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<p>The aim of the present work is to investigate the photocatalytic degradation of propyl paraben (propyl para-hydroxybenzoate, PrP) using Cu<sub>2</sub>O-ZnO-NPs photocatalyst followed by the identification of the oxidation by-products. The Cu<sub>2</sub>O-ZnO-NPs material, synthesized using a green chemistry approach, was used as a photocatalyst for the removal of PrP. The nanoparticles were characterized by XRD, XRF, diffuse reflectance spectroscopy, ATG/DTG, FTIR, SEM–EDX, BET&#xa0;and FRX techniques. The XRD results showed that Cu<sub>2</sub>O-ZnO-NPs have a nanometer size of 24.13&#xa0;nm. The DR-UV analysis showed that Cu<sub>2</sub>O-ZnO-NPs has an E<sub>g</sub> of 2.35 eV which corresponds to the absorption of visible light. The SEM–EDX analysis showed that the ZnO has a hexagonal structure while the CuO has a monoclinic structure. The effect of variables such as propyl paraben concentration (PrP), hydrogen peroxide concentration (H<sub>2</sub>O<sub>2</sub>), catalyst dose, and the reaction temperature on the pseudo-first order reaction rate constant (k<sub>app</sub>) of the reaction was evaluated. It was found that the degradation of PrP was governed by hydroxyl radical °OH attack and the pathways consisted of a cascade of reactions. The optimum photocatalytic degradation was obtained with an initial catalyst dose of 50 mg, pH 7, and PrP concentration of 10 mg/L. When the photocatalyst was irradiated, a significant PrP degradation was observed after 30 min of irradiation. The results suggest that Cu<sub>2</sub>O-ZnO-NPs act as a good photocatalyst for PrP degradation under visible light.</p>

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Propyl paraben removal using Cu2O/ZnO-NPs photocatalyst elaborated via green method

  • 期刊论文

  • 发表日期：

    2025年1月4日

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  • Bilal Chikhi,
  • Meriem Gouasmi,
  • Alaimia Mounia,
  • Lazhar Gasem,
  • Adel Saadi,
  • Nassima Mekaoui,
  • Khaldoun Bachari,
  • Amel Boudjemaa

摘要

The aim of the present work is to investigate the photocatalytic degradation of propyl paraben (propyl para-hydroxybenzoate, PrP) using Cu2O-ZnO-NPs photocatalyst followed by the identification of the oxidation by-products. The Cu2O-ZnO-NPs material, synthesized using a green chemistry approach, was used as a photocatalyst for the removal of PrP. The nanoparticles were characterized by XRD, XRF, diffuse reflectance spectroscopy, ATG/DTG, FTIR, SEM–EDX, BET and FRX techniques. The XRD results showed that Cu2O-ZnO-NPs have a nanometer size of 24.13 nm. The DR-UV analysis showed that Cu2O-ZnO-NPs has an Eg of 2.35 eV which corresponds to the absorption of visible light. The SEM–EDX analysis showed that the ZnO has a hexagonal structure while the CuO has a monoclinic structure. The effect of variables such as propyl paraben concentration (PrP), hydrogen peroxide concentration (H2O2), catalyst dose, and the reaction temperature on the pseudo-first order reaction rate constant (kapp) of the reaction was evaluated. It was found that the degradation of PrP was governed by hydroxyl radical °OH attack and the pathways consisted of a cascade of reactions. The optimum photocatalytic degradation was obtained with an initial catalyst dose of 50 mg, pH 7, and PrP concentration of 10 mg/L. When the photocatalyst was irradiated, a significant PrP degradation was observed after 30 min of irradiation. The results suggest that Cu2O-ZnO-NPs act as a good photocatalyst for PrP degradation under visible light.