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Visible‐Light‐Controlled Oxidation of Glucose using Titania‐Supported Silver Photocatalysts
Author(s) -
Da Vià Luigi,
Recchi Carlo,
Davies Thomas E.,
Greeves Nicholas,
LopezSanchez Jose A.
Publication year - 2016
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201600775
Subject(s) - formic acid , catalysis , gluconic acid , chemistry , selectivity , x ray photoelectron spectroscopy , photocatalysis , photochemistry , inorganic chemistry , partial oxidation , nuclear chemistry , organic chemistry , chemical engineering , engineering
Abstract The visible‐light‐mediated photo‐catalytic selective valorisation of glucose using TiO 2 ‐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 CO 2 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.