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<p>This research describes the synthesis and evaluation of a series of TmVO₄/g-C₃N₄ heterostructured photocatalyst systems for the visible light catalysis of organic dye degradation in aqueous solutions. Characterization of the structural and morphological properties suggests that successful coupling of TmVO₄ and g-C₃N₄ formed direct heterojunction interfaces, while characterization of the optical properties suggests enhanced visible light absorption and reduced charge recombination via the formation of the TmVO₄ and g-C₃N₄ composites (heterostructures). Among the TmVO₄/g-C₃N₄ composites analyzed in this work, the optimized composite exhibited the greatest photocatalytic activity for the visible-light photocatalytic degradation of Rhodamine B (RhB) dye, with degradation efficiencies of 95.5% after 90&#xa0;min of irradiation, significantly greater than the activity obtained using either pure g-C₃N₄ or TmVO₄. A kinetic study showed that the degradation of RhB follows a pseudo–first–order Langmuir–Hinshelwood model with an apparent rate constant of 0.031&#xa0;min⁻¹, representing an increase of 3.8 times compared to g-C₃N₄. Trapping reaction experiments demonstrated that superoxide radical (•O₂⁻) reaction species produced in the photocatalytic system dominated the photocatalytic process, while the contributions from the photogenerated hole and hydroxyl radical to the overall rate of the photocatalytic degradation of RhB were negligible. After five consecutive photocatalytic cycles, the degradation efficiency remained at 88.3%, indicating good stability of the photocatalyst. Considering the data and the proposed energy band structure, a possible charge-transfer mechanism (Type-I heterojunction) is proposed to explain the enhanced photocatalytic activities observed for the TmVO₄/g-C₃N₄ systems. The results of this work demonstrate the useful practical advantages that result from using TmVO₄/g-C₃N₄ photocatalytic systems in the visible light catalysis of organic dye degradation in wastewater.</p>

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TmVO4/g-C3N4 nanocomposite for photodegradation of organic dyes in water mediums

  • 期刊论文

  • 发表日期：

    2026年7月10日

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  • Magda H. Abdellattif,
  • Jayanti Makasana,
  • Soumya V Menon,
  • Ali Fawzi Al-Hussainy,
  • Abhayveer Singh,
  • Kavitha V.,
  • Rajashree Panigrahi,
  • Naveen Chandra Talniya

摘要

This research describes the synthesis and evaluation of a series of TmVO₄/g-C₃N₄ heterostructured photocatalyst systems for the visible light catalysis of organic dye degradation in aqueous solutions. Characterization of the structural and morphological properties suggests that successful coupling of TmVO₄ and g-C₃N₄ formed direct heterojunction interfaces, while characterization of the optical properties suggests enhanced visible light absorption and reduced charge recombination via the formation of the TmVO₄ and g-C₃N₄ composites (heterostructures). Among the TmVO₄/g-C₃N₄ composites analyzed in this work, the optimized composite exhibited the greatest photocatalytic activity for the visible-light photocatalytic degradation of Rhodamine B (RhB) dye, with degradation efficiencies of 95.5% after 90 min of irradiation, significantly greater than the activity obtained using either pure g-C₃N₄ or TmVO₄. A kinetic study showed that the degradation of RhB follows a pseudo–first–order Langmuir–Hinshelwood model with an apparent rate constant of 0.031 min⁻¹, representing an increase of 3.8 times compared to g-C₃N₄. Trapping reaction experiments demonstrated that superoxide radical (•O₂⁻) reaction species produced in the photocatalytic system dominated the photocatalytic process, while the contributions from the photogenerated hole and hydroxyl radical to the overall rate of the photocatalytic degradation of RhB were negligible. After five consecutive photocatalytic cycles, the degradation efficiency remained at 88.3%, indicating good stability of the photocatalyst. Considering the data and the proposed energy band structure, a possible charge-transfer mechanism (Type-I heterojunction) is proposed to explain the enhanced photocatalytic activities observed for the TmVO₄/g-C₃N₄ systems. The results of this work demonstrate the useful practical advantages that result from using TmVO₄/g-C₃N₄ photocatalytic systems in the visible light catalysis of organic dye degradation in wastewater.