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Developing energy efficient lignin biomass processing – towards understanding mediator behaviour in ionic liquids

Eshtaya, Majd; Ejigu, Andinet; Stephens, Gill; Walsh, Darren A.; Chen, George Z.; Croft, Anna K.

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Authors

Majd Eshtaya

Andinet Ejigu

Gill Stephens

DARREN WALSH DARREN.WALSH@NOTTINGHAM.AC.UK
Professor of Chemistry

Anna K. Croft



Abstract

Environmental concerns have brought attention to the requirement for more efficient and renewable processes for chemicals production. Lignin is the second most abundant natural polymer, and might serve as a sustainable resource for manufacturing fuels and aromatic derivatives for the chemicals industry after being depolymerised. In this work, the mediator 2,2′-azino-bis(3-ethylbenthiazoline-6-sulfonic acid) diammonium salt (ABTS), commonly used with enzyme degradation systems, has been evaluated by means of cyclic voltammetry (CV) for enhancing the oxidation of the non-phenolic lignin model compound veratryl alcohol and three types of lignin (organosolv, Kraft and lignosulfonate) in the ionic liquid 1-ethyl-3-methylimidazolium ethyl sulfate, ([C2mim][C2SO4]). The presence of either veratryl alcohol or organosolv lignin increased the second oxidation peak of ABTS under select conditions, indicating the ABTS-mediated oxidation of these molecules at high potentials in [C2mim][C2SO4]. Furthermore, CV was applied as a quick and efficient way to explore the impact of water in the ABTS-mediated oxidation of both organosolv and lignosulfonate lignin. Higher catalytic efficiencies of ABTS were observed for lignosulfonate solutions either in sodium acetate buffer or when [C2mim][C2SO4] (15 v/v%) was present in the buffer solution, whilst there was no change found in the catalytic efficiency of ABTS in [C2mim][C2SO4]–lignosulfonate mixtures relative to ABTS alone. In contrast, organosolv showed an initial increase in oxidation, followed by a significant decrease on increasing the water content of a [C2mim][C2SO4] solution.

Citation

Eshtaya, M., Ejigu, A., Stephens, G., Walsh, D. A., Chen, G. Z., & Croft, A. K. (2016). Developing energy efficient lignin biomass processing – towards understanding mediator behaviour in ionic liquids. Faraday Discussions, 190, 127-145. https://doi.org/10.1039/c5fd00226e

Journal Article Type Article
Acceptance Date Jan 7, 2016
Online Publication Date Jan 7, 2016
Publication Date Aug 1, 2016
Deposit Date Jun 6, 2016
Publicly Available Date Jun 6, 2016
Journal Faraday Discussions
Print ISSN 1359-6640
Electronic ISSN 1364-5498
Publisher Royal Society of Chemistry
Peer Reviewed Peer Reviewed
Volume 190
Pages 127-145
DOI https://doi.org/10.1039/c5fd00226e
Public URL https://nottingham-repository.worktribe.com/output/797495
Publisher URL http://dx.doi.org/10.1039/c5fd00226e
Contract Date Jun 6, 2016

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