Cu(II) vitamin C tunes photocatalytic activity of TiO2 nanoparticles for visible light-driven aerobic oxidation of benzylic alcohols

Narges Pourmorteza; Maasoumeh Jafarpour; Fahimeh Feizpour; Abdolreza Rezaeifard

doi:10.1039/D0RA00075B

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Cu(ii) vitamin C tunes photocatalytic activity of TiO₂ nanoparticles for visible light-driven aerobic oxidation of benzylic alcohols†

Narges Pourmorteza,^a Maasoumeh Jafarpour,

*^a Fahimeh Feizpour^a and Abdolreza Rezaeifard

*^a

Author affiliations

* Corresponding authors

^a Catalysis Research Laboratory, Department of Chemistry, Faculty of Science, University of Birjand, Birjand, Iran
E-mail: mjafarpour@birjand.ac.ir, Jafarpouryas@gmail.com, rrezaeifard@birjand.ac.ir
Tel: +98 5632202515

Abstract

The incorporation of Cu(OAc)₂ into ascorbic acid coated TiO₂ nanoparticles easily provided a new heterogeneous visible-light active titania-based photocatalyst (TiO₂-AA-Cu(II)) which was characterized by different techniques such as FT-IR, XPS, ICP-AES, TGA and TEM. A red-shift of the band-edge and a reduction of the band-gap (2.8 eV vs. 3.08 for TiO₂) were demonstrated by UV-DRS and Tauc plots. The combination of the as-prepared TiO₂-AA-Cu(II) nanoparticles with TEMPO and molecular oxygen (air) afforded an active catalytic system for the selective oxidation of diverse set of benzylic alcohols under solvent-free conditions. A photoassisted pathway was confirmed for oxidation reactions evidenced by good correlation between apparent quantum yield (AQY) and diffuse reflectance spectra (DRS) of the as-prepared nanohybrid. The spectral data and recycling experiments demonstrated the structural stability of the title copper photocatalyst during oxidation reactions.

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Article information

DOI: https://doi.org/10.1039/D0RA00075B
Article type: Paper
Submitted: 03 Jan 2020
Accepted: 15 Mar 2020
First published: 25 Mar 2020
This article is Open Access

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RSC Adv., 2020,10, 12053-12059

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Cu(II) vitamin C tunes photocatalytic activity of TiO₂ nanoparticles for visible light-driven aerobic oxidation of benzylic alcohols

N. Pourmorteza, M. Jafarpour, F. Feizpour and A. Rezaeifard, RSC Adv., 2020, 10, 12053 DOI: 10.1039/D0RA00075B

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