• Synthesis and characterization of visible light absorbing nanosized (1-$x$)KNbO$_{3–x}$(BaNi$_{1/2}$Nb$_{1/2}$O$_{3-{\delta}}$) (x = 0, 0.05, 0.1, 0.15 and 0.2) by solution combustion method and its enhanced photocatalytic activity

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    • Keywords


      KNbO$_3$; KBNNO; solution combustion synthesis; photocatalysis.

    • Abstract


      Nanosized (1–$x$)KNbO$_{3–x}$(BaNi$_{1/2}$Nb$_{1/2}$O$_{3-{\delta}}$) (KBNNO) ($x$ = 0–0.2) powders with an interval of 0.05 were prepared by solution combustion method using citric acid as the fuel. The effect of fuel to oxidizer (F/O) ratio on phase evolution and combustion process was studied and we observed that complete phase formation occurs at 600$^{\circ}$C for ${\varphi}_e$ = 0.55. XRD and Raman analysis confirm that with increase in dopant content, gradual changes occur in phase transition from orthorhombic to cubic. Ba, Ni co-doping made KNbO$_3$, visible light active, which was confirmed byUV–Vis absorption spectra. Photocatalytic experiments show that KBNNO 0.1 exhibited better photocatalytic activity in degrading RhB under visible light irradiation compared to KNbO$_3$ and P25 (commercial TiO$_2$-based photocatalyst). The rate constant of KBNNO 0.1 for RhB degradation is 3.17 and 1.4 times higher than KNbO$_3$ and P25, respectively, under similar visible light illumination. The mechanisms behind photocatalytic activity and photostability have also been studied for the best composition.

    • Author Affiliations



      1. Department of Ceramic Engineering, National Institute of Technology, Rourkela 769008, India
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