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Potassium and Zeolitic Structure Modified Ultra-microporous Adsorbent Materials from a Renewable Feedstock with Favorable Surface Chemistry for CO2 Capture

Liu, Xin; Sun, Yuan; Liu, Jingjing; Sun, Chenggong; Liu, Hao; Xue, Qian; Smith, Emily; Snape, Colin

Authors

Xin Liu

Yuan Sun

Jingjing Liu

Chenggong Sun

HAO LIU LIU.HAO@NOTTINGHAM.AC.UK
Professor of Energy Engineering

Qian Xue

Emily Smith

COLIN SNAPE COLIN.SNAPE@NOTTINGHAM.AC.UK
Professor of Chemical Technology & Chemical Eng



Abstract

© 2017 American Chemical Society. Novel hierarchically structured microporous biocarbons with exceptionally high capacities for CO2 capture have been synthesized from the abundant agricultural waste of rice husk (RH), using a facile methodology that effectively integrated carbonization, activation, and potassium intercalation into a one-step process. Textural characterization demonstrates that the synthesized biocarbons exhibit exceedingly high ultra-microporosity accounting for up to 95% of total porosity mainly as a result of the naturally occurring silicon compounds within the RH molecular framework structures. With a modest surface area of up to 1035 m2/g and a total pore volume of 0.43 cm3/g, the best performing RH carbon has shown exceptionally high and fully reversible CO2 uptake capacity of 2.0 mmol/g at 25 °C and a CO2 partial pressure of 0.15 bar, which represents one of the highest uptakes ever reported for both carbon and MOF materials usually prepared from using cost-prohibitive precursor materials with cumbersome methodologies. It has been found that up to 50% of the total CO2 uptake is attributable to the unique surface chemistry of the RH carbons, which appears to be dominated by the enhanced formation of extra-framework potassium cations owing to the exceedingly high levels of ultra-microporosity and the presence of zeolitic structures incorporated within the carbon matrices. Characterizations by EDX element mapping, XPS, and heat of adsorption measurements confirm the existence of a range of zeolitic structures, which essentially transforms the RH carbons into a kind of zeolite-carbon nanocomposite material with strong surface affinity for CO2.

Citation

Liu, X., Sun, Y., Liu, J., Sun, C., Liu, H., Xue, Q., …Snape, C. (2017). Potassium and Zeolitic Structure Modified Ultra-microporous Adsorbent Materials from a Renewable Feedstock with Favorable Surface Chemistry for CO2 Capture. ACS Applied Materials and Interfaces, 9(32), 26826-26839. https://doi.org/10.1021/acsami.7b06665

Journal Article Type Article
Acceptance Date Jul 11, 2017
Publication Date Aug 16, 2017
Deposit Date Jul 12, 2017
Publicly Available Date Mar 28, 2024
Journal ACS Applied Materials and Interfaces
Electronic ISSN 1944-8252
Publisher American Chemical Society
Peer Reviewed Peer Reviewed
Volume 9
Issue 32
Pages 26826-26839
DOI https://doi.org/10.1021/acsami.7b06665
Keywords CO2 capture, carbon materials, rice husk, surface chemistry, ultra-microporosity
Public URL https://nottingham-repository.worktribe.com/output/872112
Publisher URL http://pubs.acs.org/doi/abs/10.1021/acsami.7b06665
Additional Information This document is the Accepted Manuscript version of a Published Work that appeared in final form in
ACS Applied Materials & Interfaces, copyright © American Chemical Society after peer review and technical editing by the publisher.
To access the final edited and published work see http://dx.doi.org/10.1021/acsami.7b06665

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