to study the adsorption kinetics of COD of wastewater by activated carbon.
the Intra-particle diffusion model was applied but we found the value C (which is related to the boundary layer thickness) is a negative value and the coefficient of regression between 0.95 and 0.99??
the C is wrong to value or no.
the equation: qt = kid t(0.5) +C
if just .what is the interpretation??
Hi !
I suggest you make a nonlinear regression, and try with Weber-Morris model too. Because your R^2 it is good, but the correlation with you data it is not, you do not have a negative C, in few words, in this case the model not match with the phenomena physic the adsorption.
Have a nice day :) !
Intraparticle diffusion kinetic model is explained herein: https://youtu.be/iwi1c_-_qyQ
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