Using origin pro graph software and fitting non linear curve fitting and selecting functions as required for Langmuir, Sips and D-R equation can give you the fitting of these isotherm parameters. For example, selecting rectangular hyperbola function you can determine various parameters of Langmuir equation.

Thanks @Professor Aminul. Which parameters should I plot? How do I linearize the isotherms?

I suggest to review these references : You will find several ways to linearize some isotherms and the advantages / disadvantages of linear models.

A new linear form analysis of Redlich–Peterson isotherm equation for the adsorptions of dyes, The Chemical Eng Journal 162(1); 21-27

Linearised and non-linearised isotherm models optimization analysis by error functions and statistical means, J Environ Health Sci Eng. 2014; 12: 92. doi: 10.1186/2052-336X-12-92

Applicability of some statistical tools to predict optimum adsorption isotherm after linear and non-linear regression analysis, Journal of Hazardous Materials 153 (2008) 207–212

Isotherms for the Sorption of Lead onto Peat: Comparison of Linear and Non-Linear Methods, Polish Journal of Environmental Studies Vol. 15, No. 1 (2006), 81-86.

Thanks Professor Calvis.

Can anyone suggest to find out the parameters a graph is plot between qe,i of mixture and Ce,i of first dye in a mixture solution

or

qe,i of mixture and Ce,i of individual single dye component? what is the correct formula?

These videos can answer your questions: https://www.youtube.com/channel/UC5MiS3nMoji95OZ7uE1V8qw/playlists?view=50&sort=dd&shelf_id=6