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<p>Photocatalysis serves as an effective and environmentally friendly approach for the treatment of wastewater and water, with ZnO-based photocatalysts exhibiting significant efficacy in this area. Consequently, we present a novel method that integrates solvothermal, calcination, and hydrothermal processes to produce a ZnO/Bi<sub>2</sub>MoO<sub>6</sub>/AgFeO<sub>2</sub> ternary photocatalyst, which has shown a remarkable photocatalytic activity in eliminating methyl orange (MO), rhodamine B (RhB), and methylene blue (MB) when exposed to persulfate (SO<sub>5</sub><sup>2</sup>⁻) under visible light. The ZnO/Bi<sub>2</sub>MoO<sub>6</sub>/AgFeO<sub>2</sub> photocatalysts facilitate the activation of SO<sub>5</sub><sup>2</sup>⁻ ions, thereby enhancing the degradation of pollutants under visible light exposure. In the presence of the ZnO/Bi<sub>2</sub>MoO<sub>6</sub>/AgFeO<sub>2</sub> (20%)/SO<sub>5</sub><sup>2</sup>⁻ system, MB was entirely decomposed within 75&#xa0;min, whereas only 39.8% of MB was eliminated using the ZnO/Bi<sub>2</sub>MoO<sub>6</sub>/AgFeO<sub>2</sub> (20%) sample without SO<sub>5</sub><sup>2</sup>⁻. This indicates a synergistic effect between SO<sub>5</sub><sup>2</sup>⁻ activation and visible-light photocatalysis in the ZnO/Bi<sub>2</sub>MoO<sub>6</sub>/AgFeO<sub>2</sub> (20%) system. The enhanced photocatalytic performance of this system is attributed to the activation of SO5<sup>2</sup>⁻ ions by electrons, leading to the generation of sulfate radicals (<sup>⦁</sup>SO<sub>4</sub>⁻), improved charge carrier separation, and increased visible light absorption by Bi<sub>2</sub>MoO<sub>6</sub> and AgFeO<sub>2</sub>. Ultimately, the proposed mechanism for the significantly enhanced photocatalytic activities involves multiple Z-scheme/type II heterojunctions. The findings of this study confirm that the ZnO/Bi<sub>2</sub>MoO<sub>6</sub>/AgFeO<sub>2</sub> system is a viable visible-light-driven nanocomposite for the purification of water and wastewater.</p>

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Novel Z-Scheme/Type-II ZnO/Bi2MoO6/AgFeO2 Ternary Heterojunctions for Persulfate-Assisted Photocatalytic Elimination of Several Dyes Exposure to Visible Light

  • 期刊论文

  • 发表日期：

    2025年8月5日

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  • Behrouz Golzad-Nonakaran,
  • Seyed Masoud Seyed Ahmadian,
  • Mohammad Ghorbanpour,
  • Ali Reza Amani-Ghadim

摘要

Photocatalysis serves as an effective and environmentally friendly approach for the treatment of wastewater and water, with ZnO-based photocatalysts exhibiting significant efficacy in this area. Consequently, we present a novel method that integrates solvothermal, calcination, and hydrothermal processes to produce a ZnO/Bi2MoO6/AgFeO2 ternary photocatalyst, which has shown a remarkable photocatalytic activity in eliminating methyl orange (MO), rhodamine B (RhB), and methylene blue (MB) when exposed to persulfate (SO52⁻) under visible light. The ZnO/Bi2MoO6/AgFeO2 photocatalysts facilitate the activation of SO52⁻ ions, thereby enhancing the degradation of pollutants under visible light exposure. In the presence of the ZnO/Bi2MoO6/AgFeO2 (20%)/SO52⁻ system, MB was entirely decomposed within 75 min, whereas only 39.8% of MB was eliminated using the ZnO/Bi2MoO6/AgFeO2 (20%) sample without SO52⁻. This indicates a synergistic effect between SO52⁻ activation and visible-light photocatalysis in the ZnO/Bi2MoO6/AgFeO2 (20%) system. The enhanced photocatalytic performance of this system is attributed to the activation of SO52⁻ ions by electrons, leading to the generation of sulfate radicals (⦁SO4⁻), improved charge carrier separation, and increased visible light absorption by Bi2MoO6 and AgFeO2. Ultimately, the proposed mechanism for the significantly enhanced photocatalytic activities involves multiple Z-scheme/type II heterojunctions. The findings of this study confirm that the ZnO/Bi2MoO6/AgFeO2 system is a viable visible-light-driven nanocomposite for the purification of water and wastewater.