Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 618, Issue -, Pages 815-823Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2014.08.157
Keywords
Defect pyrochlore; Visible light; Bandgap energy; Photodegradation; (OH)-O-center dot radicals
Categories
Funding
- Council of Scientific and Industrial Research (CSIR) New Delhi
Ask authors/readers for more resources
Quaternary oxides containing transition metal and tungsten with the general formula AMWO(6) (A = K, Rb, Cs; M= Sb, Nb, Ti) have been studied as photocatalysts for decomposition of organic dyes. In this paper, defect pyrochlore of composition KTi0.5W1.5O6 was prepared via facile sol-gel method. Its nitrogen and tin doped analogues were prepared by solid state and ion exchange methods respectively. All compounds were characterized by powder X-ray diffraction, Thermogravimetric analysis, FT-IR, Raman, Scanning electron microscopy and UV-Vis diffuse reflectance spectra. X-ray photoelectron spectroscopy and energy dispersive spectroscopy were also used to characterize the incorporation of doped ions into the defect pyrochlore lattice. The photocatalytic activity of all compounds was studied by degradation of methylene blue and Rhodamine B. The tin doped KTi0.5W1.5O6 shows higher photocatalytic activity against both the dyes. The experimental results show that the higher photocatalytic activity of tin doped KTi0.5W1.5O6 is due to more absorption of light energy in the visible region attributable to the lowering of bandgap energy. Further, the role of reactive intermediate species in the photocatalytic degradation of dyes was studied using their appropriate scavengers and the obtained results show that (OH)-O-center dot radicals produced in the photocatalytic reaction play dominant role. (C) 2014 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available