Visible-Light-Controlled Oxidation of Glucose using Titania-Supported Silver Photocatalysts

Da Via, Luigi ORCID: 0000-0001-9299-576X, Recchi, Carlo, Davies, Thomas E, Greeves, Nicholas ORCID: 0000-0001-7958-7876 and Lopez-Sanchez, Jose A ORCID: 0000-0003-3064-0140 (2016) Visible-Light-Controlled Oxidation of Glucose using Titania-Supported Silver Photocatalysts. CHEMCATCHEM, 8 (22). pp. 3475-3483. ISSN 1867-3880, 1867-3899

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Abstract

The visible-light-mediated photo-catalytic selective valorisation of glucose using TiO₂-supported Ag nanoparticles is shown for the first time. The optimisation of the catalyst composition, substrate-to-catalyst ratio and reaction medium proved that a near total suppression of the mineralisation pathway could be achieved with a selectivity to partial oxidation products and small-chain monosaccharides as high as 98 %. The primary products were determined to be gluconic acid, arabinose, erythrose, glyceraldehyde and formic acid. Under UVA light, the selectivity to organics decreases because of the production of CO₂ from mineralisation. A reaction mechanism is proposed based on an α-scission process combined with the Ruff degradation reaction, which explains the presence of the oxidation products, the smaller carbohydrates and formic acid. X-ray photoelectron spectroscopy, UV/Vis spectroscopy and microscopy studies showed the presence of plasmonic 4 nm particles of silver that were oxidised to silver oxide over the course of the reaction, and recycling studies revealed that this was not detrimental to activity.

Item Type:	Article
Uncontrolled Keywords:	biomass, oxidation, photocatalysis, silver, supported catalysts
Depositing User:	Symplectic Admin
Date Deposited:	13 Mar 2017 07:38
Last Modified:	07 Dec 2024 19:32
DOI:	10.1002/cctc.201600775
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3006341