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The Freundlich adsorption isotherm describes the heterogeneous surface energy by multilayer adsorption and is expressed in linear form (Equation (6)):
formula
6
where equilibrium concentration (mg L–1), amount adsorbed at equilibrium (mg g–1), partition coefficient (mg g–1) and intensity of adsorption. The Freundlich adsorption isotherm constants for As, B, Cr, Mo and Se onto Fe3+ modified bentonite clay is shown in Table 4.
Table 4

Freundlich adsorption isotherm constants for adsorption of As, B, Cr, Mo and Se onto Fe-Bent

 AsBCrMoSe
n–1 1.84 1.58 2.77 3.25 1.75 
Kf (mg g–10.90 0.93 0.89 0.79 1.43 
R2 0.93 0.92 0.98 0.87 0.95 
 AsBCrMoSe
n–1 1.84 1.58 2.77 3.25 1.75 
Kf (mg g–10.90 0.93 0.89 0.79 1.43 
R2 0.93 0.92 0.98 0.87 0.95 
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