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<p>Pharmaceutical pollution in water poses a significant and escalating threat to both human health and the environment. In response to this challenge, a novel photocatalytic approach using zinc acetate nanoparticles (ZnO<sub>A</sub>-NPs) supported on clay has been developed to effectively eliminate diclofenac (DCF), a common pharmaceutical pollutant. The novelty of this study lies in the combination of ZnO-NPs with modified clay (smectite/kaolinite), which not only enhances the photocatalytic activity but also improves structural stability, adsorption capacity and reusability features that have not been extensively reported in previous studies. The photocatalyst was characterised using various techniques to ascertain its structural and textural properties. Subsequently, the DCF degradation was investigated under varying conditions, including contact time, initial pollutant concentration, pH and ZnO<sub>A</sub>/clay catalyst dosage. Remarkably, the results showed an impressive degradation of DCF of up to 94% after 90&#xa0;min of treatment. The photocatalytic oxidation of DCF was fitted by the pseudo-second-order (PSO) kinetic model. Furthermore, the catalyst performs well for up to four cycles, highlighting its potential for sustainable and reusable applications for water treatment.</p>

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Photocatalytic degradation of diclofenac in water using new composite ZnO-modified smectite/kaolinite clay

  • 期刊论文

  • 发表日期：

    2025年11月11日

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  • Oumaima Atawa,
  • Kawther Ben Mabrouk,
  • Kawther Yahya,
  • Ines Khemissi,
  • Anouar Hajjaji,
  • Hedi Ben Amor,
  • Noureddine Hamdi

摘要

Pharmaceutical pollution in water poses a significant and escalating threat to both human health and the environment. In response to this challenge, a novel photocatalytic approach using zinc acetate nanoparticles (ZnOA-NPs) supported on clay has been developed to effectively eliminate diclofenac (DCF), a common pharmaceutical pollutant. The novelty of this study lies in the combination of ZnO-NPs with modified clay (smectite/kaolinite), which not only enhances the photocatalytic activity but also improves structural stability, adsorption capacity and reusability features that have not been extensively reported in previous studies. The photocatalyst was characterised using various techniques to ascertain its structural and textural properties. Subsequently, the DCF degradation was investigated under varying conditions, including contact time, initial pollutant concentration, pH and ZnOA/clay catalyst dosage. Remarkably, the results showed an impressive degradation of DCF of up to 94% after 90 min of treatment. The photocatalytic oxidation of DCF was fitted by the pseudo-second-order (PSO) kinetic model. Furthermore, the catalyst performs well for up to four cycles, highlighting its potential for sustainable and reusable applications for water treatment.