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The Freundlich isotherm model relates to the adsorption of the substance on a multilayer surface. The Freundlich isotherm constants obtained graphically are shown in Table 2. The adsorption intensity value of 1.17 indicates that the adsorption process is favorable; new adsorption sites appeared and the adsorption capacity also increased. With the Freundlich isotherm as a desirable model, this suggests that the adsorption occurred at the multilayer surface of the MISCBA. The larger value of n (smaller value of 1/n) indicates that there is a strong interaction between the zinc ions and the MISCBA. The high correlation value of 0.99 explains that the MISCBA has a heterogeneous surface (Figure 1(a)). This is the common value usually obtained, and can be linked to other factors that lessen the relationship between the adsorbent and adsorbate while enhancing the surface density (Reed & Matsumoto 1993).

Table 2

Freundlich and Langmuir isotherm constants

Langmuir isothermFreundlich isotherm coefficients
k b R2 RL KF R2 n 
28.6 0.09 0.92 0.1 8.76 0.99 1.17 
Langmuir isothermFreundlich isotherm coefficients
k b R2 RL KF R2 n 
28.6 0.09 0.92 0.1 8.76 0.99 1.17 

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