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. and Croft, Anna K. (2016) Developing energy efficient lignin biomass processing: towards understanding mediator behaviour in ionic liquids. Faraday Discussions, 190 . pp. 127-145. ISSN 1359-6640

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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.

Item Type: Article
RIS ID: https://nottingham-repository.worktribe.com/output/797495
Schools/Departments: University of Nottingham Ningbo China > Faculty of Science and Engineering > Division of Engineering
University of Nottingham, UK > Faculty of Engineering > Department of Chemical and Environmental Engineering
Identification Number: https://doi.org/10.1039/c5fd00226e
Depositing User: Eprints, Support
Date Deposited: 06 Jun 2016 12:32
Last Modified: 04 May 2020 17:58
URI: https://eprints.nottingham.ac.uk/id/eprint/33646

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