I am trying to use the linear form of Redlich-Peterson isotherm to fit my adsorption data i.e. ln((ACe/Qe)-1) = g lnCe + lnB. In this isotherm along the x-axis we have ln Ce and along the y-axis we have ln((ACe/Qe)-1). Unlike other adsorption isotherms where we simply operate on Ce and Qe, in this case we need a parameter A along with Ce and Qe. I am not sure how to find this A. Can anyone suggest me a suitable way to fit this isotherm?
Dear Selvaraju, please provide detail of this method step by step. If you have any document related to this then kindly provide.
You load solver add-in to your Microsoft Excel using the link below:
http://office.microsoft.com/en-in/excel-help/load-the-solver-add-in-HP010021570.aspx
Solver tutorial can be had from the link below:
http://www.excel-easy.com/data-analysis/solver.html
If you have any doubt, please call me at +91-94861-59667
Hello,
For a linear fitting of Redlich-peterson isotherm to the experimental data to obtain a linear plot of ln(A(Ce/qe)−1) vs. lnCe, various constant (A) values must be tried (By trial and error) before the optimum line is obtained. After obtaining the optimum line, you must calculate the other constants.
The range of(A) values is wide, from 0.01 to several hundred, so it is not easy to obtain the correct value.
Fortunately, there is a new simple linear form of Redlich-peterson isotherm published recently by Feng and al, 2010. « A new linear form analysis of Redlich–Peterson isotherm equation for the adsorptions of dyes » Chemical Engineering Journal 162 (2010) 21–27.
Obtaining the best fit for R-P isotherm with trial and error is not too hard. However, the best fit with the data may not be the correct one, as two and more parameters equations could have more than one answer. So, your given best fit may result in ineligible values for the parameters. I suggest be careful about the results.
You can try the linear equations presented in the following paper
Article A new linear form analysis of Redlich–Peterson isotherm equa...
You can also use excel solver for non-linear fitting
Also you can take a look at this paper:
Article Application of agricultural wastes of rice to lead removal f...