Preferentially oriented Ag-TiO2 nanotube array film: An efficient visible-light-driven photocatalyst

[Display omitted] •Ag-TiO2 nanotube array thin films were prepared via magnetron sputtering and anodization treatment.•Ag additions resulted in the preferred orientation of crystals in the TiO2 nanotube arrays.•Ag species enhanced the visible-light absorption of the thin film photocatalysts.•The TNA...

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Veröffentlicht in:Journal of hazardous materials 2020-11, Vol.399, p.123016-123016, Article 123016
Hauptverfasser: Wang, Shiqi, Zhang, Zeling, Huo, Wenyi, Zhu, Kui, Zhang, Xuhai, Zhou, Xuefeng, Fang, Feng, Xie, Zonghan, Jiang, Jianqing
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Sprache:eng
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Zusammenfassung:[Display omitted] •Ag-TiO2 nanotube array thin films were prepared via magnetron sputtering and anodization treatment.•Ag additions resulted in the preferred orientation of crystals in the TiO2 nanotube arrays.•Ag species enhanced the visible-light absorption of the thin film photocatalysts.•The TNA-3Ag exhibits superior photocatalytic performance in treating wastewater containing heavy metal. Ag-TiO2 nanotube array films with the preferential orientation of crystals were fabricated on ITO glass by magnetron sputtering and anodization. Comprehensive characterization was performed to ascertain the composition and microstructure characteristics of thin films. The photocatalytic activities were evaluated through the reduction of hexavalent chromium (Cr2O72− (Cr (VI)) as a model compound under visible light irradiation. XRD and XPS studies reveal the development of preferred orientation along [001] in anatase TiO2 nanotubes by adjusting the Ag content during magnetron sputtering. Such unusual behavior is attributed to the minimization of anatase (001) surface energy assisted by Ag. The Ag-TiO2 nanotube arrays having preferred crystal orientation exhibit superior separation/transfer of photo-induced charges. Furthermore, the Ag-TiO2 nanotube arrays show improved absorption of visible light due to the SPR effect induced by Ag and the formation of heterojunction between the TNAs and Ag2O. TNA-3Ag exhibits the highest photocatalytic activities by removing 99.1 % Cr (VI) in 90 min under visible light illumination.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2020.123016