Resumen

FLORES, M.I.; MALDONADO, M; MARTINEZ, J.M.  y  GUZMAN, J.J.. Laboratory Synthesized Spinels for Chromium Adsorption. Inf. tecnol. [online]. 2004, vol.15, n.3, pp. 85-90. ISSN 0718-0764.  http://dx.doi.org/10.4067/S0718-07642004000300014.

In this study three adsorbents including magnesium aluminate of spinel type (MgAl₂O₄), magnesia (MgO) and g -alumina (g -Al₂O₃), were obtained and characterized. These materials were evaluated for their capacity to adsorb chromium from 50 ppm solutions of K₂Cr₂O₇ in a low stirring vessel and a packed bed adsorption column. The activated magnesia showed the greatest capacity for adsorption reaching 91.66% (11 m mol of Cr/gr) in the stirred batch system over 1.5 h, while the packed bed column adsorbed only 36.67% (4.4 m mol Cr/gr). With the magnesium aluminate and the g -alumina the adsorption of chromium was lower compared with the magnesia when varying conditions of mass, pH, and temperature in the stirred batch system. It is concluded that the temperature and turbulence promoted by stirring in the batch system favored the adsorption of chromium especially in magnesia

Palabras llave : chromium adsorption; synthesized spinels; alumina; magnesia; magnesium aluminate.