Abstract
In this study, we report the photodegradation of a pharmaceutical pollutant namely the tetracycline (TC) onto the spinel ZnAl2O4. The semiconductor ZnAl2O4 was synthesized by chemical route and characterized by X-ray diffraction, scanning electron microscopy and optical analysis. The capacitance potential (C−2–E) measurements showed that the oxide exhibit n-type conduction, supported by a negative thermo-power. The degradation of TC was performed by combined adsorption/photocatalysis processes. The result showed that 30 min of contact time was sufficient to reach 42% of the adsorption capacity; the photodegradation rate of TC was evaluated on ZnAl2O4 under optimal operating parameters pH ~ 4.4, catalyst dose (1 g/L), and initial TC concentration (20 mg/L). The kinetic shows that the TC disappears almost completely (92%) and follows a second order model with a half photocatalytic lifetime of 21 min for a TC concentration of 20 mg/L. The mechanism of the antibiotic tetracycline photodegradation on ZnAl2O4 indicated that the \({\text{O}}_{2}^{ \cdot - }\) radicals and the holes are mainly responsible for the oxidation of TC. The process can be qualified as clean remediation and is a part of a sustainable development perspective.
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Acknowledgements
This work was financially supported by the Mechanic and Engineering Process Faculty and the Chemistry Faculty (USTHB, Algiers). The authors are thankful to Amar MANSERI for SEM images (CRTSE, Algiers, Algeria) and to Leith ELMOUSSAOUI for the TOC analysis (CRD, Boumerdes, Algeria)
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Hemmi, A., Belmedani, M., Mekatel, E. et al. Kinetic and mechanism studies of tetracycline photodegradation using synthesized ZnAl2O4. Reac Kinet Mech Cat 134, 1039–1054 (2021). https://doi.org/10.1007/s11144-021-02114-5
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DOI: https://doi.org/10.1007/s11144-021-02114-5