Nano Archive

Assembly, characterization, and photocatalytic activities of TiO2 nanotubes/CdS quantum dots nanocomposites

Zhou, Qiang and Fu, Ming-Lai and Yuan, Bao-Ling and Cui, Hao-Jie and Shi, Jian-Wen (2011) Assembly, characterization, and photocatalytic activities of TiO2 nanotubes/CdS quantum dots nanocomposites. Journal of Nanoparticle Research, 13 (12). pp. 6661-6672.

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Abstract

The semiconductor quantum dots (QDs) can be very efficient to tune the response of photocatalyst of TiO2 to visible light. In this study, CdS QDs formed in situ with about 8 nm have been successfully deposited onto the surfaces of TiO2 nanotubes (TNTs) to form TNTs/CdS QDs nanocomposites by use of a simple bifunctional organic linker, thiolactic acid. The diffuse reflectance spectroscopy (DRS) spectra of as prepared samples showed that the absorption edge of the TNTs/CdS composite is extended to visible range, with absorption edge at 530 nm. The photocatalytic activity and stability of TNTs/CdS were also evaluated for the photodegradation of rhodamine B. The results showed that when TNTs/CdS QDs was used, photocatalytic degradation of RhB under visible light irradiation reached 91.6%, higher than 45.4 and 30.5% for P25 and TNTs, respectively. This study indicated that the TNTs/CdS QDs nanocomposites were superior catalysts for photodegradation under visible light irradiation compared with TNTs and P25 samples, which may find wide application as a powerful photocatalyst in environmental field.

Item Type:Article
ID Code:11461
Deposited By:Prof. Alexey Ivanov
Deposited On:05 Jan 2012 09:29
Last Modified:05 Jan 2012 09:42

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