Electro-catalytic oxidation of hemicelluloses at the Au electrode

A1 Originalartikel i en vetenskaplig tidskrift (referentgranskad)


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Publikationens författare: Yasuhito Sugano, Tiina Saloranta, Johan Bobacka, Ari Ivaska
Förläggare: ROYAL SOC CHEMISTRY
Publiceringsår: 2015
Tidskrift: Physical Chemistry Chemical Physics
Tidskriftsakronym: PHYS CHEM CHEM PHYS
Volym: 17
Nummer: 17
Artikelns första sida, sidnummer: 11609
Artikelns sista sida, sidnummer: 11614
Antal sidor: 6
ISSN: 1463-9076
eISSN: 1463-9084


Abstrakt

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, C-13-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 degrees 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.

Senast uppdaterad 2019-14-12 vid 03:02