• 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

    • Fulltext

       

        Click here to view fulltext PDF


      Permanent link:
      https://www.ias.ac.in/article/fulltext/boms/044/0145

    • 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

       

      S ABHINAY R MAZUMDER1

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

       
    • Supplementary Material

       
  • Bulletin of Materials Science | News

    • Dr Shanti Swarup Bhatnagar for Science and Technology

      Posted on October 12, 2020

      Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
      Chemical Sciences 2020

      Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
      Physical Sciences 2020

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

© 2021-2022 Indian Academy of Sciences, Bengaluru.