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<p>In this study, Bi<sub>2</sub>₋ₓLaₓWO<sub>6</sub> mixed oxides (x = 0 and 0.3) were successfully synthesized by the ceramic method. The obtained materials were comprehensively characterized using X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, UV–Vis diffuse reflectance spectroscopy (DRS), scanning electron microscopy (SEM), atomic force microscopy (AFM), and photoluminescence (PL) spectroscopy. XRD analysis revealed that partial substitution of Bi<sup>3+</sup> by La<sup>3+</sup> induced a structural transition from the orthorhombic phase of Bi<sub>2</sub>WO<sub>6</sub> to a well-crystallized monoclinic phase in the Bi<sub>1.7</sub>La<sub>0.3</sub>WO<sub>6</sub> sample. This substitution also resulted in a reduction of the average crystallite size. The photocatalytic performance of the synthesized materials was evaluated through the degradation of rhodamine B (RhB) and methyl orange (MO) under visible-light irradiation. The Bi<sub>1.7</sub>La<sub>0.3</sub>WO<sub>6</sub> sample exhibited superior photocatalytic activity, achieving degradation efficiencies of 92.26% for RhB and 92.41% for MO after 120&#xa0;min of irradiation. This enhanced performance is attributed to improved visible-light absorption. Moreover, the photocatalyst retained its high activity over four consecutive cycles, demonstrating excellent stability and reusability. Finally, the photocatalytic degradation mechanism was investigated based on the band structure and radical trapping experiments, revealing that photogenerated holes (h⁺) and hydroxyl radicals (⋅OH) are the dominant reactive species responsible for pollutant degradation.</p> Graphical abstract <p></p>

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Improved visible-light photocatalytic efficiency of Bi1.7La0.3WO6 toward rhodamine B and methyl orange degradation

  • 期刊论文

  • 发表日期：

    2026年7月31日

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  • Hanene Korichi,
  • Nacera Rezak,
  • Chakib Alaoui,
  • Abdellah Bahmani,
  • Hadjer Herir,
  • Nourredine Bettahar

摘要

In this study, Bi2₋ₓLaₓWO6 mixed oxides (x = 0 and 0.3) were successfully synthesized by the ceramic method. The obtained materials were comprehensively characterized using X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, UV–Vis diffuse reflectance spectroscopy (DRS), scanning electron microscopy (SEM), atomic force microscopy (AFM), and photoluminescence (PL) spectroscopy. XRD analysis revealed that partial substitution of Bi3+ by La3+ induced a structural transition from the orthorhombic phase of Bi2WO6 to a well-crystallized monoclinic phase in the Bi1.7La0.3WO6 sample. This substitution also resulted in a reduction of the average crystallite size. The photocatalytic performance of the synthesized materials was evaluated through the degradation of rhodamine B (RhB) and methyl orange (MO) under visible-light irradiation. The Bi1.7La0.3WO6 sample exhibited superior photocatalytic activity, achieving degradation efficiencies of 92.26% for RhB and 92.41% for MO after 120 min of irradiation. This enhanced performance is attributed to improved visible-light absorption. Moreover, the photocatalyst retained its high activity over four consecutive cycles, demonstrating excellent stability and reusability. Finally, the photocatalytic degradation mechanism was investigated based on the band structure and radical trapping experiments, revealing that photogenerated holes (h⁺) and hydroxyl radicals (⋅OH) are the dominant reactive species responsible for pollutant degradation.

Graphical abstract