Abstract

The two-layer surface complexation model combined with the Gouy−Chapman model (SCGCM) was applied to describe and predict experimental data for cation adsorption and exchange on a synthetic resin. Knowledge of the surface properties of the sulfonate macroreticular cation-exchange resin was incorporated in the model. The data set included single, binary, and ternary cation adsorption involving Na, Mg, and Zn in single anionic media of chloride, perchlorate, and sulfate at 0.05 and 0.2 N in total cation concentration (TCC) and in their 1:1 binary mixtures at TCC = 0.05 N. The SCGCM exhibited reasonably good agreement with binary and ternary cation exchanges in the different anionic backgrounds and ionic strengths, based on constants extracted from fits of single cation adsorption data and a small set of binary exchange data. Specific adsorption was predicted to be dominant for the cation adsorption and exchanges on the resin studied in this work. Na was specifically adsorbed on the sulfonate group of the re...

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