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Issue 7, 2012
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Metal-free oxidation of sulfides by carbon nitride with visible light illumination at room temperature

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Abstract

Mesoporous graphitic carbon nitride (mpg-C3N4) has been developed as a non-metal, heterogeneous photocatalyst for the selective oxidation of sulfides to sulfoxides with O2 at room temperature. Especially, the combination of mpg-C3N4 and aldehydes was a highly active system under visible-light irradiation. For example, mpg-C3N4/isobutyraldehyde catalytic oxidation of methyl phenyl sulfide afforded 97% conversion with 98% selectivity for the methyl phenyl sulfoxide in 4 h. Moreover, the mpg-C3N4 can be easily recovered by filtration and then reused at least four times without losing activity. By exploring the electron spin resonance and some comparative experiments, a catalytic mechanism of this oxidation was provided. Finally, the system also works well in the oxidation of a number of sulfides, including sulfides bearing various groups, and phenyl disulfide. The use of a metal-free heterogeneous catalyst and visible light energy, along with the mild reaction conditions makes this oxidation reaction an environmentally benign and energy-saving chemical process.

Graphical abstract: Metal-free oxidation of sulfides by carbon nitride with visible light illumination at room temperature

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Publication details

The article was received on 31 Jan 2012, accepted on 30 Mar 2012 and first published on 10 May 2012


Article type: Paper
DOI: 10.1039/C2GC35148J
Citation: Green Chem., 2012,14, 1904-1908
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    Metal-free oxidation of sulfides by carbon nitride with visible light illumination at room temperature

    P. Zhang, Y. Wang, H. Li and M. Antonietti, Green Chem., 2012, 14, 1904
    DOI: 10.1039/C2GC35148J

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