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The calculated isotherm parameters for each model and the correlation coefficients estimated by the nonlinear regressive process are summarized in Table 3. The table shows that the best fit of experimental data was obtained with the Langmuir model. The maximum Langmuir monolayer adsorption capacities were 2,758, 1,622 and 800 mg/g, respectively, for Zn-Al-Cl, Mg-Al-Cl and Ni-Al-Cl. This result was in agreement with XRD analysis, which demonstrated that Zn-Al-Cl presents a high interlayer distance.

Table 3

Isotherm constants for MO adsorption by LDHs

 Langmuir model
Freundlich model
Adsorbentqm (mg/g)KL (L/mg)r2KF (mg/g)(L/mg)1/nnr2
Zn-Al-Cl 2,455.31 0.0103 0.985 295.75 3.260 0.926 
Mg-Al-Cl 1,456.55 0.0225 0.951 371.59 4.918 0.909 
Ni-Al-Cl 574.34 0.0180 0.992 169.97 5.698 0.962 
 Langmuir model
Freundlich model
Adsorbentqm (mg/g)KL (L/mg)r2KF (mg/g)(L/mg)1/nnr2
Zn-Al-Cl 2,455.31 0.0103 0.985 295.75 3.260 0.926 
Mg-Al-Cl 1,456.55 0.0225 0.951 371.59 4.918 0.909 
Ni-Al-Cl 574.34 0.0180 0.992 169.97 5.698 0.962 

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