Resumo

AQUINO, ELIAZAR et al. FERRITE OF Cd, Pb and Mn, SYNTHESIS AND CHARACTERIZATION HYDROCHEMICAL WAY. Dyna rev.fac.nac.minas [online]. 2011, vol.78, n.167, pp.78-86. ISSN 0012-7353.

The objective of the present work was to obtain by hydrochemical route and under optimized conditions, Cd, Pb and Mn and to compare its chemical, physicochemical and stoichiometric characteristics. There were prepared dissolutions from these metals to 1 g/L, he was added FeSO₄.7H₂O for a molar relation 15:1 [Fe²⁺]/[Me²⁺], it was kept to pH of 10 and 60ºC in baths. There was corroborated that the process of ferrite formation in situ under optimal conditions, allows to eliminate heavy metals like the evaluated ones of watery means, with efficiencies superiors to 98%. Also hey are managed to obtain defined stoichiometries that allow to propose the reaction mechanisms which they take place, every time they can be justified from the obtained stoichiometries and by the different techniques used in its characterization. They have been possible to explain the mechanisms of substitution of the Fe²⁺ ions by bivalents metals like studied in the inverse spinel structures of these ferrites and their correlation with the magnetic properties of the same.

Palavras-chave : Spinels; Ferrous Ions; Crystalline Field; Hydrochemical Route.

        · resumo em Espanhol     · texto em Espanhol     · Espanhol ( pdf )