Synthesis of zinc germanium oxynitride nanotube as a visible-light driven photocatalyst for NO x decomposition through ordered morphological transformation from Zn 2 GeO 4 nanorod obtained by hydrothermal reaction

Oxynitrides with narrow band gap are promising materials as visible-light sensitive photocatalysts, because introduction of nitrogen ions can negatively shift the position of valence band maximum of the corresponding oxides to negative side. (Zn Ge)(N O ) with wurtzite structure is one of the oxynit...

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Bibliographic Details
Published inJournal of hazardous materials Vol. 396; p. 122709
Main Authors Wang, Jingwen, Asakura, Yusuke, Yin, Shu
Format Journal Article
LanguageEnglish
Published Netherlands 27.04.2020
Subjects
Hydrothermal synthesis
Nanotube
Nitridation
Photocatalysts
Oxynitride
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Summary:Oxynitrides with narrow band gap are promising materials as visible-light sensitive photocatalysts, because introduction of nitrogen ions can negatively shift the position of valence band maximum of the corresponding oxides to negative side. (Zn Ge)(N O ) with wurtzite structure is one of the oxynitride materials. (Zn Ge)(N O ) with nanotube morphology was synthesized by nitridation of Zn GeO nanorods at 800 °C for 6 h. During the nitridation process, the nanorod with smooth surface was transformed into nanotube with rough surface in spite of no template for formation of tube structure. The nanotube formation can be caused by ordered morphological transformation from Zn GeO nanorod during the nitridation. (Zn Ge)(N O ) nanotube exhibited a large specific surface area due to its nanotube morphology and the ability to be responsive to visible light because of the narrow band gap of 2.76 eV. Compared to (Zn Ge)(N O ) synthesized by conventional solid state reaction, the optimized (Zn Ge)(N O ) nanotube possessed enhanced photocatalytic NO decomposition activity under both ultraviolet and visible light irradiation.
ISSN:1873-3336