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<p>Bismuth-based structures are recognized as active photocatalysts against emerging contaminants such as organic dyes. However, the pure form of semiconductors needs modification to improve characteristics such as photo reactivity and catalytic performance. In this context, a novel heterojunction comprising BiOI, amine-functionalized reduced graphene oxide (rGO), and Ag<sub>3</sub>PO<sub>4</sub> was prepared which led to a reduction in energy bandgap and electron–hole recombination rate. Additionally, amine functionalization enhances catalytic performance of ArGO@BiOI photocatalyst against rhodamine B (RhB). The photocatalytic performance of BiOI, ArGO@BiOI, and ArGO@BiOI@Ag<sub>3</sub>PO<sub>4</sub> composites for RhB was observed to be 92.25, 92.57, and 99.40% after 35&#xa0;min, respectively. Optimizing RhB removal process by response surface methodology (RSM), indicated that the highest removal of ~ 99% was achieved at a catalyst dose = 620&#xa0;mg/L, pH = 5.4, RhB = 5&#xa0;mg/L, and irradiation time = 35&#xa0;min. The catalytic performance was demonstrated on real water matrix samples, which revealed a significant removal of 89.76%- 98.29%. The kinetics of RhB abatement obeyed the first-order model, where the rate constant increases as the dye level decrease (0.074–0.114&#xa0;min<sup>−1</sup>). Furthermore, the rate constant of first-order kinetic model under sunlight was ~ 7.5 times faster than LED light. Radical trapping tests indicated the vital role of electrons in RhB removal process. ArGO@BiOI@Ag<sub>3</sub>PO<sub>4</sub> maintained its photocatalytic efficiency over four cycles, with dye removal observed in the range of 99.40–71.4%.</p>

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Amine functionalized reduced graphene oxide decorated with BiOI and Ag3PO4 as a Novel Visible Light catalyst against RhB

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年10月28日

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  • Somayeh Rahdar,
  • Mojtaba Davoudi,
  • Najmaldin Ezaldin Hassan,
  • Sonia Fathi-karkan,
  • Fatemeh Barjasteh Askari,
  • Mahmoud Shams,
  • Ali Akbar Mohammadi

摘要

Bismuth-based structures are recognized as active photocatalysts against emerging contaminants such as organic dyes. However, the pure form of semiconductors needs modification to improve characteristics such as photo reactivity and catalytic performance. In this context, a novel heterojunction comprising BiOI, amine-functionalized reduced graphene oxide (rGO), and Ag3PO4 was prepared which led to a reduction in energy bandgap and electron–hole recombination rate. Additionally, amine functionalization enhances catalytic performance of ArGO@BiOI photocatalyst against rhodamine B (RhB). The photocatalytic performance of BiOI, ArGO@BiOI, and ArGO@BiOI@Ag3PO4 composites for RhB was observed to be 92.25, 92.57, and 99.40% after 35 min, respectively. Optimizing RhB removal process by response surface methodology (RSM), indicated that the highest removal of ~ 99% was achieved at a catalyst dose = 620 mg/L, pH = 5.4, RhB = 5 mg/L, and irradiation time = 35 min. The catalytic performance was demonstrated on real water matrix samples, which revealed a significant removal of 89.76%- 98.29%. The kinetics of RhB abatement obeyed the first-order model, where the rate constant increases as the dye level decrease (0.074–0.114 min−1). Furthermore, the rate constant of first-order kinetic model under sunlight was ~ 7.5 times faster than LED light. Radical trapping tests indicated the vital role of electrons in RhB removal process. ArGO@BiOI@Ag3PO4 maintained its photocatalytic efficiency over four cycles, with dye removal observed in the range of 99.40–71.4%.