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A Spinel Oxynitride with Visible‐Light Photocatalytic Activity
Author(s) -
Boppana Venkata Bharat Ram,
Doren Douglas J.,
Lobo Raul F.
Publication year - 2010
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201000036
Subject(s) - photocatalysis , spinel , octahedron , visible spectrum , zinc , band gap , materials science , gallium , methylene blue , degradation (telecommunications) , chemical engineering , chemistry , catalysis , computer science , crystallography , optoelectronics , crystal structure , metallurgy , organic chemistry , telecommunications , engineering
Spinel zinc gallium oxynitride photocatalysts are prepared by the sol–gel method, at 550 °C. In these materials, of base composition ZnGa 2 O 4 (octahedral Ga), reaction with ammonia leads to ZnGa 2 O x N y , 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.