4.4 Article

Synthesis, characterisation and photocatalytic activity of Ag+- and Sn2+-substituted KSbTeO6

Journal

CHEMICAL PAPERS
Volume 69, Issue 2, Pages 269-278

Publisher

SPRINGER INT PUBL AG
DOI: 10.1515/chempap-2015-0013

Keywords

defect pyrochlore; X-ray diffraction; Raman spectroscopy; photodegradation

Funding

  1. Department of Science & Technology (DST), New Delhi under FIST
  2. University Grants Commission (UGC), New Delhi under the UPE-FAR
  3. CSIR, New Delhi

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Ag+- and Sn2+-substituted KSbTeO6 were prepared by a facile ion-exchange method at ambient temperature. All the samples were characterised by scanning electron microscopy, energy-dispersive spectra, thermogravimetric analysis, powder X-ray diffraction, Raman spectra and UV-VIS diffuse reflectance spectra. Both Sn2+- and Ag+-substituted KSbTeO6 were crystallised in a cubic lattice with the Fd (3) over barm space group. The band-gap energy of all the samples was deduced from their UV-VIS diffuse reflectance spectral profiles. The visible light-induced photocatalytic oxidation of the methylene blue (MB) dye was examined in the presence of all the as-prepared materials. The Ag+- and Sn2+-substituted KSbTeO6 exhibited a higher photocatalytic activity than the parent KSbTeO6 in degradation of the MB dye under visible light irradiation. (C) 2014 Institute of Chemistry, Slovak Academy of Sciences

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