Prediction of multicomponent adsorption equilibrium data using empirical correlations

In this study, extended empirical Langmuir, Freundlich and Redlich-Peterson formulate have been applied for the calculation of multicomponent adsorption equilibrium data for all combinations of three basic dye systems: Basic Blue 69 (B), Basic Red 22 (R) and Basic Yellow 21 (Y) on Activated Carbon (F400). Extended Langmuir application yielded average variances (σ²) of 3.3%, 589%, 51% and 47% for RY, RB, YB and RYB system components respectively. The Redlich-Peterson relationship gave σ² of 8%, 62%, 50% and 44% respectively. Introducing an interaction term (η) lowered σ² to 0.5%, 23%, 16% and 11% for RY, RB, YB and RYB system components respectively for the Langmuir formula and to 0.4%, 21.3%, 15% and 11% respectively for the Redlich-Peterson equation. The Freundlich empirical extended formula for bisolute systems produced variances of 0.69%, 9.1% and 8.8% for RY, RB and YB system components respectively. The latter formula is the most accurate for bisolute systems as it is obtained by single and multisolute correlation of all constants in the formula.