The combined effectiveness of activated carbon (AC) / ZnO for the adsorption of mebeverine hydrochloride / photocatalytic degradation under sunlight

Djebri, Assia; Belmedani, Mohamed; Belhamdi, Badreddine; Trari, M.; Sadaoui, Zahra

doi:10.1007/s11144-021-01932-x

Cited by 12 publications

(1 citation statement)

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“…To describe the kinetics of TC degradation, we were inspired by the results reported in the literature. The photodegradation kinetics are described by first and second order models [30,[45][46][47][48][49][50]:…”

Section: Kinetic Measurementmentioning

confidence: 99%

Kinetic and mechanism studies of tetracycline photodegradation using synthesized ZnAl2O4

Hemmi

Belmedani

Mekatel

et al. 2021

Reac Kinet Mech Cat

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In this study, we report the photodegradation of a pharmaceutical pollutant namely the tetracycline (TC) onto the spinel ZnAl 2 O 4 . The semiconductor ZnAl 2 O 4 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 thermopower. 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 ZnAl 2 O 4 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 ZnAl 2 O 4 indicated that the O ⋅− 2 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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