Sorption and chemical stability of As(V) onto tin doped goethites

A.L. LARRALDE; A.E. TUFO; E.E. SILEO

Capital Federal

Congreso; 5th International Congress on Arsenic in the Environment (As2014); 2014

5th International Congress on Arsenic in the Environment (As2014)

The effect of Sn(IV)-for-Fe(III) substitution on the adsorption of As(V) and on the reactivity in acid media werestudied for pure and Sn-substituted goethites. Adsorption isotherms indicated that the As adsorption increases in the Sn-goethitesalmost duplicating the value of pure goethite. Dissolution experiments showed sigmoidal curves with K rate values that decreasedwith the Sn(IV) incorporation. The results indicate that the Sn-for-Fe substitution enhances the adsoption of As(V) and stabilizesthe oxide towards dissolution in acid media, confirming the usefulness of Sn-goethites in removal technologies