Table 2: Pure Tyr equilibrium isotherm models and fitting parameters.

ModelEquationParameter values RMS (%)

Langmuir 0.9920.9960.9958.4433.6054.226

Freundlich 0.9840.9590.97015.51412.14011.239

Temkin 0.9910.9940.9993.3504.2911.417

Langmuir-Freundlich 0.9980.9980.9961.7632.7663.722

(mg g−1) is the equilibrium adsorption capacity; (mg L−1) is the solute concentration in the aqueous solution, after equilibrium; (mg g−1) is the maximum adsorption capacity; the remaining constants are empirical parameters associated to each specific model.