INVESTIGADORES
LITTER marta Irene
artículos
Título:
Photodissolution of iron oxides in malonic acid
Autor/es:
M.I. LITTER; M. VILLEGAS; M.A. BLESA
Revista:
CANADIAN JOURNAL OF CHEMISTRY
Editorial:
NATL RESEARCH COUNCIL CANADA-N R C RESEARCH PRESS
Referencias:
Lugar: Otawa; Año: 1994 vol. 72 p. 2037 - 2043
ISSN:
0008-4042
Resumen:
The influence of 254-nm irradiation on the dissolution rate of magnetite (Fe304) and maghemite (y-Fe203) suspended in aqueous solutions of malonic acid is analyzed and compared with the dark reaction. The effect of the addition of Fe3+, reductants such as ascorbic acid and oxidants such as Ag+ or O2 is described. Photochemical initiation involves the production of >~e" by electrons photogenerated on the oxide, which triggers thermal dissolution. Experimental results are fitted by analytical and numerical solutions of the set of kinetic equations. The calculated fitting parameters reflect the lower activity of iron oxides in malonic acid compared to EDTA media.
