Skip to Main Content
Linearized forms of Langmuir and Freundlich isotherms for the adsorption of aniline onto AC coated by chitosan are shown in Figures 10 and 11. The Q, b and RL values for the Langmuir isotherm, the Kf and 1/n values for the Freundlich isotherm and the correlation coefficients of equations are shown in Table 2. Results show that the Freundlich equation gave a better fit than the Langmuir equation according to their correlation coefficients. The Langmuir isotherm equation did not better fit the experimental data, probably due to the heterogeneous distribution of active sites on the surface of the adsorbent tested. The RL values lying between 0 and 1 indicated favorable conditions for the adsorption of aniline onto AC coated by chitosan at all the temperatures studied. Further, for these adsorption processes, n values have been found to vary between 2.295 and 2.372, justifying the adsorption of aniline by AC coated by chitosan as a favorable process.
Figure 10

Langmuir isotherm plots for aniline adsorption.

Figure 10

Langmuir isotherm plots for aniline adsorption.

Figure 11

Freundlich isotherm plots for aniline adsorption.

Figure 11

Freundlich isotherm plots for aniline adsorption.

Table 2

Langmuir and Freundlich isotherm parameters of aniline adsorption onto the adsorbent

IsothermsParameters293K303K313K
Langmuir isotherm 40.65 38.67 35.71 
0.039 0.037 0.040 
RL 0.093–0.561 0.097–0.572 0.092–0.558 
R2 0.9586 0.9521 0.9610 
Freundlich isotherm Kf 0.011 0.007 0.006 
n 2.295 2.318 2.372 
1/n 0.436 0.431 0.422 
R2 0.9941 0.9944 0.9952 
IsothermsParameters293K303K313K
Langmuir isotherm 40.65 38.67 35.71 
0.039 0.037 0.040 
RL 0.093–0.561 0.097–0.572 0.092–0.558 
R2 0.9586 0.9521 0.9610 
Freundlich isotherm Kf 0.011 0.007 0.006 
n 2.295 2.318 2.372 
1/n 0.436 0.431 0.422 
R2 0.9941 0.9944 0.9952 
Close Modal

or Create an Account

Close Modal
Close Modal