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Perala Venkataswamy,CH. Sudhakar Reddy,Ravi Gundeboina,Gullapelli Sadanandam,Naveen Kumar Veldurthi,M. Vithal 대한금속·재료학회 2018 ELECTRONIC MATERIALS LETTERS Vol.14 No.4
In this study, the nanostructured parent KTaTeO6(KTTO) and Ag-doped KTaTeO6(ATTO) catalysts with defect pyrochlorestructure were prepared by solid-state and ion-exchange methods, respectively. The synthesized materials were characterizedby various techniques to determine their chemical composition, morphology and microstructural features. The XRD studiesshow that both KTTO and ATTO have cubic structure (space group Fd3m) with high crystallinity. The doping of Ag alteredthe BET surface area of parent KTTO. The nano nature of the samples was studied by TEM images. A considerable redshiftin the absorption edge is observed for ATTO compared to KTTO. Incorporation of Ag+in the KTTO lattice is clearlyidentified from EDX, elemental mapping and XPS results. Degradation of methyl violet and solar water splitting reactionswere used to access the photocatalytic activity of KTTO and ATTO. The results obtained suggest that compared to KTTO,the ATTO showed higher photocatalytic activity in both cases. The favourable properties such as high surface area, moresurface hydroxyl groups, stronger light absorption in visible region and narrower band gap energy were supposed to be thereasons for the high activity observed in ATTO.