PHOTOCATALYTIC REMOVAL OF METRONIDAZOLE USING MAGNETIC TIO2 NANOCATALYST (FE3O4@SIO2@TIO2): SYNTHESIS, CHARACTERIZATION, AND OPERATIONAL PARAMETERS

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ESRAFILI ALI; KHOSRAVI SAEEDEH; GHOLAMI MITRA; FARZADKIA MAHDI; ABDORAHIMI GHADIR

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Journal Paper

Paper Information

Journal: JOURNAL OF MAZANDARAN UNIVERSITY OF MEDICAL SCIENCES Year:2018 | Volume:28 | Issue:159 Page(s): 97-115

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Title

PHOTOCATALYTIC REMOVAL OF METRONIDAZOLE USING MAGNETIC TIO2 NANOCATALYST (FE3O4@SIO2@TIO2): SYNTHESIS, CHARACTERIZATION, AND OPERATIONAL PARAMETERS

Author(s)

Keywords

PHOTOCATALYSISQ1

TITANIUM DIOXIDEQ2

MAGNETIC NANOPARTICLESQ1

METRONIDAZOLEQ3

Abstract

Background and purpose: PHOTOCATALYSIS process with TiO2 is a well-known method forremoval of pollutants from water. However, the small particle size of TiO2, and therefore difficulty in itsseparation after treatment impede its commercialization. The aim of this study was to synthetize theFe3O4@SiO2@TiO2 MAGNETIC NANOPARTICLES (NPs) and evaluation of its efficiency in removal ofmetronidazole (MNZ) from aqueous solutions. Materials and methods: The NPs were synthetized via sol-gel method, and characterized usingSEM, XRD, VSM, and BET analysis. Then, the effect of operational parameters, including catalystdosage, pH, and initial concentration of MNZ on removal efficiency were examined. The order ofreaction and kinetic model, as well as the reusability potential of the catalyst were all investigated in theoptimum run. Finally, comparison was made between the adsorption, direct photolysis, application ofcommercial Degussa P25 TiO2 (p25), and Fe3O4@SiO2@TiO2 NPs. Results: The so-synthesized catalyst showed good superparamagnetic properties. The optimumconditions for the MNZ removal were pH=8, the catalyst dosage=1. 5 g/L, and initial concentration ofMNZ=40 mg/L under 180 min UV irradiation time. The kinetic study revealed that the photocatalyticdegradation of MNZ followed the pseudo-first order (R2= 0. 9912) and the Langmuir-Hinshelwood model(R2= 0. 9976). Conclusion: According to the results, the Fe3O4@SiO2@TiO2 NPs were almost as effective ascommercial catalyst Degussa P25 TiO2 in removal of MNZ (P> 0. 05). Due to the simple separation withexternal magnetic field and reusability potential, Fe3O4@SiO2@TiO2 NPs can be considered as a suitablealternative for Degussa P25 TiO2.

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