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

Document Type

Journal Article

Publication Title

Journal of Hazardous Materials

ISSN

03043894

Volume

399

PubMed ID

32535517

Publisher

Elsevier

School

School of Engineering

RAS ID

32495

Comments

Wang, S., Zhang, Z., Huo, W., Zhu, K., Zhang, X., Zhou, X., ... & Jiang, J. (2020). Preferentially oriented Ag-TiO2 nanotube array film: An efficient visible-light-driven photocatalyst. Journal of Hazardous Materials, 399, article 123016. https://doi.org/10.1016/j.jhazmat.2020.123016

Abstract

© 2020 Elsevier B.V. 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.

DOI

10.1016/j.jhazmat.2020.123016

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