MnFe2O4 nanoparticles as new catalyst for oxidative degradation of phenol by peroxydisulfate |
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Authors: | Marcela Stoi Cornelia Muntean Bogdan Militaru |
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Affiliation: | 1 Faculty of Industrial Chemistry and Environmental Engineering, Politehnica University Timisoara, RO-300223 Timi?oara, Romania;2 Research Institute for Renewable Energy, Politehnica University Timisoara, RO-300006, Timisoara, Romania |
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Abstract: | Manganese ferrite nanopowder was prepared by thermal decomposition at 400°C of the gel synthesized from manganese and iron nitrates and polyvinyl alcohol. X-ray diffractometry evidenced that manganese ferrite was formed as single crystalline phase at this temperature. Scanning electron microscope images evidenced the formation of very fine spherical particles (d < 11 nm) of manganese ferrite, with specific surface area of 147 m2/g. The powder obtained at 400°C was used as a catalyst for the oxidative degradation of phenol in aqueous solutions, in the presence of potassium peroxydisulfate as oxidant. High phenol removal efficiencies above 90% were reached at: pH 3–3.5, phenol initial concentration around 50 mg/L, peroxydisulfate:phenol mass ratio 10:1, and catalyst dose 3 g/L. Total organic carbon measurements showed that the degradation of phenol goes, under these conditions, to mineralization in an extent of 60%. |
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Keywords: | Manganese ferrite Nanoparticles Phenol Peroxydisulfate Catalytic oxidation |
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