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<p>High-performance nanocomposites of high-surface-area (HSA) g-C<sub>3</sub>N<sub>4</sub> and TiO<sub>2</sub>-WO<sub>3</sub>-Bi<sub>2</sub>O<sub>3</sub>/SiO<sub>2</sub> (g-C<sub>3</sub>N<sub>4</sub>/TSBW) were successfully synthesized and evaluated for their photocatalytic degradation of organic dyes in aqueous solution under visible light irradiation. The photocatalysts were characterized using XRD, N<sub>2</sub> adsorption–desorption, FE-SEM, EDS, HR-TEM, FTIR, Raman spectroscopy, UV–Vis DRS, and PL spectroscopy. The study investigated the effects of g-C<sub>3</sub>N<sub>4</sub> content, photocatalyst loading, dye concentration and type, solution pH, scavengers, and oxidants on the photocatalytic degradation process. The g-C<sub>3</sub>N<sub>4</sub> photocatalyst, with a high surface area of approximately 100 m<sup>2</sup>/g, exhibited a combined adsorption and photocatalytic degradation effect for rhodamine B (RhB) removal. Notably, nearly 100% RhB degradation was achieved using 1&#xa0;g/L of the optimized 50% g-C<sub>3</sub>N<sub>4</sub>/TSBW heterojunction photocatalyst with an initial RhB concentration of 10&#xa0;mg/L after only 20&#xa0;min of visible light exposure. This high performance resulted from the synergistic effect of combining g-C<sub>3</sub>N<sub>4</sub> with TSBW, facilitated by the formation of a type II heterojunction between TiO<sub>2</sub> and g-C<sub>3</sub>N<sub>4</sub>, which effectively suppressed the recombination of photoinduced charge carriers. Trapping experiments provided mechanistic insights into RhB photocatalytic degradation, revealing the significant contribution of superoxide radicals (•O<sub>2</sub><sup>−</sup>). Based on these trapping experiments, a plausible photocatalytic reaction mechanism was proposed. Finally, the recyclability of the 50% g-C<sub>3</sub>N<sub>4</sub>/TSBW heterojunction photocatalyst was also demonstrated.</p>

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Synergistic photocatalysis: enhanced degradation of organic dyes using a heterojunction nanocomposite of high-surface-area g-C3N4 and TiO2 − WO3 − Bi2O3/SiO2

  • 期刊论文

  • 发表日期：

    2025年6月1日

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  • Rezvan Abdollahpour,
  • Amin Bazyari

摘要

High-performance nanocomposites of high-surface-area (HSA) g-C3N4 and TiO2-WO3-Bi2O3/SiO2 (g-C3N4/TSBW) were successfully synthesized and evaluated for their photocatalytic degradation of organic dyes in aqueous solution under visible light irradiation. The photocatalysts were characterized using XRD, N2 adsorption–desorption, FE-SEM, EDS, HR-TEM, FTIR, Raman spectroscopy, UV–Vis DRS, and PL spectroscopy. The study investigated the effects of g-C3N4 content, photocatalyst loading, dye concentration and type, solution pH, scavengers, and oxidants on the photocatalytic degradation process. The g-C3N4 photocatalyst, with a high surface area of approximately 100 m2/g, exhibited a combined adsorption and photocatalytic degradation effect for rhodamine B (RhB) removal. Notably, nearly 100% RhB degradation was achieved using 1 g/L of the optimized 50% g-C3N4/TSBW heterojunction photocatalyst with an initial RhB concentration of 10 mg/L after only 20 min of visible light exposure. This high performance resulted from the synergistic effect of combining g-C3N4 with TSBW, facilitated by the formation of a type II heterojunction between TiO2 and g-C3N4, which effectively suppressed the recombination of photoinduced charge carriers. Trapping experiments provided mechanistic insights into RhB photocatalytic degradation, revealing the significant contribution of superoxide radicals (•O2−). Based on these trapping experiments, a plausible photocatalytic reaction mechanism was proposed. Finally, the recyclability of the 50% g-C3N4/TSBW heterojunction photocatalyst was also demonstrated.