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Cu(ii) vitamin C tunes photocatalytic activity of TiO nanoparticles for visible light-driven aerobic oxidation of benzylic alcohols. | LitMetric

The incorporation of Cu(OAc) into ascorbic acid coated TiO nanoparticles easily provided a new heterogeneous visible-light active titania-based photocatalyst (TiO-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 3.08 for TiO) were demonstrated by UV-DRS and Tauc plots. The combination of the as-prepared TiO-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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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9050754PMC
http://dx.doi.org/10.1039/d0ra00075bDOI Listing

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