Abstract
Competitive adsorption of molybdate, selenite, selenate, chromate, and sulfate onto γ-Al 2O 3 was investigated in the present study. Binary-solute systems of MoO 4 2−/SeO 3 2−, CrO 4 2−/SO 4 2−, and CrO 4 2−/SeO 4 2− as well as single anion systems were evaluated for the relative influence on competitive adsorption on oxide surface. As would be expected, the adsorption density of each anion in the binary-solute systems decreases, as compared to the respective density in a single anion system. Furthermore, MoO 4 2− inhibits SeO 3 2− adsorption in acidic condition and that SO 4 2− or SeO 4 2− depresses CrO 4 2−. The order of the relative retainment of anions on oxide surface is molybdate>selenite>selenate∼sulfate>chromate, which corresponds to the magnitude of the overall proton coefficient of the corresponding anions.
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