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As mentioned above, Langmuir and Freundlich adsorption isotherms were employed to describe the mechanisms of oxyanion sorption onto Fe-bent. In this study, correlation coefficient (R2) values were used to determine the best fitted model between the two. The Langmuir model is expressed by the equation:
formula
4
where equilibrium concentration (mg L–1), amount adsorbed at equilibrium (mg g–1), Langmuir constants related to adsorption capacity (mg g–1) and Langmuir constants related to energy of adsorption (L mg–1). These parameters are listed in Table 3.
Table 3

Langmuir adsorption isotherm constants for adsorption of As, B, Cr, Mo and Se onto Fe3+ modified bentonite clay

 AsBCrMoSe
Qm (mg g–130.10 24.20 89.30 68.50 63.30 
b (L mg–10.03 0.04 0.01 0.01 0.02 
RL 0.66 0.61 0.86 0.82 0.81 
R2 0.85 0.82 0.60 0.88 0.81 
 AsBCrMoSe
Qm (mg g–130.10 24.20 89.30 68.50 63.30 
b (L mg–10.03 0.04 0.01 0.01 0.02 
RL 0.66 0.61 0.86 0.82 0.81 
R2 0.85 0.82 0.60 0.88 0.81 
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