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<p>In this work, we have employed for the first time the synthesis of both alpha-silver tungstate (α-Ag<sub>2</sub>WO<sub>4</sub>) and beta-silver tungstate (β-Ag<sub>2</sub>WO<sub>4</sub>) crystals by a facile one-pot precipitation method and investigated their morphological, optical, and photocatalytic properties at room temperature. The synthesis method made obtaining both the mixture of the phases α-β-Ag<sub>2</sub>WO<sub>4</sub>/β-Ag<sub>2</sub>WO<sub>4</sub> crystals in the precipitate materials (AW2) and supernatant possible of the α-Ag<sub>2</sub>WO<sub>4</sub> phase (AW1). The X-ray diffraction (XRD) patterns and Rietveld refinement show that in precipitate sample (AW2) there is a mixture of β-Ag<sub>2</sub>WO<sub>4</sub> (73.30%), with hexagonal structure, and α-Ag<sub>2</sub>WO<sub>4</sub> (26.70%), with orthorhombic structure, while those contained in supernatant show only α-Ag<sub>2</sub>WO<sub>4</sub> crystals. Field emission scanning electron microscopy (FE-SEM) images confirms that β-Ag<sub>2</sub>WO<sub>4</sub> crystals show rod morphology with an average height distribution in the range of 15&#xa0;μm and a width distribution in the range of 2&#xa0;μm, while the α-Ag<sub>2</sub>WO<sub>4</sub> crystals show cuboid shape with an average edge length of approximately 200&#xa0;nm. Both structures showed an optical band gap energy of approximately 2.90&#xa0;eV. Finally, the mixture having AW2 was more effective (72% yield and k<sub>app</sub> of 4.18 × 10<sup>−3</sup>&#xa0;min<sup>−1</sup>) for the photocatalytic degradation of RhB dye than AW1 sample (40% yield and k<sub>app</sub> of 1.28 × 10<sup>−3</sup>&#xa0;min<sup>−1</sup>).</p> Graphical abstract <p></p>

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Morphological, optical, and photocatalytic properties of both α-Ag2WO4 and β-Ag2WO4 crystals synthesized by a facile one-pot precipitation synthesis method

  • 期刊论文

  • 发表日期：

    2025年10月6日

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  • Germano P. Santos,
  • Francisco C. M. Silva,
  • João F. Cruz-Filho,
  • Antônio F. Soares Filho,
  • Gleison A. Rodrigues,
  • Francisco E. P. Santos,
  • Roberto A. S. Luz,
  • Geraldo E. Luz Jr.

摘要

In this work, we have employed for the first time the synthesis of both alpha-silver tungstate (α-Ag2WO4) and beta-silver tungstate (β-Ag2WO4) crystals by a facile one-pot precipitation method and investigated their morphological, optical, and photocatalytic properties at room temperature. The synthesis method made obtaining both the mixture of the phases α-β-Ag2WO4/β-Ag2WO4 crystals in the precipitate materials (AW2) and supernatant possible of the α-Ag2WO4 phase (AW1). The X-ray diffraction (XRD) patterns and Rietveld refinement show that in precipitate sample (AW2) there is a mixture of β-Ag2WO4 (73.30%), with hexagonal structure, and α-Ag2WO4 (26.70%), with orthorhombic structure, while those contained in supernatant show only α-Ag2WO4 crystals. Field emission scanning electron microscopy (FE-SEM) images confirms that β-Ag2WO4 crystals show rod morphology with an average height distribution in the range of 15 μm and a width distribution in the range of 2 μm, while the α-Ag2WO4 crystals show cuboid shape with an average edge length of approximately 200 nm. Both structures showed an optical band gap energy of approximately 2.90 eV. Finally, the mixture having AW2 was more effective (72% yield and kapp of 4.18 × 10−3 min−1) for the photocatalytic degradation of RhB dye than AW1 sample (40% yield and kapp of 1.28 × 10−3 min−1).

Graphical abstract