In the present work we report the synthesis of mixed ferrites doped with Co2+, Cu2+ and Ba2+ cations, using citrate sol–gel combustion route in air atmosphere, at 950 °C for 3 hours, produced substituted M-type barium ferrites powders particles with crystallite sizes varying between 145 and 155 nm. The percentages of yield obtained were on average 42%. The synthesized ferrites were characterized by techniques such as powder X-ray diffraction, evidencing the formation of M-type barium hexaferrite and copper and cobalt substituted M-type barium ferrite with hematite in smaller proportion. The possible growth of M-type barium ferrite with copper and cobalt may be due to a larger size of the cobalt atom with respect to copper and that a higher proportion of cobalt salt was used in the synthesis route. Increase in the metal ion substituted content leads to a decrease in the lattice strain and may be responsible for an increase in the crystallite size because greater tensile strain leads to elongation of the particles. The particle size of the synthesized ferrites differs significantly when they are doped, with Ferrite doped with copper having the smallest particle size compared to Ferrite doped with cobalt. We also performed spectroscopic analyses, RAMAN that showed, the substitution of cooper or cobalt in the M-type barium ferrite powders particle leads to a minor intensity of resonance band when compared with the parent compound and the differences between Fe3+, Cu2+ and Co2+ ions in a tetrahedral coordination is their ionic radii. The increase in the ionic radii causes a local distortion and vibrational bands of distorted polyhedra in substituted M-type barium ferrites. The chemical composition of this sample was determined as Ba1.0Fe11.83O19.22, Ba1.0Co1.02Fe11.01O18.35 and Ba1.02Cu0.56Fe11.35O18.26 using an AAS device. Both are very close to the theoretical formula. The influence of the synthesized ferrite samples was explored in the ozonation of a dye of unknown chemical structure. The effect was evidenced by visible ultraviolet spectroscopy technique. The results obtained show that the ink could be decolorized by applying oxidation by ozonation, however, when substituted M-type barium ferrite is added, the discoloration increases when this is doped with copper and cobalt, being higher using this last ferrite. The degradation process by ozonation presented in this work, carried out in the presence of copper and cobalt substituted M-type barium ferrites, would constitute an example of technology for the environment.
In the present article, the synthesis of copper and cobalt co-doped ferrites (Cu0.3Co0.7Fe2O4) and application as an electrode modifier were demonstrated. The synthesis of Cu0.3Co0.7Fe2O4 was conducted using the citrate sol-gel method by mixing the stoichiometric ratio of cobalt chloride, copper chloride, and ferrous chloride in aqueous solutions with citric acid and adjusting the pH of the solution to 7 using liquid ammonia. The spinel phase structure was confirmed by means of X-ray powder diffraction. Scanning electron microscopy were used to investigate the morphology of the sample and the vibrations of the functional groups were determined by Raman and IR-ATR spectroscopy. A promising modified electrode based on copper and cobalt co-doped ferrites (Cu0.3Co0.7Fe2O4)-modified glassy carbon electrode (Cu0.3Co0.7Fe2O4 / GCE) was presented for the sensitive detection of N-acetyl-p-aminophenol (NAP). The electrochemical behavior of NAP on Cu0.3Co0.7Fe2O4 / GCE was investigated by cyclic voltammetry. The modified electrode displayed excellent redox activity towards NAP, with a significant reduction of overpotential compared to bare GCE. A good linear relationship was obtained between the concentration and current response of NAP with a detection limit of 28.9 nM The excellent electrocatalytic activity of Cu0.3Co0.7Fe2O4 suggesting potential application of the modified electrode as an electrochemical sensor for N-acetyl-p-aminophenol.
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