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Ranking of seven equilibrium isotherm models with various numbers of parameters (Langmuir, Freundlich, Redlich–Peterson, Sip, Langmuir–Freundlich, Fritz–Schlunder-3 parameter and Fritz–Schlunder-4 parameter) for the adsorption of Cu²⁺ and Cd²⁺ onto Bentonite and modified Bentonite clay was done using the small-sample-corrected Akaike information criterion (AIC_c). It was observed that the Freundlich model ranked first among the adsorption isotherm models considered. In most cases, using the AIC_c, the Langmuir model was ranked the second best isotherm model. Modification of Geothite, Humic acid, and Goethite+Humic acid with increase in temperature was observed to affect the Relative Akaike Weight (RAW) which describes the performance of adsorption models relative to the adsorption model with the minimum AIC_c estimate. The AIC_c was found to rank adsorption isotherm models better than …