Where Kf is the Langmuir constant and Ce is the final concen-tration of metal ion. Langmuir isotherm is irreversible when RL= 0, favourable when 01 indicates unfavourable. And in this case, Langmuir iso-therm is favourable as RL is 0.966 and 0.954 for Cd and Fe respectively as shown in figure 3, 4; 5, 6 and Table 3.
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