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<p>La<sub>2</sub>CuO<sub>4</sub>/WO<sub>3</sub>-based hetero-system catalyst was applied for the sunlight-driven photodegradation of Acid Blue 9 (AB-9). The mass ratio (La<sub>2</sub>CuO<sub>4</sub>/WO<sub>3</sub>) was optimized to achieve a complete color removal of AB-9 under specific conditions, including solar illumination, pH (~ 8), a temperature of 25&#xa0;°C, and a catalyst concentration of 1&#xa0;mg/mL. Comprehensive physical and optical characterizations of <i>p</i>-type La<sub>2</sub>CuO<sub>4</sub> and <i>n</i>-type WO<sub>3</sub> were conducted using XRD, UV–visible spectroscopy, SEM, and BET surface area analysis. La<sub>2</sub>CuO<sub>4</sub>/WO<sub>3</sub> hetero-system exhibits a band gap of 1.45&#xa0;eV (La<sub>2</sub>CuO<sub>4</sub>), while the WO₃ had a band gap of 2.49&#xa0;eV, both displaying direct optical transitions. Capacitance–potential (<i>C</i><sup>−2</sup>–<i>E</i>) measurements gave the flat band potentials of − 0.41 <i>V</i><sub>SCE</sub>, La<sub>2</sub>CuO<sub>4</sub>, and 0.44 <i>V</i><sub>SCE</sub>, WO<sub>3</sub>. The BET analysis revealed a specific surface area of 31.2 m<sup>2</sup>/g and a pore volume of 0.15 cm<sup>3</sup>/g for the La<sub>2</sub>CuO<sub>4</sub>/WO<sub>3</sub> hetero-system. Upon visible light, electrons are excited from the conduction band of La<sub>2</sub>CuO<sub>4</sub> (− 0.44 <i>V</i><sub>SCE</sub>) to the lower-energy conduction band of WO₃ (0.1 <i>V</i><sub>SCE</sub>). This process enhances the charge carrier separation, effectively accelerating AB-9 degradation. The photodegradation kinetic data of AB-9 were well fitted by the Langmuir–Hinshelwood (L–H) model, confirming a pseudo-first-order reaction characterized by an apparent rate constant of 0.014&#xa0;min<sup>−1</sup> (<i>t</i><sub>1/2</sub> = of 55&#xa0;min). Overall, the La<sub>2</sub>CuO<sub>4</sub>/WO<sub>3</sub> hetero-system demonstrates high photocatalytic efficiency for AB-9 degradation under natural sunlight, highlighting its potential for sustainable water treatment applications.</p>

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Boosted photocatalytic removal of Acid Blue 9 from aqueous solution over a novel p-La2CuO4/n-WO3 hetero-junction under natural solar light

  • 期刊论文

  • 发表日期：

    2025年10月10日

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  • A. Bouaoune,
  • H. Lahmar,
  • S. Douafer,
  • A. Sahmi,
  • M. Trari,
  • M. Benamira

摘要

La2CuO4/WO3-based hetero-system catalyst was applied for the sunlight-driven photodegradation of Acid Blue 9 (AB-9). The mass ratio (La2CuO4/WO3) was optimized to achieve a complete color removal of AB-9 under specific conditions, including solar illumination, pH (~ 8), a temperature of 25 °C, and a catalyst concentration of 1 mg/mL. Comprehensive physical and optical characterizations of p-type La2CuO4 and n-type WO3 were conducted using XRD, UV–visible spectroscopy, SEM, and BET surface area analysis. La2CuO4/WO3 hetero-system exhibits a band gap of 1.45 eV (La2CuO4), while the WO₃ had a band gap of 2.49 eV, both displaying direct optical transitions. Capacitance–potential (C−2–E) measurements gave the flat band potentials of − 0.41 VSCE, La2CuO4, and 0.44 VSCE, WO3. The BET analysis revealed a specific surface area of 31.2 m2/g and a pore volume of 0.15 cm3/g for the La2CuO4/WO3 hetero-system. Upon visible light, electrons are excited from the conduction band of La2CuO4 (− 0.44 VSCE) to the lower-energy conduction band of WO₃ (0.1 VSCE). This process enhances the charge carrier separation, effectively accelerating AB-9 degradation. The photodegradation kinetic data of AB-9 were well fitted by the Langmuir–Hinshelwood (L–H) model, confirming a pseudo-first-order reaction characterized by an apparent rate constant of 0.014 min−1 (t1/2 = of 55 min). Overall, the La2CuO4/WO3 hetero-system demonstrates high photocatalytic efficiency for AB-9 degradation under natural sunlight, highlighting its potential for sustainable water treatment applications.