small mesopores (20–30 Å pores) so as to optimize CO2 uptake at moderate to high pressure, for example up to 22 mmol g−1 (at 25 °C) and 31 mmol g−1 (at 0 °C) at 20 bar.

Citation

Balahmar, N., Al-Jumialy, A. S., & Mokaya, R. (2017). Biomass to porous carbon in one step: directly activated biomass for high performance CO2 storage. Journal of Materials Chemistry A, 5(24), https://doi.org/10.1039/C7TA01722Gk

Journal Article Type Article
Acceptance Date May 15, 2017
Publication Date May 15, 2017
Deposit Date Jun 30, 2017
Publicly Available Date Jun 30, 2017
Journal Journal of Materials Chemistry A
Print ISSN 2050-7488
Electronic ISSN 2050-7496
Publisher Royal Society of Chemistry
Peer Reviewed Peer Reviewed
Volume 5
Issue 24
DOI https://doi.org/10.1039/C7TA01722Gk
Public URL http://eprints.nottingham.ac.uk/id/eprint/43861
Publisher URL http://pubs.rsc.org/en/Content/ArticleLanding/2017/TA/C7TA01722G#!divAbstract
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf

Files

RMokayaBiomass to porous carbon in one step Directly activated biomass for high performance CO2 storage (003).pdf (6.9 Mb)
PDF

Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





You might also like



Downloadable Citations