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 15.09.2008   Карта сайта     Language По-русски По-английски
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15.09.2008

Wet chemical synthesis and photocatalytic activity of potassium niobate K6Nb10.8O30 powders




Gaoke ZhangCorresponding Author Contact Information, a, E-mail The Corresponding Author, Yanjun Hua, Xinmiao Dinga, Jin Zhoua and Junwei Xiea





aSchool of Resources and Environmental Engineering, Wuhan University of Technology, Luoshi Road 122, Wuhan 430070, PR China




Received 14 August 2007; 


revised 29 January 2008; 


accepted 29 April 2008. 


Available online 8 May 2008.








Abstract


The nanometer potassium niobate powders with tungsten bronze (TB)-type structure were synthesized by a wet chemical method and characterized by X-ray diffraction (XRD) and field emission scanning electron microscope (FESEM). X-ray photoelectron spectroscopy (XPS) analysis confirmed the niobium with mixed valence states exists in the crystal structure of the photocatalyst, which may be advantage for increasing the photocatalytic activity. The band gap of K6Nb10.8O30 powders was estimated to be about 2.92 eV and shows a markedly blue-shift as compared to that of the sample obtained by the solid-state reaction. The photocatalytic activity of the samples was evaluated by degradation of acid red G under UV irradiation and the photocatalytic reaction follows first-order kinetics. The photocatalytic activity of the as-prepared sample is much higher than that of sample synthesized by solid-state reaction, and slightly higher than that of P25-TiO2.





Graphical abstract


The K6Nb10.8O30 powders with TB-type structure were synthesized by a wet chemical method at lower temperature. The particle size of the as-prepared powders is much smaller than that of the sample by obtained solid-state method and its photocatalytic activity is much higher than that of the latter and slightly higher than that of P25-TiO2.


Full-size image



Keywords: K6Nb10.8O30; Niobate; Tungsten bronze structure; Wet chemical synthesis; Photocatalytic activity; Acid red G





Article Outline



1. Introduction
2. Experimental

2.1. Synthesis of the photocatalysts
2.2. Photocatalytic experiments

3. Results and discussion

3.1. XRD patterns analysis
3.2. SEM analysis
3.3. XPS analysis
3.4. UV–Vis diffuse reflectance spectrum
3.5. Photocatalytic activity of photocatalysts

4. Conclusion
Acknowledgements
References







































Journal of Solid State Chemistry
Volume 181, Issue 9, September 2008, Pages 2133-2138


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  • Chen Wev .  honorary member of ISSC science council

  • Harton Vladislav Vadim  honorary member of ISSC science council

  • Lichtenstain Alexandr Iosif  honorary member of ISSC science council

  • Novikov Dimirtii Leonid  honorary member of ISSC science council

  • Yakushev Mikhail Vasilii  honorary member of ISSC science council

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