Gold nanoparticle supported on mesoporous vanadium oxide for photo-oxidation of 2-naphthol with hydrogen peroxide and aerobic oxidation of benzyl alcohols

Selective photocatalytic oxidation of benzyl alcohol and 2-naphthol. [Display omitted] •Mesoporous gold-vanadium with multi-functional catalytic activity.•Photocatalytic oxidation of 2-naphthol with hydrogen peroxide.•Photocatalytic oxidation of benzyl alcohol.•Enhancement of photocatalytic ability...

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Bibliographic Details
Published in:	Journal of environmental chemical engineering Vol. 8; no. 5; p. 104268
Main Authors:	Das, Biraj, Sharma, Mukesh, Baruah, Manash J., Mounash, Bedanta P., Karunakar, Galla V., Bania, Kusum K.
Format:	Journal Article
Language:	English
Published:	Elsevier Ltd 01-10-2020
Subjects:	2-Naphthol AuVOx nanocatalyst Benzyl alcohol MWCNTs Photocatalytic oxidation 2-Naphthol MWCNTs Benzyl alcohol AuVOx nanocatalyst Photocatalytic oxidation
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Summary:	Selective photocatalytic oxidation of benzyl alcohol and 2-naphthol. [Display omitted] •Mesoporous gold-vanadium with multi-functional catalytic activity.•Photocatalytic oxidation of 2-naphthol with hydrogen peroxide.•Photocatalytic oxidation of benzyl alcohol.•Enhancement of photocatalytic ability on hybridization with multi-walled carbon nanotubes.•Mechanistic study through EPR and photo luminescence study. Vanadium oxide supported gold nanocatalysts designated as AuVOx was found to be highly efficient for photocatalytic oxidation of benzyl alcohol and 2-naphthol. The photocatalytic ability of the AuVOx catalyst towards the selective oxidation of 2-naphthol to BINOL was found to be dependent on the nature of the support. The selectivity of the reaction was found to be significantly altered on hybridization with multi-walled carbon nanotubes (AuVOx-MWCNTs). The well-resolved surface plasmon resonance (SPR) band originated from the gold nanoparticles (Au-NPs) on the vanadium oxides support helped in stimulating the photo-oxidation of benzyl alcohol to benzaldehyde and 2-naphthol to BINOL with almost 100% selectivity. The most notable achievement using the AuVOx and AuVOx-MWCNTs catalyst was in the successful photo-oxidation of 2-naphthol to BINOL in presence of hydrogen peroxide (H2O2). The photo-activity of the material and the creation of oxygen defect sites participated in the photochemical processes were estimated from photoluminescence analysis and ESR study. The photochemical reaction was supposed to proceed via superoxide radical generation favored by the oxygen defect sites.
ISSN:	2213-3437 2213-3437
DOI:	10.1016/j.jece.2020.104268