Abstract
This study examined the interactions of MoO 4 2−+SO 4 2−, MoO 4 2−+SeO 4 2−, and MoO 4 2−+SeO 3 2− systems on γ-Al 2O 3 to better understand the competitive adsorption of these anions in the natural environment. The Freundlich isotherms of anionic adsorption onto γ-Al 2O 3 in single and binary solutes were also investigated to estimate the competition between these anions. Experimental results indicate that a higher concentration of competitive solute yields a higher efficiency of the competitive solute's prevention of MoO 4 2− adsorption. The most significant result was found in the MoO 4 2−+SeO 3 2− system. The Freundlich isotherm constant ( n) increases with the competitive solute concentration. The suitability of a Freundlich-type isotherm, the Sheindorf–Rebuhn–Sheintuch (SRS) equation, and the modified SRS equation in representing the competitive adsorption of MoO 4 2−, SO 4 2−, SeO 4 2−, and SeO 3 2− on γ-Al 2O 3 surface, was also examined. Each set of isotherm data was found to conform to linear SRS expressions, allowing competition coefficients to be derived on a concentration basis for each binary-solute system. The competition coefficient a ij and relative affinity coefficients α ij can be seen as a way to quantify competitive interactions. The proposed SRS and modified SRS equations are simple mathematical expressions accounting for competitive interactions of anions present in a mixture for the range of concentrations over which each individual component exhibits Freundlich behavior.
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