TY - JOUR
T1 - Synthesis of zinc germanium oxynitride nanotube as a visible-light driven photocatalyst for NOx decomposition through ordered morphological transformation from Zn2GeO4 nanorod obtained by hydrothermal reaction
AU - Wang, Jingwen
AU - Asakura, Yusuke
AU - Yin, Shu
N1 - Funding Information:
We thank Dr. Y. Hayasaka (the Electron Microscope Center, Tohoku Univ.) for TEM, STEM-EDS mapping, and ED analysis. This work was supported by the JSPS Grant-in-Aid for Young Scientists (B) (no. 17K14542 ) and for Scientific Research on Innovative Areas “Mixed anion” (no. JP16H06439 ), and by the Dynamic Alliance for Open Innovation Bridging Human , Environment and Materials in Network Joint Research Center for Materials and Devices .
Publisher Copyright:
© 2020 Elsevier B.V.
PY - 2020/9/5
Y1 - 2020/9/5
N2 - 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. (Zn1+xGe)(N2Ox) with wurtzite structure is one of the oxynitride materials. (Zn1+xGe)(N2Ox) with nanotube morphology was synthesized by nitridation of Zn2GeO4 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 Zn2GeO4 nanorod during the nitridation. (Zn1+xGe)(N2Ox) 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 (Zn1+xGe)(N2Ox) synthesized by conventional solid state reaction, the optimized (Zn1+xGe)(N2Ox) nanotube possessed enhanced photocatalytic NOx decomposition activity under both ultraviolet and visible light irradiation.
AB - 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. (Zn1+xGe)(N2Ox) with wurtzite structure is one of the oxynitride materials. (Zn1+xGe)(N2Ox) with nanotube morphology was synthesized by nitridation of Zn2GeO4 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 Zn2GeO4 nanorod during the nitridation. (Zn1+xGe)(N2Ox) 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 (Zn1+xGe)(N2Ox) synthesized by conventional solid state reaction, the optimized (Zn1+xGe)(N2Ox) nanotube possessed enhanced photocatalytic NOx decomposition activity under both ultraviolet and visible light irradiation.
KW - Hydrothermal synthesis
KW - Nanotube
KW - Nitridation
KW - Oxynitride
KW - Photocatalysts
UR - http://www.scopus.com/inward/record.url?scp=85083706724&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85083706724&partnerID=8YFLogxK
U2 - 10.1016/j.jhazmat.2020.122709
DO - 10.1016/j.jhazmat.2020.122709
M3 - Article
C2 - 32353731
AN - SCOPUS:85083706724
SN - 0304-3894
VL - 396
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
M1 - 122709
ER -