I have got y= 2.3314x - 3.2633 and R² = 0.9523
is this value valid or not for a linear fitting of Langmuir isotherm of methylene blue
Given Langmuir's equation in the form q=qmax*b*C/(1+b*C), the linear form will be 1/q = 1/(qmax*b)*1/C + 1/qmax. Therefore, if the intercept is negative, it means that qmax and b must be negative. Of course, that has no physical meaning within the frame of the Langmuir hypothesis.
It seems that you are fitting an unfavourable isotherm (i.e., concave) to the Langmuir model (convex and with an horizontal asymptote at q=qmax).
Check again the optimal conditions of adsorption, and repeat the experimental studies. The value of qmax cannot be negative.
Anifat Bankole, There is nothing to interpret here. The obtained equilibrium curve is not a saturation curve. This could be a measurement or computation error, it could be due to unidentified side effect/s. And that's it.
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