Studies of the selective adsorption of anions by metal ion loaded ion-exchange resin. VI. The adsorption behavior of the phosphate ion on the iron(III) loaded ion-exchange resin.

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Adsorption isotherms for the phosphate ion by various iron(III)-loaded ion-exchange resins(IRC-Fe(III)), which are different in iron(III)-ion concentrations, were prepared at 5–35 °C in aqueous systems with pH values of 3 and 4.6 by means of the batch method. These isotherms could be represented by the Cp=Q∞(Cp⁄Q)−1⁄K equation in the phosphate-ion-concentration range from 3.23×10−4 to 3.23×10−2 mol dm−3 (10 ppm to 1000 ppm as P), where Cp and Q are the phosphate-ion concentrations of the aqueous phase and the adsorbent respectively; Q∞ is the saturated phosphate concentration of the adsorbent, and K is the equilibrium constant. From the analysis of adsorption isotherms, the values for Q∞ and K were determined on each adsorbent, and the nature of the adsorbent IRC-Fe(III) was discussed, with consideration paid to these two parameters and the pH-dependency of the distribution ratio of the phosphate ion between the aqueous phase and the adsorbent.
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