A Spinel Oxynitride with Visible-Light Photocatalytic Activity

Authors

  • Venkata Bharat Ram Boppana,

    1. Centre for Catalytic Science and Technology, Department of Chemical Engineering, University of Delaware, Colburn Laboratory, Newark, DE, 19716 (USA), Fax: (+1) 302 831 1048
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  • Douglas J. Doren Prof.,

    1. Department of Chemistry, University of Delaware, Brown Laboratory, Newark, DE, 19716 (USA)
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  • Raul F. Lobo Prof.

    1. Centre for Catalytic Science and Technology, Department of Chemical Engineering, University of Delaware, Colburn Laboratory, Newark, DE, 19716 (USA), Fax: (+1) 302 831 1048
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Abstract

original image

Spinel zinc gallium oxynitride photocatalysts are prepared by the sol–gel method, at 550 °C. In these materials, of base composition ZnGa2O4 (octahedral Ga), reaction with ammonia leads to ZnGa2OxNy, with a dramatic reduction of the bandgap to 2.7 eV, with just 1.3 % N and no loss of Zn. At 850 °C this phase is converted into wurzite (tetrahedral Ga). The novel oxynitrides also show visible-light photocatalytic activity towards the degradation of methylene blue.

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