Photocatalytic Degradation of Sodium Diclofenac Using Spinel Ferrites: Kinetic Aspects

The photocatalytic degradation of sodium diclofenac, a nonsteroidal anti-inflammatory drug, was carried out comparing the activity of cobalt, nickel, and zinc ferrites as catalysts, using UV radiation and hydrogen peroxide. The materials were characterized by X-ray diffraction and by Fourier-Transfo...

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Bibliographic Details
Published in:Topics in catalysis 2022, Vol.65 (13-16), p.1419-1426
Main Authors: Gerbaldo, Maria Veronica, Marchetti, Sergio Gustavo, Mendoza, Sandra Marina, Elias, Veronica Rita, Mendieta, Silvia Nazaret, Crivello, Monica Elsie
Format: Article
Language:English
Subjects:
Acetic acid
Catalysis
Characterization and Evaluation of Materials
Chemistry
Chemistry and Materials Science
Cobalt ferrites
Diclofenac
Fourier transforms
Hydrogen peroxide
Industrial Chemistry/Chemical Engineering
Nickel ferrites
Nonsteroidal anti-inflammatory drugs
Organic carbon
Original Paper
Pharmacy
Photocatalysis
Photodegradation
Photoelectrons
Physical Chemistry
Pollutants
Reaction kinetics
Sodium
Spinel
Ultraviolet radiation
Zinc ferrites
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Summary:The photocatalytic degradation of sodium diclofenac, a nonsteroidal anti-inflammatory drug, was carried out comparing the activity of cobalt, nickel, and zinc ferrites as catalysts, using UV radiation and hydrogen peroxide. The materials were characterized by X-ray diffraction and by Fourier-Transform Infrared, UV–Visible and X-ray photoelectron spectroscopies. It was determined that all samples had spinel structure: ZnFe 2 O 4 normal spinel, CoFe 2 O 4 partially inverse spinel and NiFe 2 O 4 inverse spinel. A simulated solution of 40 ppm of sodium diclofenac was completed degraded within 4 h meanwhile 86 to 83% of total organic carbon was obtained. The photocatalytic process take place via radical mechanism. The decrease of samples pH could be attributed to the formation of small acid molecules like oxalic and acetic acid, which are by-products of sodium diclofenac photodegradation. The reaction kinetic was also studied, and the photo-Fenton degradation of sodium diclofenac could be described by first-order model with a linear correlations coefficient R 2  > 0.95 in all cases. The information based on kinetic studies can be applied for developing reactors for pollutant elimination, especially for industrial scale.
ISSN:1022-5528
1572-9028
DOI:10.1007/s11244-022-01627-0