I am currently working on the adsorption of heavy metal and have been able to compute the amount of metal adsorbed (mg) per gram of the adsorbent (Qe) against the concentration of metal used in the assessment (Ce) at equilibrium. However, the graphical plots for the non-linear modelling of various isotherms (Langmuir, Freundlich, Temkin, DR etc), all seem to bank on the correlation between the parameters Qe and Ce although with different fit profiles for each of the isotherms. I shall be highly obliged if anyone could explain how is this achieved? Furthermore, how are the values for the constants in the various adsorption isotherms determined?
Dear Bikash,
I think, I am able to solve your problem(s). I have few queries regarding this problems. (1) Which software you used for modeling ?
You may go through my publications, full texts are also available in Research Gate.
Have you tried direct use of nonlinear regression? There is a version available in excel, but without the ability to provide error bound estimates for the parameters.
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