Can anyone please tell me how to do the nonlinear kinetic plot of the pseudo second order kinetic model and elovich kinetic model using Origin 8.5?

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Yurii V Geletii

Your equation looks strange. What is qt? What is the concentration of a reactant?

Ananya Ghosh

here qt is the adsorption capacity of the adsorbent which is magnesium oxide and the initial concentration of the reactant, which is arsenic (III), is 20 mg/L. If there is anything wrong with the equation then it will be very helpful if you could rectify that and help me with the plots.

thanks.@Yurii V Geletii

Where did you take this equation from? qt is supposed to be a constant and there is no arsenic concentration in the equation.

Please see equation 10 in the attached paper. I simplified the equation and used it. The adsorption capacity of arsenic by MgO is represented by qt in the equation that I mentioned in the question. Here qe is the constant which represents the value of adsorption at equilibrium@Yurii V Geletii.

" I simplified the equation and used it. " You made a mistake in converting eq 10 to your equation. Do your job properly

Thank you for your suggestion sir, I will try to rectify my mistake.@Yurii V Geletii

Bibek Dash

Ho and McKay's pseudo-second-order kinetic model is expressed as

dqt/dt=k2 (qe-qt)^2

and the linearized form of the pseudo-second-order model is written as

t/qt = 1/(k2*qe^2) + t/qe

where qt and qe are the amounts of adsorbate adsorbed at time t and equilibrium resectively. k2 is the equilibrium rate constant in the equation.

You then need to plot t/qt vs t curve for pseudo-second-order model.

Kindly follow the paper given in reference for your better understanding.

Reference

Laxmipriya Panda, Swagat S. Rath, Danda Srinivas Rao, Binod B. Nayak, Bisweswar Das, Pramila K. Misra, Thorough understanding of the kinetics and mechanism of heavy metal adsorption onto a pyrophyllite mine waste based geopolymer, Journal of Molecular Liquids, Volume 263, 2018, Pages 428-441,

https://doi.org/10.1016/j.molliq.2018.05.016.

I am doing the non-linear plot, that is where I am facing the problem. The linear plots are already done.@Bibek Dash

Md. Aminul Islam

This video step by step shows how to fit nonlinear Elovich kinetic model in OriginPro easily! #aminulcheminnovation #AminulSir

https://youtu.be/yF80eY8j-O0