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<p>Rifampicin, a widely used antibiotic, poses significant environmental risks when it enters wastewater systems due to its persistence and toxicity. The compound has been detected in various rivers and bodies of water, including the Ganges River in India and the Yangtze River in China, where its presence in wastewater effluents has raised concerns about public health and aquatic ecosystems. Despite numerous studies focusing on the degradation and removal of rifampicin from wastewater, little attention has been given to the effects of catalyst parameters in the degradation process. This gap in research is significant, as optimizing catalyst conditions could enhance the efficiency of wastewater treatment. In this context, a new approach was explored. Specifically, we have synthesized undoped, bismuth (Bi)-doped, and bismuth-nickel (Bi-Ni) codoped CuO-ZnO mixed oxides using the spray pyrolysis technique, which has not been reported previously. The morphological analysis of the synthesized CuO-ZnO mixed oxides reveals a variety of shapes, ranging from cubic to spherical structures, with the doping process influencing the size and uniformity of the particles. Transmission electron microscopy (TEM) further confirms the presence of two distinct phases CuO and ZnO indicating successful doping. Crystallite sizes of the mixed oxides increase with the doping of Bi and Ni, which is consistent with the observed changes in the structural properties. Optical characterization of the materials shows a shift in the band gap from 1.67 eV for the undoped CuO-ZnO to 1.53 eV for the Bi-Ni codoped CuO-ZnO, suggesting enhanced light absorption properties due to the doping process highlighting the material's potential for catalysis. The study also explored the effects of catalyst dosage, pH, and scavengers on the degradation process. The results demonstrated that a catalyst dosage of 20 mg and a pH of 2 resulted in a remarkable 96% degradation of rifampicin within 120 min. Notably, all radicals contributed to the degradation process, emphasizing the effectiveness of the CuO-ZnO thin films as a promising catalyst for wastewater treatment.</p>

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Bi and Bi-Ni Codoped CuO-ZnO Mixed Oxides: Advanced Catalysts for Efficient Rifampicin Degradation: Influence of Catalyst Dosage, pH, and Scavengers

  • 期刊论文

  • 发表日期：

    2025年3月18日

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  • Moez Hajji,
  • Anis Akkari,
  • Antonio Garcia-Loureiro,
  • Najoua Turki Kamoun

摘要

Rifampicin, a widely used antibiotic, poses significant environmental risks when it enters wastewater systems due to its persistence and toxicity. The compound has been detected in various rivers and bodies of water, including the Ganges River in India and the Yangtze River in China, where its presence in wastewater effluents has raised concerns about public health and aquatic ecosystems. Despite numerous studies focusing on the degradation and removal of rifampicin from wastewater, little attention has been given to the effects of catalyst parameters in the degradation process. This gap in research is significant, as optimizing catalyst conditions could enhance the efficiency of wastewater treatment. In this context, a new approach was explored. Specifically, we have synthesized undoped, bismuth (Bi)-doped, and bismuth-nickel (Bi-Ni) codoped CuO-ZnO mixed oxides using the spray pyrolysis technique, which has not been reported previously. The morphological analysis of the synthesized CuO-ZnO mixed oxides reveals a variety of shapes, ranging from cubic to spherical structures, with the doping process influencing the size and uniformity of the particles. Transmission electron microscopy (TEM) further confirms the presence of two distinct phases CuO and ZnO indicating successful doping. Crystallite sizes of the mixed oxides increase with the doping of Bi and Ni, which is consistent with the observed changes in the structural properties. Optical characterization of the materials shows a shift in the band gap from 1.67 eV for the undoped CuO-ZnO to 1.53 eV for the Bi-Ni codoped CuO-ZnO, suggesting enhanced light absorption properties due to the doping process highlighting the material's potential for catalysis. The study also explored the effects of catalyst dosage, pH, and scavengers on the degradation process. The results demonstrated that a catalyst dosage of 20 mg and a pH of 2 resulted in a remarkable 96% degradation of rifampicin within 120 min. Notably, all radicals contributed to the degradation process, emphasizing the effectiveness of the CuO-ZnO thin films as a promising catalyst for wastewater treatment.