Abstract
0.9KNbO3-0.1Ba(Nb1/2Ni1/2)O3-δ (KBNNO) powder was synthesized through one step hydrothermal method at 200 °C. The effect of KOH concentration (1 M-18 M) and the effect of reaction time (30 min-12 h) on phase evolution and powder morphology were investigated. To get maximum perovskite phase atleast 10 M KOH concentration and 12 h soaking time were required. Characterization by X-ray diffraction, Raman spectroscopy, FESEM, TEM and XPS confirms the phase, structure, morphology and composition. The Powder morphology varies from spherical to irregular shape, to rod like nature, to cube shape when KOH concentration of the starting solution in the range of 4-6 M, 8-12 M and 14-18 M, respectively. UV–vis absorption spectroscopy indicates that KBNNO has significant absorption in the visible range compared to that of KNbO3. The photocatalytic degradation of Rhodamine B (RhB) shows an enhanced photocatalytic activity of KBNNO in comparison with KNbO3 synthesized under similar conditions. Finally, a mechanism for the enhanced charge separation and photodegradation is proposed.
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