I have applied both pseudo first and pseudo second order linear models on my data. Calculated and experimental qe values of pseudo first order are very near to each other. However, in pseudo second order there is striking difference in qe values of experiment and the ones calculated from graph. How can I justify this occurrence? Also R2 value is very good even in Pseudo second order.
Can anyone please assist me to remove this confusion??
Hi
First , I advice to use nonlinear modeling over linear one
2nd, could you please clarify your worry again? And is this adsorption modeling?
Ismail Badran Yes, I am working on adsorption kinetics. I applied both pseudo first and pseudo second kinetics on my data. Calculated Qe for Pseudo first is quite near to the experimental one. However, there is a great difference between the qe values of pseudo second order modelling. Meanwhile, R2 values of both models are good, around 0.9.
0.9 is not a good R^2 value
What is exactly ?
Any how , if the exp Qe is closer to the 2nd order, then it is 2nd order
Again, I advice you too use the nonlinear fitting. It is more trusted
Hello
If the difference between your experimental and calculated qe is large, then maybe your adsorbent is not completely saturated and has not reached complete equilibrium. Moreover, it is better to do fitting of your kinetics data using non-linear forms of Pseudo-first-order and Pesudo-second-order models. The R2 value can confirm the better fitting; if it is close to 1, your data is better fitted to that particular model.
I faced similar problem. My R2 value is fitted better for pseudo second order, however calculated qe value is more higher than experimental for second order. In other words, R2 value is higher for pseudo second order, but qe calculated from pseudo first order is more closer to experimental. How can I deal the fact, please reply with solid statements.
You can also try other regression models. Or you can try other linear types of PSO equations. There are 6 linear PSO models in the literature. I also added two models. He came back from the referee for me to correct his English. Published soon
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