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<p>This study describes the preparation of TiO<sub>2</sub>-modified Bi<sub>2</sub>O<sub>3</sub> photocatalysts with different TiO<sub>2</sub> contents, synthesized via an in situ hydrothermal method. The powder samples were characterized by XRD, SEM, TEM, FTIR–ATR, UV–Vis, XPS, and N₂ physisorption analysis. The photocatalytic activity of the TiO<sub>2</sub>-modified Bi<sub>2</sub>O<sub>3</sub> was studied for the removal of methyl orange (MO) and methylene blue (MB) under different reaction conditions. The TiO<sub>2</sub>-modified Bi<sub>2</sub>O<sub>3</sub> photocatalysts exhibited superior photocatalytic activity compared to the pristine samples of TiO<sub>2</sub> and Bi<sub>2</sub>O<sub>3</sub>. The BiT16 sample achieved degradation rates of approximately 93.9% and 98.2% for MO and MB, respectively, within 120&#xa0;min of reaction at 30&#xa0;ppm. These results are attributed to the band gap values, differences in textural features, TiO<sub>2</sub> content, and the reduction in the recombination process of e⁻/h⁺ pairs in the Bi<sub>2</sub>O<sub>3</sub>–TiO<sub>2</sub> composites. Reaction kinetics were determined using the Langmuir–Hinshelwood mechanism, and during the third photoreaction cycle, the TiO<sub>2</sub>-modified Bi<sub>2</sub>O<sub>3</sub> (BiT16) achieved photocatalytic degradation rates of 65.6% for MO and 70.5% for MB.</p>

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Photocatalytic removal of synthetic dyes using Bi2O3–TiO2 nanocomposites obtained by simple hydrothermal route

  • 期刊论文

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  • 发表日期：

    2025年1月17日

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  • V. Ruiz-Santoyo,
  • S. García-Carvajal,
  • M. C. Arenas-Arrocena

摘要

This study describes the preparation of TiO2-modified Bi2O3 photocatalysts with different TiO2 contents, synthesized via an in situ hydrothermal method. The powder samples were characterized by XRD, SEM, TEM, FTIR–ATR, UV–Vis, XPS, and N₂ physisorption analysis. The photocatalytic activity of the TiO2-modified Bi2O3 was studied for the removal of methyl orange (MO) and methylene blue (MB) under different reaction conditions. The TiO2-modified Bi2O3 photocatalysts exhibited superior photocatalytic activity compared to the pristine samples of TiO2 and Bi2O3. The BiT16 sample achieved degradation rates of approximately 93.9% and 98.2% for MO and MB, respectively, within 120 min of reaction at 30 ppm. These results are attributed to the band gap values, differences in textural features, TiO2 content, and the reduction in the recombination process of e⁻/h⁺ pairs in the Bi2O3–TiO2 composites. Reaction kinetics were determined using the Langmuir–Hinshelwood mechanism, and during the third photoreaction cycle, the TiO2-modified Bi2O3 (BiT16) achieved photocatalytic degradation rates of 65.6% for MO and 70.5% for MB.