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Issue 17, 2015
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Electro-catalytic oxidation of hemicelluloses at the Au electrode

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Abstract

The recently reported electro-catalytic reaction mechanism for the oxidation of cellulose is proposed to work also for the electro-oxidation of other polysaccharides (e.g. hemicelluloses). In this report, the electrochemical reactivity of some hemicelluloses (xylan, arabinoxylan, glucomannan, xyloglucan, and glucuronoxylan) in 1.3 M NaOH solution is described. The electrochemical property of each of the studied hemicelluloses at the Au electrode surface was characterized by cyclic voltammetry. Xylan, xyloglucan and glucuronoxylan were found to be electrochemically active. Electrochemical properties of xylan were further studied by electrochemical impedance spectroscopy. The electrochemical reaction products of xylan, obtained by extensive electrolysis of the xylan solution by cyclic voltammetry, were characterized by FTIR spectroscopy, 13C-NMR spectroscopy, SEM and TEM. The structural studies suggest that the oxidized xylan is a functional material where some of the OH-groups have been oxidized to carboxyl groups making that part of the oxidation product soluble in water under ambient conditions (23 °C, pH 7). The other part remains insoluble in water and contains Au nanoparticles. This work indicates that other polysaccharides than cellulose can also be electrochemically oxidized.

Graphical abstract: Electro-catalytic oxidation of hemicelluloses at the Au electrode

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Supplementary files

Article information


Submitted
11 Dec 2014
Accepted
27 Mar 2015
First published
30 Mar 2015

Phys. Chem. Chem. Phys., 2015,17, 11609-11614
Article type
Paper
Author version available

Electro-catalytic oxidation of hemicelluloses at the Au electrode

Y. Sugano, T. Saloranta, J. Bobacka and A. Ivaska, Phys. Chem. Chem. Phys., 2015, 17, 11609
DOI: 10.1039/C4CP05800C

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