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Vol. 26 No. 12 (2014): Vol 26 Issue 12

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CdS-Sensitized TiO2 Nanotube Arrays: Preparation and Enhanced Photocatalytic Activity

https://doi.org/10.14233/ajchem.2014.16489
Yunsong Yuan
School of Urban Construction and Environmental Engineering, Chongqing University, Chongqing 400030, P.R. China
Lingjie Li
School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, P.R. China
Jinglei Lei
School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, P.R. China
Jianxin He
School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, P.R. China
Jing Xu
School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, P.R. China
Shengtao Zhang
School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, P.R. China

Corresponding Author(s) : Jinglei Lei

jllei@cqu.edu.cn

Asian Journal of Chemistry, Vol. 26 No. 12 (2014): Vol 26 Issue 12

Abstract

CdS-sensitized TiO2 nanotube arrays (CdS-TNTAs) were prepared by depositing CdS into the crystallized anodic TiO2 nanotube arrays via sequential chemical bath deposition (S-CBD) method. Characterizations via XPS and FE-SEM show that the CdS nanoparticles, approximately 20-30 nm in diameter, were deposited on TiO2 nanotubes arrays. UV-visible absorption spectra illustrate that sensitizing TiO2 nanotubes with CdS extends the absorption response of TiO2 nanotube arrays into the visible region. The photocatalytic efficiency of CdS-TNTAs is significantly enhanced as compared to the pristine TiO2 nanotube arrays, which can be attributed to the deposition of CdS effectively stimulating the charge separation and thus hindering the recombination of electron/hole pairs of TiO2 nanotube arrays. It is also demonstrated that the CdS deposition condition, such as the immersion time and cycles of sequential chemical bath deposition treatment, has important impacts on improving the photocatalytic efficiency of CdS-TNTAs. The appropriate immersion time (e.g. 5 or 10 min in the present work) and cycles (e.g. 2 or 1 cycle) of sequential chemical bath deposition process benefit the photocatalysis greatly.

Keywords

TiO2 nanotube array CdS Anodization Sequential chemical bath deposition Photocatalysis Methyl orange
Yuan, Y., Li, L., Lei, J., He, J., Xu, J., & Zhang, S. (2014). CdS-Sensitized TiO2 Nanotube Arrays: Preparation and Enhanced Photocatalytic Activity. Asian Journal of Chemistry, 26(12), 3569–3573. https://doi.org/10.14233/ajchem.2014.16489
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