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<p>Heterophase BiVO<sub>4</sub> nanoparticles&#xa0;synthesized via solution combustion method&#xa0;were&#xa0;annealed at different temperatures. Evolution of crystal structure and variation in phase composition were observed as a function of annealing temperature. These nanophotocatalysts were studied for their efficiency of visible-light active degradation of the most common azo dye Methylene Blue. Annealing resulted in the gradual loss of tetragonal-scheelite phase in the mixed phase (polymorphs tetragonal-scheelite and monoclinic-scheelite) and emergence of single phase (monoclinic-scheelite) at a threshold of 500&#xa0;°C. The dye degradation efficiency progressively decreased for the annealed samples, despite the increase in abundance of highly photocatalytic monoclinic-scheelite phase. Such a behaviour is attributed to four contributing factors: (i) the decrement in overall nitrogen-carbon coating, (ii) progressive loss of the isotype heterojunction between the polymorphs, and (iii) increase in particle size; which (iv) counteract and dominate the increment in efficiency due to increase in the amount of monoclinic scheelite phase.</p> Graphical abstract <p></p>

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Annealing temperature dependent phase evolution in heterophasic bismuth vanadate and the effect of isotype-heterojunction on the white light active degradation of methylene blue

  • 期刊论文

  • 发表日期：

    2025年8月20日

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  • Raj Laxmi,
  • Sachin Kulkarni,
  • Venkatesh Burudi,
  • A V Anupama,
  • Mahipal Ranot

摘要

Heterophase BiVO4 nanoparticles synthesized via solution combustion method were annealed at different temperatures. Evolution of crystal structure and variation in phase composition were observed as a function of annealing temperature. These nanophotocatalysts were studied for their efficiency of visible-light active degradation of the most common azo dye Methylene Blue. Annealing resulted in the gradual loss of tetragonal-scheelite phase in the mixed phase (polymorphs tetragonal-scheelite and monoclinic-scheelite) and emergence of single phase (monoclinic-scheelite) at a threshold of 500 °C. The dye degradation efficiency progressively decreased for the annealed samples, despite the increase in abundance of highly photocatalytic monoclinic-scheelite phase. Such a behaviour is attributed to four contributing factors: (i) the decrement in overall nitrogen-carbon coating, (ii) progressive loss of the isotype heterojunction between the polymorphs, and (iii) increase in particle size; which (iv) counteract and dominate the increment in efficiency due to increase in the amount of monoclinic scheelite phase.

Graphical abstract