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Issue 5, 2015
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Preparation of water-dispersible porous g-C3N4 with improved photocatalytic activity by chemical oxidation

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Abstract

Hydrophilic treatment of bulk graphene-like carbon nitride (g-C3N4) for future applications has aroused extensive interest, due to its enhanced specific surface area and unusual electronic properties. Herein, water-dispersible g-C3N4 with a porous structure can be obtained by chemical oxidation of bulk g-C3N4 with K2Cr2O7–H2SO4. Acid oxidation results in the production of hydroxyl and carboxyl groups on its basal plane and the formation of a porous structure of g-C3N4 at the same time. The porous g-C3N4 appears as networks with tens of micrometers in width and possesses a high specific surface area of 235.2 m2 g−1. The final concentration of porous g-C3N4 can be up to 3 mg mL−1. Compared with bulk g-C3N4, the as-obtained porous g-C3N4 exhibits excellent water dispersion stability and shows great superiority in photoinduced charge carrier separation and transfer. The photocatalytic activities of porous g-C3N4 towards degradation of organic pollutants are much higher than those of the bulk due to the larger band gap (by 0.2 eV) and specific surface areas.

Graphical abstract: Preparation of water-dispersible porous g-C3N4 with improved photocatalytic activity by chemical oxidation

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Publication details

The article was received on 31 Oct 2014, accepted on 09 Dec 2014 and first published on 11 Dec 2014


Article type: Paper
DOI: 10.1039/C4CP05020G
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Phys. Chem. Chem. Phys., 2015,17, 3309-3315

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    Preparation of water-dispersible porous g-C3N4 with improved photocatalytic activity by chemical oxidation

    H. Li, B. Sun, L. Sui, D. Qian and M. Chen, Phys. Chem. Chem. Phys., 2015, 17, 3309
    DOI: 10.1039/C4CP05020G

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