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<p>Understanding the exceptional photocatalytic activity of nanomaterials requires an in-depth comprehension of the dynamic interfacial connection between heterojunction constituents. A direct photocatalyst, k-Al<sub>2</sub>O<sub>3</sub>@Cr<sub>2</sub>O<sub>3</sub>@g-C<sub>3</sub>N<sub>4</sub> (ACOCN) was synthesized by a simple sol–gel technique using k-Al<sub>2</sub>O<sub>3</sub>@Cr<sub>2</sub>O<sub>3</sub> (ACO) and g-C<sub>3</sub>N<sub>4</sub> (CN) precursors. The successful synthesis of the composite was validated by the XRD, SEM, and XPS examinations, while the UV–Vis indicated smaller bandgap energy compared to pure ACO. The as-prepared materials exhibited visible light-driven photocatalytic activity was assessed by degrading the 30 ppm aqueous Congo Red (CR) dye solution using 50 mg of ACOCN at pH 7. Within 75 min, 97.4% of the dye was decomposed and a first-order kinetics rate of 0.0458 min<sup>−1</sup> and half-life of 15 min. The reaction kinetics well fitted the quasi-first-order model, and the reaction rate constant using ACOCN was 0.0458&#xa0;min<sup>−1</sup> which was twice that of the CN and more than thrice that of the k- ACO. The CR degradation was influenced by OH<sup><b>.</b></sup> and <i>h</i><sup><b>+</b></sup> as revealed by the scavenger tests. The exceptional photocatalytic activity was associated with the creation of a Z-scheme ACOCN photocatalyst, which leads to the hindrance of electrons–holes recombination as supported by the photo-luminesce, low bandgap energy (2.93 eV), and transient photocurrent responses. Due to its straightforward and quick manufacturing technique, this work will provide valuable insights into the remarkable efficacy of the Z-scheme in CR dye photocatalytic degradation.</p>

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Photocatalytic decomposition of organic dyes via κ-Al2O3@Cr2O3 loaded on g-C3N4 nanostructures

  • 期刊论文

  • 发表日期：

    2025年9月7日

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  • Laila S. Alqarni,
  • Mohamed N. Goda,
  • Abuzar Albadri,
  • Mukhtar Ismail,
  • Kamal K. Taha,
  • A. Modwi

摘要

Understanding the exceptional photocatalytic activity of nanomaterials requires an in-depth comprehension of the dynamic interfacial connection between heterojunction constituents. A direct photocatalyst, k-Al2O3@Cr2O3@g-C3N4 (ACOCN) was synthesized by a simple sol–gel technique using k-Al2O3@Cr2O3 (ACO) and g-C3N4 (CN) precursors. The successful synthesis of the composite was validated by the XRD, SEM, and XPS examinations, while the UV–Vis indicated smaller bandgap energy compared to pure ACO. The as-prepared materials exhibited visible light-driven photocatalytic activity was assessed by degrading the 30 ppm aqueous Congo Red (CR) dye solution using 50 mg of ACOCN at pH 7. Within 75 min, 97.4% of the dye was decomposed and a first-order kinetics rate of 0.0458 min−1 and half-life of 15 min. The reaction kinetics well fitted the quasi-first-order model, and the reaction rate constant using ACOCN was 0.0458 min−1 which was twice that of the CN and more than thrice that of the k- ACO. The CR degradation was influenced by OH. and h+ as revealed by the scavenger tests. The exceptional photocatalytic activity was associated with the creation of a Z-scheme ACOCN photocatalyst, which leads to the hindrance of electrons–holes recombination as supported by the photo-luminesce, low bandgap energy (2.93 eV), and transient photocurrent responses. Due to its straightforward and quick manufacturing technique, this work will provide valuable insights into the remarkable efficacy of the Z-scheme in CR dye photocatalytic degradation.