Selective oxidation of glycerol mediated by surface plasmon of gold nanoparticles deposited on titanium dioxide nanowires

This paper describes an alternative method for the in situ synthesis of gold nanoparticles (AuNPs) with a particle size of less than 3 nm, using nanoreactors formed by reverse micelles of 1,4-bis-(2-ethylhexyl) sulfosuccinate sodium (AOT) and nanoparticle stabilization with l-cysteine, which favor t...

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Bibliographic Details
Published in:	Chemosphere (Oxford) Vol. 364; p. 142995
Main Authors:	Martínez Q, Henry, Neira, Jane A., Amaya, Álvaro A., Blach V, Diana, Campos, Cristian H., Martínez O, Fernando
Format:	Journal Article
Language:	English
Published:	England Elsevier Ltd 01-09-2024
Subjects:	Glycerol oxidation Gold nanoparticles Plasmonic photocatalysis Reverse micelle Glycerol oxidation Reverse micelle Gold nanoparticles Plasmonic photocatalysis
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Summary:	This paper describes an alternative method for the in situ synthesis of gold nanoparticles (AuNPs) with a particle size of less than 3 nm, using nanoreactors formed by reverse micelles of 1,4-bis-(2-ethylhexyl) sulfosuccinate sodium (AOT) and nanoparticle stabilization with l-cysteine, which favor the preparation of nanoparticles with size and shape control, which are homogeneously dispersed (1% by weight) on the support of titanium dioxide nanowires (TNWs). To study the activity and selectivity of the prepared catalyst (AuNPs@TNWs), an aqueous solution of 40 mM glycerol was irradiated with a green laser (λ = 530 nm, power = 100 mW) in the presence of the catalyst and O2 as an oxidant at 22 °C for 6 h, obtaining a glycerol conversion of 86% with a selectivity towards hydroxypyruvic acid (HA) of more than 90%. From the control and reactions, we concluded that the Ti–OH groups promote the glycerol adsorption on the nanowires surface and the surface plasmon of the gold nanoparticles favors the selectivity of the reaction towards the hydroxypyruvic acid. [Display omitted] •The reverse micelle method allows the deposition of small Au NPs nanoparticles.•Reactive –OH groups on H2Ti3O7 nanowires surface allow the adsorption of glycerol.•The Au NPs absorb visible green light.•AuNPs@HTNWs and AuNPs@TNWs allow the activation of O2 via formation of O2.•-.•Hydroxypyruvic acid was obtained as the main product in glycerol oxidation.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0045-6535 1879-1298 1879-1298
DOI:	10.1016/j.chemosphere.2024.142995