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Venkata Bharat Ram Boppana, Douglas J. Doren and Raul F. Lobo A Spinel Oxynitride with Visible-Light Photocatalytic Activity ChemSusChem 3

Article first published online: 11 JUN 2010 | DOI: 10.1002/cssc.201000036

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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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