The Freundlich isotherm equation was developed based on the assumption that the surface is heterogeneous; that is, the adsorbent-adsorbate interaction energy is distributed and the surface is grouped into various patches with each patch having its own adsorption energy.
The correlation between [D.sub.e] and the equilibrium adsorption loading of C[O.sub.2] (qe) can now be obtained by converting the pressure to qe via the Freundlich isotherm equation and the results are delineated in Figure 9.
The linearized Freundlich isotherm equation is defined as follows:
The data from these studies were fitted to the Langmuir and Freundlich isotherm equations.
The Freundlich isotherm equation
is represented by the following equation (Tsai et al.
As shown in Table 1, it can be seen that the values of linear regression coefficient ([R.sup.2]) are situated within the range of 0.983-0.998, demonstrating that the experimental data fitted well with the Freundlich isotherm equation
. Moreover, it was reported [5, 10] that the Freundlich isotherm constant can be used to explore the favourability of adsorption process.
The Freundlich isotherm equation was also the best fitting model to describe adsorption of tetracycline on the SOM-free soils.
The Freundlich isotherm equation which resembles the S-type curve was the best fitting model for the 2 soils whether SOM was removed or not.
The linear form of the Freundlich isotherm equation
can be written as:
R-P isotherm equation amends inaccuracies of Langmuir and Freundlich isotherm equations
. The values of bR were high, up to 6.59-10.09.
This isotherm is a combination of Langmuir and Freundlich isotherm equations
, deduced for predicting the heterogeneous adsorption systems and to overcome the limitation of the rising adsorbate concentration associated with Freundlich isotherm model.
The equilibrium data of Cr(III) could be described by the Langmuir and Freundlich isotherm equations
. However, the Langmuir model better represented the sorption process than the Freundlich model.