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<p>Developing solar-light-responsive photocatalysts attracted exciting prospects in the energy and environmental sectors. This study focuses on coating CuBi<sub>2</sub>O<sub>4</sub> nanorods with Ag<sub>2</sub>CrO<sub>4</sub> shell to yield robust S-scheme CuBi<sub>2</sub>O<sub>4</sub>/Ag<sub>2</sub>CrO<sub>4</sub> composites with a core-shell heterostructure. The CuBi<sub>2</sub>O<sub>4</sub>/Ag<sub>2</sub>CrO<sub>4</sub> photocatalyst exhibited boosted charge separation behavior and upgraded surface area, reflecting beneficial impacts on the catalytic capacity. Under visible light (117&#xa0;W-LED) irradiation, CuBi<sub>2</sub>O<sub>4</sub>/Ag<sub>2</sub>CrO<sub>4</sub> could enhance the methylene blue (MB) and Congo red (CR) degradation by exhibiting 75% and 85% of removal efficiency within 75&#xa0;min, respectively. The optimized CuBi<sub>2</sub>O<sub>4</sub>/Ag<sub>2</sub>CrO<sub>4</sub>-25% recorded the best MB degradation kinetics (0.01918&#xa0;min⁻¹), surpassing pure CuBi<sub>2</sub>O<sub>4</sub> (0.00739&#xa0;min⁻¹) and Ag<sub>2</sub>CrO<sub>4</sub> (0.00910&#xa0;min⁻¹) by factors of 2.59 and 2.11, respectively. Besides, the MB degradation over CuBi<sub>2</sub>O<sub>4</sub>/Ag<sub>2</sub>CrO<sub>4</sub>-25% was evaluated based on catalyst dosage, reaction temperature, and MB concentration. Besides, the S-type reaction mechanism demonstrated the improved light absorption, accelerated charge dynamics, hampered recombination rate, and strengthened redox potential. The trapping results indicated the key influence of <sup>•</sup>O<sub>2</sub><sup>−</sup> and h<sup>+</sup> and the auxiliary efforts of <sup>•</sup>OH in the catalytic reaction. Finally, our innovative photocatalyst encourages the harvesting of low-energy LED light and offers cost-effective remediation processes for environmental issues.</p>

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Economic Photocatalytic Degradation of Environmental Pollutants Over CuBi2O4/Ag2CrO4 Photocatalyst with Core-Shell Heterostructure: S-Scheme Mechanism

  • 期刊论文

  • 发表日期：

    2025年4月5日

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  • Zaid H. Jabbar,
  • Bassim H. Graimed,
  • Ayah A. Okab,
  • Huda S. Merdas,
  • Ahmed Makki Al-Sulaiman,
  • Ali Majdi

摘要

Developing solar-light-responsive photocatalysts attracted exciting prospects in the energy and environmental sectors. This study focuses on coating CuBi2O4 nanorods with Ag2CrO4 shell to yield robust S-scheme CuBi2O4/Ag2CrO4 composites with a core-shell heterostructure. The CuBi2O4/Ag2CrO4 photocatalyst exhibited boosted charge separation behavior and upgraded surface area, reflecting beneficial impacts on the catalytic capacity. Under visible light (117 W-LED) irradiation, CuBi2O4/Ag2CrO4 could enhance the methylene blue (MB) and Congo red (CR) degradation by exhibiting 75% and 85% of removal efficiency within 75 min, respectively. The optimized CuBi2O4/Ag2CrO4-25% recorded the best MB degradation kinetics (0.01918 min⁻¹), surpassing pure CuBi2O4 (0.00739 min⁻¹) and Ag2CrO4 (0.00910 min⁻¹) by factors of 2.59 and 2.11, respectively. Besides, the MB degradation over CuBi2O4/Ag2CrO4-25% was evaluated based on catalyst dosage, reaction temperature, and MB concentration. Besides, the S-type reaction mechanism demonstrated the improved light absorption, accelerated charge dynamics, hampered recombination rate, and strengthened redox potential. The trapping results indicated the key influence of •O2− and h+ and the auxiliary efforts of •OH in the catalytic reaction. Finally, our innovative photocatalyst encourages the harvesting of low-energy LED light and offers cost-effective remediation processes for environmental issues.