Wang Shiqi, Zhang Zeling, Huo Wenyi, Zhu Kui, Zhang Xuhai, Zhou Xuefeng, Fang Feng, Xie Zonghan, Jiang Jianqing
School of Materials Science and Engineering, Southeast University, Nanjing, 211189, China.
School of Materials Science and Engineering, Southeast University, Nanjing, 211189, China.
J Hazard Mater. 2020 Nov 15;399:123016. doi: 10.1016/j.jhazmat.2020.123016. Epub 2020 May 28.
Ag-TiO 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 (CrO (Cr (VI)) as a model compound under visible light irradiation. XRD and XPS studies reveal the development of preferred orientation along [001] in anatase TiO 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-TiO nanotube arrays having preferred crystal orientation exhibit superior separation/transfer of photo-induced charges. Furthermore, the Ag-TiO 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 AgO. TNA-3Ag exhibits the highest photocatalytic activities by removing 99.1 % Cr (VI) in 90 min under visible light illumination.
通过磁控溅射和阳极氧化在ITO玻璃上制备了具有晶体择优取向的Ag-TiO纳米管阵列薄膜。进行了全面表征以确定薄膜的组成和微观结构特征。通过以六价铬（CrO (Cr(VI))作为模型化合物在可见光照射下的还原反应来评估光催化活性。XRD和XPS研究表明，通过在磁控溅射过程中调整Ag含量，锐钛矿TiO纳米管沿[001]方向形成了择优取向。这种异常行为归因于Ag辅助锐钛矿(001)表面能的最小化。具有择优晶体取向的Ag-TiO纳米管阵列表现出优异的光生电荷分离/转移性能。此外，由于Ag诱导的表面等离子体共振（SPR）效应以及TNA与AgO之间形成异质结，Ag-TiO纳米管阵列对可见光的吸收得到改善。TNA-3Ag在可见光照射下90分钟内去除99.1%的Cr(VI)，表现出最高的光催化活性。
