期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 509, 期 41, 页码 9791-9797出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2011.07.108
关键词
Niobate; Potassium; Copper doping; Tungsten-bronze structure; Layered perovskite structure; Photocatalysis; Mixed phase; Acid red G
资金
- National Natural Science Foundation of China [50872103]
- National Basic Research Program of China (973 Program) [2007CB613306]
- SRF for ROCS, SEM
Cu-doped KNb(3)O(8) photocatalysts were prepared using a simple solid-state method. The catalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), photoluminescence (PL), X-ray photoelectron spectroscopy (XPS) and UV-vis diffuse reflectance spectrum. XRD and SEM analyses suggest that Cu doping can induce the formation of the compound K(6)Nb(10.8)O(30) with tungsten-bronze structure and the relative content of K(6)Nb(10.8)O(30) in the Cu-doped samples increased with increasing Cu doping amount. When the Cu doping amount reaches 2 wt.%, the as-prepared sample is mainly composed of K(6)Nb(10.8)O(30). The photocatalytic properties of the catalysts were evaluated using the degradation of acid red G. The results showed that Cu-doping significantly increased the photocatalytic activity of the KNb(3)O(8) catalyst. The optimum dopant concentration range of Cu was found to be 0.3-1 wt.%. The synergistic effect of Cu doping and mixed phase niobate compounds is responsible for the enhanced photocatalytic activity. (C) 2011 Elsevier B.V. All rights reserved.
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