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<p>In this study, a Sr-doped BiVO<sub>4</sub>/g-C<sub>3</sub>N<sub>4</sub> (Sr@BiVO<sub>4</sub>/g-C<sub>3</sub>N<sub>4</sub>) heterojunction photocatalyst was successfully synthesized through a facile hydrothermal-assisted thermal treatment route. X-ray diffraction (XRD) analysis confirmed the successful incorporation of Sr<sup>2+</sup> ions into the BiVO<sub>4</sub> lattice, resulting in slight lattice distortion and improved crystallinity. Fourier-transform infrared (FTIR) and UV-Vis diffuse reflectance spectroscopy (DRS) analyses revealed strong interfacial coupling between BiVO<sub>4</sub> and g-C<sub>3</sub>N<sub>4</sub>, along with a noticeable red shift in the absorption edge, leading to a reduced band gap of 2.17&#xa0;eV. The synergistic effect of Sr doping and heterojunction formation significantly enhanced charge separation efficiency. The optimized Sr-BiVO<sub>4</sub>/g-C<sub>3</sub>N<sub>4</sub> photocatalyst exhibited remarkable photocatalytic performance, achieving up to 99% degradation of crystal violet (CV) dye within 120&#xa0;min under natural sunlight, outperforming pristine BiVO<sub>4</sub> and its individual components. The superior activity can be attributed to the combined effects of Sr doping, which improves the electronic structure and visible-light absorption, and the formation of a g-C<sub>3</sub>N<sub>4</sub> based heterojunction, which promotes efficient charge transfer and suppresses electron–hole recombination. Overall, this study presents a simple and effective strategy for developing cost-efficient, solar-driven photocatalysts for environmental remediation applications.</p>

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Enhanced solar light driven remediation of toxic dye contaminated water using strontium doped BiVO4/gC3N4 with mechanistic insights and kinetic evaluation

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年1月24日

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  • Prafulla Kumar Panda,
  • Rasmirekha Pattanaik,
  • Debapriya Pradhan,
  • Rishabh Kamal,
  • Suresh Kumar Dash

摘要

In this study, a Sr-doped BiVO4/g-C3N4 (Sr@BiVO4/g-C3N4) heterojunction photocatalyst was successfully synthesized through a facile hydrothermal-assisted thermal treatment route. X-ray diffraction (XRD) analysis confirmed the successful incorporation of Sr2+ ions into the BiVO4 lattice, resulting in slight lattice distortion and improved crystallinity. Fourier-transform infrared (FTIR) and UV-Vis diffuse reflectance spectroscopy (DRS) analyses revealed strong interfacial coupling between BiVO4 and g-C3N4, along with a noticeable red shift in the absorption edge, leading to a reduced band gap of 2.17 eV. The synergistic effect of Sr doping and heterojunction formation significantly enhanced charge separation efficiency. The optimized Sr-BiVO4/g-C3N4 photocatalyst exhibited remarkable photocatalytic performance, achieving up to 99% degradation of crystal violet (CV) dye within 120 min under natural sunlight, outperforming pristine BiVO4 and its individual components. The superior activity can be attributed to the combined effects of Sr doping, which improves the electronic structure and visible-light absorption, and the formation of a g-C3N4 based heterojunction, which promotes efficient charge transfer and suppresses electron–hole recombination. Overall, this study presents a simple and effective strategy for developing cost-efficient, solar-driven photocatalysts for environmental remediation applications.