What could be the possible reason for the drastic variation in Qmax value for same adsorbent onto two different cationic dyes itself?

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Nibou Djamel

Perhaps pH solution or dye affinity towards the adsorbent.

Henrik Romar

Is the porosity suitable for the size of the molecules? Or more suitable for one of them.

Anil Kumar Sakhiya

It might be due to the hydrodynamic strength, electronegativity, ionic radius and cation exchange capacity.