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<p>Prussian Blue samples with varying degrees of reduction were synthesized by acidic decomposition of potassium hexacyanoferrate(III), influenced by potassium ferricyanide concentration, polyvinylpyrrolidone, and pH. The obtained materials were characterized using ultraviolet–visible spectrophotometry, scanning electron microscopy, energy-dispersive X-ray spectroscopy, Mössbauer spectroscopy, and X-ray diffraction. The initial hydrogen ionconcentration significantly affected elemental composition and particle size distribution. Nucleation and crystal growth were initiated and controlled by Fe<sup>2</sup>⁺/Fe<sup>3</sup>⁺ species formed through H⁺-induced dissociation reactions. Hexacyanoferrate(III) conversion was proportional to H⁺ depletion. Polyvinylpyrrolidone’s reductive properties, influenced by pH, affected crystal morphology but not initial nucleation or conversion extent. Higher pH led to larger crystals and higher reduction but also decreased conversion of hexacyanoferrate ions. Mössbauer spectroscopy revealed a ferrocyanide vacancy concentration of approximately 5% at pH 1–2. pH 2 was optimal, balancing particle size and vacancy content of ferrocyanide sublattice.</p>

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Synthesis of Prussian blue by acid decomposition of potassium hexacyanoferrate (III) in the presence of polyvinylpyrrolidone

  • 期刊论文

  • 发表日期：

    2026年4月14日

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  • Yulia Chetvertnykh,
  • Boris Ananchenko,
  • Valentin Semenov,
  • Igor Murin,
  • Larisa Gulina

摘要

Prussian Blue samples with varying degrees of reduction were synthesized by acidic decomposition of potassium hexacyanoferrate(III), influenced by potassium ferricyanide concentration, polyvinylpyrrolidone, and pH. The obtained materials were characterized using ultraviolet–visible spectrophotometry, scanning electron microscopy, energy-dispersive X-ray spectroscopy, Mössbauer spectroscopy, and X-ray diffraction. The initial hydrogen ionconcentration significantly affected elemental composition and particle size distribution. Nucleation and crystal growth were initiated and controlled by Fe2⁺/Fe3⁺ species formed through H⁺-induced dissociation reactions. Hexacyanoferrate(III) conversion was proportional to H⁺ depletion. Polyvinylpyrrolidone’s reductive properties, influenced by pH, affected crystal morphology but not initial nucleation or conversion extent. Higher pH led to larger crystals and higher reduction but also decreased conversion of hexacyanoferrate ions. Mössbauer spectroscopy revealed a ferrocyanide vacancy concentration of approximately 5% at pH 1–2. pH 2 was optimal, balancing particle size and vacancy content of ferrocyanide sublattice.