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Titanate nanotube confined merger of organic photocatalysis and TEMPO catalysis for highly selective aerobic oxidation of sulfides

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Abstract

1D titanate (H2Ti3O7) nanotubes were prepared by a hydrothermal treatment of TiO2 under 10 M NaOH and ensuing acid exchange process. Here, it is discovered that H2Ti3O7 nanotubes can facilitate the merger of organic photocatalysis and TEMPO catalysis. Confined within H2Ti3O7 nanotubes, the organic photocatalyst erythrosin B (ErB) could drive the highly selective aerobic oxidation of sulfides under irradiation of green light-emitting diodes (LEDs), when 0.5 mol% of TEMPO was added as a co-catalyst. The turnover number (TON) for photocatalytic selective aerobic oxidation of thioanisole in terms of ErB is 2450, which is hitherto the best reported TON. Apart from confining the successful merger of ErB photocatalysis and TEMPO catalysis, H2Ti3O7 nanotubes not only activate O2 to generate superoxide anion radical (O2˙), but also ensure high selectivity of sulfoxides with their abundant surface hydroxyl groups. This work represents a crucial step forward in selective oxidation reactions by materials design of dye-semiconductor assembly photocatalysts.

Graphical abstract: Titanate nanotube confined merger of organic photocatalysis and TEMPO catalysis for highly selective aerobic oxidation of sulfides

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Article information


Submitted
19 Dec 2019
Accepted
07 Jan 2020
First published
07 Jan 2020

Sustainable Energy Fuels, 2020, Advance Article
Article type
Paper

Titanate nanotube confined merger of organic photocatalysis and TEMPO catalysis for highly selective aerobic oxidation of sulfides

X. Ma and X. Lang, Sustainable Energy Fuels, 2020, Advance Article , DOI: 10.1039/C9SE01265F

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