Open AccessInfluence of the Local Structure on the Photocatalytic Properties of Zinc Spinel Ferrite Nanoparticles
Author(s) -
Luciana B. Biazati,
L. Lorenzini,
Sandra Aparecida Duarte Ferreira,
A.O. Porto,
Eustáquio de Castro,
José Domingos Fabris,
M.B.J.G. Freitas,
Maria de Fátima Fontes Lélis
Publication year - 2022
Publication title -
journal of the brazilian chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.337
H-Index - 70
eISSN - 1678-4790
pISSN - 0103-5053
DOI - 10.21577/0103-5053.20210130
Subject(s) - indigo carmine , zinc ferrite , spinel , aqueous solution , magnetite , zinc , materials science , nuclear chemistry , photocatalysis , ferrite (magnet) , chemistry , inorganic chemistry , catalysis , metallurgy , composite material , biochemistry
The correlation between iron distribution in octahedral or tetrahedral sites in synthetic magnetite and zinc spinel ferrites and their catalytic properties were investigated in this work. The zinc-doped nanomagnetites were prepared by co-precipitation method and annealed at 420 °C. X-ray diffraction, UV-Vis, X-ray absorption and 57Fe Mössbauer spectroscopies were used to identify iron sites. The obtained results showed that ZnII replaces the relatively smaller FeIII cation in the tetrahedral sites, increasing the cubic lattice dimension, and this replacement remarkably enhances the catalytic effectiveness of the Zn-spinel ferrite towards the indigo carmine degradation compared to undoped magnetite. The indigo carmine degradation experiments were carried out using photo-Fenton method in which 50 mL of indigo carmine dye aqueous solutions (20 mg L−1, pH 3.0), 20 mg ZnxFe(3-x)O4, and 2.0 mL H2O2 (aqueous solution at 0.028 mol L−1) were placed under UV light at 25 °C. Under these experimental conditions the degradation rate of indigo carmine was superior to 98%.