Open Access Nano Express

Hydrothermal growth of TiO2 nanowire membranes sensitized with CdS quantum dots for the enhancement of photocatalytic performance

Yang Li12, Lili Zhang1, Wenjian Wu1, Peng Dai1, Xinxin Yu1, Mingzai Wu1* and Guang Li1

Author Affiliations

1 School of Physics and Materials Science, Anhui University, Hefei 230039, People's Republic of China

2 School of Science, Anhui University of Science and Technology, Huainan 232001, People's Republic of China

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Nanoscale Research Letters 2014, 9:270  doi:10.1186/1556-276X-9-270

Published: 29 May 2014

Abstract

In this paper, TiO2 nanowires (NWs) on Ti foils were prepared using a simple hydrothermal approach and annealing treatment. CdS quantum dots (QDs) were assembled onto the crystallized TiO2 NWs by sequential chemical bath deposition. Ultraviolet-visible absorption spectra showed that CdS adds bands in the visible to the TiO2 absorption and exhibited a broad absorption band in the visible region, which extended the scope of absorption spectrum and helped improve the photocatalytic degradation efficiency. The results of photocatalytic experiment revealed that CdS-TiO2 NWs possessed higher photocatalytic activities toward methyl orange than pure TiO2 nanowires. The degradation efficiency of 96.32% after ten cycles indicated that the as-prepared CdS-TiO2 composite exhibited excellent long-time recyclable ability and can be reused for the degradation of contaminants.

Keywords:
Hydrothermal; S-CBD; CdS-TiO2 NWs; Photocatalytic activity