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Issue 37, 2013
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Hierarchically grown CdS/α-Fe2O3 heterojunction nanocomposites with enhanced visible-light-driven photocatalytic performance

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Abstract

Wide spectral responsive 3D hierarchical CdS/α-Fe2O3 heterojunction nanocomposites were synthesized through a facile chemical bath method under mild conditions, and used for the reduction of Cr(VI) into Cr(III) under visible light irradiation. The effects of CdS/α-Fe2O3 molar ratio in the nanocomposites on the crystal phases, microstructures, optical absorption properties, and photocatalytic reduction of Cr(VI) were investigated comparatively. It was found that the as-synthesized CdS/α-Fe2O3 nanocomposites with a suitable CdS content (e.g., the molar ratio of Fe : Cd = 1.25 : 3) had not only high visible-light-driven photocatalytic activity in the Cr(VI) reduction, but also good photocatalytic stability. The enhanced photocatalytic activity can be ascribed to some CdS nanoparticles closely contacting the α-Fe2O3 microflowers to form a heterojunction structure. These tight heterojunctions of the photocatalysts result in an efficient electron–hole pairs separation at the interface, followed by fast diffusion of photogenerated charge between CdS and α-Fe2O3, which is beneficial for separating the photogenerated carriers in space and improving the photocatalytic activity.

Graphical abstract: Hierarchically grown CdS/α-Fe2O3 heterojunction nanocomposites with enhanced visible-light-driven photocatalytic performance

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Supplementary files

Article information


Submitted
05 Jun 2013
Accepted
01 Jul 2013
First published
01 Jul 2013

Dalton Trans., 2013,42, 13417-13424
Article type
Paper

Hierarchically grown CdS/α-Fe2O3 heterojunction nanocomposites with enhanced visible-light-driven photocatalytic performance

S. Zhang, W. Xu, M. Zeng, J. Li, J. Xu and X. Wang, Dalton Trans., 2013, 42, 13417
DOI: 10.1039/C3DT51492G

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