Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 138, Issue -, Pages 184-190Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2013.02.031
Keywords
CuSe-ZnSe nanocomposites; Ion-exchange reaction; Visible-light-driven; Photocatalytic activities; Organic dyes
Funding
- National Natural Science Foundation of China [21001086, 21276116]
- Postgraduate Research Foundation of Jiangsu Province [1102123C]
- National Postgraduate Research Foundation of China [2011M500853]
- Science Department of Jiangsu Province [BK2010340]
- Jiangsu University [10JDG070]
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CuSe-ZnSe flower-like nanocomposites with uniform diameters can be easily fabricated on a large scale by a controlled ion-exchange reaction between monodisperse ZnSe flower-like nanostructures and Cu2+ ions in solution. The difference of solubility products (K-sp) of ZnSe and CuSe is the main driving force for the formation of these flower-like nanocomposites. The Cu content greatly influences the physical properties and photocatalytic activity of obtained CuSe-ZnSe nanocomposites. The as-produced CuSe-ZnSe nanocomposites show tremendous enhancements on the photocatalytic degradation ratio of organic dyes methylene orange (MO) and methylene blue (MB) under visible-light irradiation. The 8 wt.% CuSe-ZnSe sample exhibits the highest degradation ratio for both MO (ca. 100%, 90 min) and MB (ca. 96%, 60 min), which are over 4 times and 2.5 times than that of the pure ZnSe sample, respectively. Based on the data of UV-vis diffuse reflection spectra, XPS and PL spectra, the enhancements of photocatalytic activities of CuSe-ZnSe flower-like nanocomposites are due to the effective separation of photo-electrons and holes induces by the direct initiates interfacial charge transfer (IFCT) from the valence band (VB) of ZnSe to CuSe, which results in the reduction of CuSe to Cu2Se. This work not only highlights the potential use of visible-light-driven CuSe-ZnSe flower-like nanocomposites photocatalysts, but also emphasizes the simple ion-exchange in situ growth method for the preparation of selenides heterogeneous structures. (C) 2013 Elsevier B.V. All rights reserved.
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