The effects of heat treatment temperatures on photocatalytic activity of cobalt ferrite nanoparticles synthesised by microwave-assisted combustion method / Ibrahim Hakki Karakas in COLORATION TECHNOLOGY, Vol. 139, N° 3 (06/2023)  

[article]  inCOLORATION TECHNOLOGY > Vol. 139, N° 3 (06/2023) . - p. 276-293 Titre : The effects of heat treatment temperatures on photocatalytic activity of cobalt ferrite nanoparticles synthesised by microwave-assisted combustion method Type de document : texte imprimé Auteurs : Ibrahim Hakki Karakas, Auteur ; Zeynep Karcioglu Karakas, Auteur Année de publication : 2023 Article en page(s) : p. 276-293 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Colorants -- Oxydation Eaux usées -- Epuration Eaux usées -- Teneur en colorants Ferrite de cobalt Nanoparticules Photocatalyse Traitement thermique Index. décimale : 667.3 Teinture et impression des tissus Résumé : In this study, the effects on the photocatalytic activities of particles after heat treatment has been applied to cobalt ferrite nanoparticles produced by microwave-assisted combustion method were observed. The heat treatment applied to the samples was produced with only the microwave effect, at temperatures ranging from 300 to 1000°C. Thermogravimetric analysis was performed on the precursor sample in air atmosphere. During this analysis, the gases released up to 1200°C were identified with a Fourier-transform infrared (FTIR) spectrometer integrated into a thermogravimetric analysis system. Then, the cobalt ferrite nanoparticles produced with heat treatments applied at various temperatures were used as a photocatalyst to remove the dyestuff content in synthetic wastewaters prepared by using Astrazon Red GTL textile dye by photocatalytic oxidation, and their photocatalytic activities were compared. In these experiments, the operational parameters for photocatalysis processes were applied as 400 rpm for stirring speed, 50 mg/L for initial contaminant concentration, 0.5 g/L for catalyst dosage, 25°C for temperature, and 4400 μW/cm2 for light intensity. As a result of the experiments, it was observed that the crystal structure of the cobalt ferrite nanoparticles produced with the increase of the applied heat treatment temperature improved significantly. The obtained data show a strong relationship between the structural properties of materials and their photocatalytic activities. In addition, it was determined that the dyestuff in the solution was completely degraded in the experiments, and it was determined that all processes were compatible with the pseudo-first-order kinetic model. Note de contenu : - EXPERIMENTAL : Preparation of materials - Synthesis method - General properties of Astrazon Red GTL textile dye - Characterisation of the samples - RESULTS AND DISCUSSION : Effects on structural properties of the heat treatment temperature - Evaluation of thermal stability of cobalt ferrite nanoparticles - Effects on morphological properties of the heat treatment temperature - Effects on magnetic properties of the heat treatment temperature - Effects on photocatalytic activities of the heat treatment temperature - The effect of UV irradiation on removal efficiency - Reaction kinetics - Table 1 : Average particle sizes and lattice parameters calculated from X-ray diffraction (XRD) results for cobalt ferrite nanoparticles subjected to heat treatment at various temperatures - Table 2 : Various magnetic characteristics calculated from the hysteresis curves of cobalt ferrite nanoparticles prepared with heat treatment applied at different temperatures - Table 3 : Calculated removal efficiencies and rate constants for photocatalysis experiments performed with samples produced by heat treatments applied at different temperatures DOI : https://doi.org/10.1111/cote.12647 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12647 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39538 [article]

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