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<p>The degradation of the antibiotic tetracycline (TC) onto the spinel MgAl<sub>2</sub>O<sub>4</sub> through combined adsorption photocatalysis processes was conducted. The semiconductor MgAl<sub>2</sub>O<sub>4</sub> was synthesized by co-precipitation method and characterized by X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), and optical analysis. Capacitance potential (C<sup>−2</sup>–E) measurements conducted in Na<sub>2</sub>SO<sub>4</sub> medium indicate that the oxide exhibits <b>n</b>-type conduction, a result supported by a positive thermo-power. The TC degradation results show that under the optimal operating parameters of pH ~  4.4, catalyst dose (0.75&#xa0;g. L<sup>−1</sup>), and initial TC concentration (20&#xa0;mg. L<sup>−1</sup>), a contact time of 30&#xa0;min is sufficient to achieve 58% of the adsorption capacity. The kinetic study reveals that the TC on MgAl<sub>2</sub>O<sub>4</sub> disappears almost completely (88%) under sunlight irradiation and follows the second-order model with a half photocatalytic lifetime of 33&#xa0;min for a TC concentration of 20&#xa0;mg. L<sup>−1</sup>. This process can be described as clean restoration alternative and is part of a sustainability perspective.</p>

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Characterization of MgAl2O4 semiconductor prepared by co-precipitation route: application as photocatalyst for tetracycline degradation

  • 期刊论文

  • 发表日期：

    2025年1月28日

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  • Asma Hemmi,
  • Mohamed Belmedani,
  • Elhadj Mekatel,
  • Ahmed Malek Djaballah,
  • Zahra Sadaoui,
  • Billal Brahimi,
  • Mohamed Trari

摘要

The degradation of the antibiotic tetracycline (TC) onto the spinel MgAl2O4 through combined adsorption photocatalysis processes was conducted. The semiconductor MgAl2O4 was synthesized by co-precipitation method and characterized by X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), and optical analysis. Capacitance potential (C−2–E) measurements conducted in Na2SO4 medium indicate that the oxide exhibits n-type conduction, a result supported by a positive thermo-power. The TC degradation results show that under the optimal operating parameters of pH ~  4.4, catalyst dose (0.75 g. L−1), and initial TC concentration (20 mg. L−1), a contact time of 30 min is sufficient to achieve 58% of the adsorption capacity. The kinetic study reveals that the TC on MgAl2O4 disappears almost completely (88%) under sunlight irradiation and follows the second-order model with a half photocatalytic lifetime of 33 min for a TC concentration of 20 mg. L−1. This process can be described as clean restoration alternative and is part of a sustainability perspective.