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Considering the results obtained in the section ‘Equilibrium study’, only the Langmuir isotherm is tested to model the experimentally obtained data. Langmuir equation constants are listed in Table 4.

Table 4

Thermodynamic parameters for Ni(II) and Cd(II) adsorption

Metal ionsTemperature (K)KaΔGo (kJ·mol−1)ΔSo (kJ·mol−1·K−1)ΔHo (kJ·mol−1)r2
 298 1.168 −0.385 0.0482 13.98 0.9788 
Ni(II) 306 1.633 −1.276 0.0488 
 313 1.953 −1.825 0.0482 
 298 2.748 −2.505 0.0371 8.55 0.9808 
Cd(II) 306 3.122 −2.963 0.0368 
 313 3.772 −3.621 0.0371 
Metal ionsTemperature (K)KaΔGo (kJ·mol−1)ΔSo (kJ·mol−1·K−1)ΔHo (kJ·mol−1)r2
 298 1.168 −0.385 0.0482 13.98 0.9788 
Ni(II) 306 1.633 −1.276 0.0488 
 313 1.953 −1.825 0.0482 
 298 2.748 −2.505 0.0371 8.55 0.9808 
Cd(II) 306 3.122 −2.963 0.0368 
 313 3.772 −3.621 0.0371 

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