Sj. Morrison et al., ADSORPTION OF URANIUM(VI) ON AMORPHOUS FERRIC OXYHYDROXIDE AT HIGH-CONCENTRATIONS OF DISSOLVED CARBON(IV) AND SULFUR(VI), Journal of contaminant hydrology, 17(4), 1995, pp. 333-346
Citations number
20
Categorie Soggetti
Water Resources","Environmental Sciences","Geosciences, Interdisciplinary
Amorphous ferric oxyhydroxide is being used to treat groundwater conta
minated with uranium(VI); the compound also has potential for use as a
component in in situ chemical barriers. To quantitatively evaluate it
s effectiveness in such applications, adsorption of uranium(VI) onto a
morphous ferric oxyhydroxide was experimentally investigated under a w
ide range of uranium(VI) (8.40.10(-7)-2.10.10(-3) mol L-1; 0.2-500 mg
L-1), sulfur(VI) (0-0.07 mol L-1; 0-2240 mg L-1) and carbon(IV) (0-0.0
195 mol L-1; 0-234 mg L-1) concentrations, and pH-values (4-9.6). The
adsorption behavior of uranium(VI) (uranyl ion and its complexes) is s
imilar to that of other cations; it exhibits a sharp rise in the exten
t of adsorption with increasing pH. Interactions among uranyl complexe
s and surface sites are interpreted using a site complexation model. A
lthough the model does not incorporate electrostatics and includes onl
y a single type of adsorption site, it provides a reasonable match to
measured adsorption and proton exchange data. The simplicity of the mo
del and the resulting reduction in computational demand allow its effi
cient incorporation into coupled reaction-transport models.