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<p>This study investigates the effectiveness of BiOCl/C-doped TiO<sub>2</sub> (BOC/C-TO) heterostructures for the photocatalytic degradation of Congo Red (CR) in aqueous solutions under irradiation of visible light. The heterojunction composite was synthesized using hydrothermal method, with varying ratios of BiOCl loaded onto the surface of C-doped TiO<sub>2</sub>. The optimized 10%BOC/C-TO sample demonstrated the highest degradation efficiency (96.84%) for CR (100&#xa0;mg/L) within 90&#xa0;min, exhibiting a higher photocatalytic activity about 2.17, 8.12, and 2.04 times greater than C-TO, BOC, and the physical mixing sample (C-TO + BOC), respectively. The enhanced photocatalytic performance was attributed to improved light absorption due to the carbon doping, the effective charge separation resulting from the construction of suitable heterojunction, and the dye-sensitization. Additionally, scavenging tests were conducted to examine the role of reactive species, and the results showed that capturing hydroxyl radicals caused a 59.81% drop in photoactivity, indicating their crucial role in the process. Furthermore, over six photocatalytic reaction cycles, 10%BOC/C-TO composite maintained stable performance without notable decline in efficiency. The composite also demonstrated a high capacity for degrading various types of dyes under the same conditions. These findings provide valuable insights for designing new heterogeneous photocatalysts and advancing their applications in environmental protection.</p>

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Design of BiOCl/C-doped TiO2 Hybrid Heterojunctions for Promoted Visible Light-Driven Photocatalytic Decomposition of Dyes

  • 期刊论文

  • 发表日期：

    2026年3月24日

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  • Lamees R. Jabbar,
  • Saad H. Ammar,
  • Ali Akbar Amooey

摘要

This study investigates the effectiveness of BiOCl/C-doped TiO2 (BOC/C-TO) heterostructures for the photocatalytic degradation of Congo Red (CR) in aqueous solutions under irradiation of visible light. The heterojunction composite was synthesized using hydrothermal method, with varying ratios of BiOCl loaded onto the surface of C-doped TiO2. The optimized 10%BOC/C-TO sample demonstrated the highest degradation efficiency (96.84%) for CR (100 mg/L) within 90 min, exhibiting a higher photocatalytic activity about 2.17, 8.12, and 2.04 times greater than C-TO, BOC, and the physical mixing sample (C-TO + BOC), respectively. The enhanced photocatalytic performance was attributed to improved light absorption due to the carbon doping, the effective charge separation resulting from the construction of suitable heterojunction, and the dye-sensitization. Additionally, scavenging tests were conducted to examine the role of reactive species, and the results showed that capturing hydroxyl radicals caused a 59.81% drop in photoactivity, indicating their crucial role in the process. Furthermore, over six photocatalytic reaction cycles, 10%BOC/C-TO composite maintained stable performance without notable decline in efficiency. The composite also demonstrated a high capacity for degrading various types of dyes under the same conditions. These findings provide valuable insights for designing new heterogeneous photocatalysts and advancing their applications in environmental protection.