An expanded Markham and Benton approach to describe multi-component adsorption of sugars on zeolite beta

Abstract

Abstract Single- and multi-component adsorption isotherms of sorbitol, fructose, and glucose on zeolite beta (Na+BEA 150) were determined in sodium phosphate buffer using batch experiments. The standard Markham and Benton approach to predict binary isotherms from single-component data significantly overestimated the loading at high concentrations of two or more compounds. Therefore, an interaction parameter was introduced to the Markham and Benton model describing mutual blocking of binding sites in binary mixtures at high concentrations. With these changes, the expanded model was able to describe the multi-component isotherms of different binary mixtures in the concentration range from zero to 100\u202fg/L for each compound. Moreover, the interaction parameters determined from binary isotherm data were used to predict ternary isotherms and a good agreement between model and experiments was achieved.