In Table 2, the parameter values of the applied isotherms, the
related correlation coefficient R
2
and average relative error (ARE)
are reported. As can be seen, the Langmuir model showed the
higher R
2
value (0.9927) and the lowest ARE, suggesting that this
model yielded the best fit compared to other models. By using the
Langmuir isotherm it is possible to predict whether an adsorption
system is favorable or unfavorable through a dimensionless con-stant referred to as separation factor RL defined by the following
Eq