How do I interprete B and AT for metal adsorption? I found B and AT value 1.05 and 49.08 respectively. please tell the importance of the above mentioned parameters in biosorption?
Dear Mr. Rabbul,
As indicated before b is related to heat of adsorption. i.e. b= ∆Q=-∆H.
If (b) has a positive value that means your adsorption process is exothermic one. Otherwise (if it has a negative value), it is endothermic.
Dear Mr. Rabbul Ibne A. Ahad, the derivation of the Temkin isotherm assumes that the fall in the heat of sorption is linear rather than logarithmic, as implied in the Freundlich equation. The adsorption experiment data were analysed by Temkin isotherm model in the linearised form,
qe = B ln Ce + B ln A
where B = RT/b, b is the Temkin constant related to heat of sorption (J/mol), A is the equilibrium binding constant corresponding to the maximum binding energy (L/g), R is the gas constant (8.314 J/mol K), and T is the absolute temperature (K).
Dear Mr. Rabbul,
As indicated before b is related to heat of adsorption. i.e. b= ∆Q=-∆H.
If (b) has a positive value that means your adsorption process is exothermic one. Otherwise (if it has a negative value), it is endothermic.
Thank you sir Hossam Altaher, Your information is very much useful for me.
Thank you Professor Hossam Altaher for your valuable information; however, I am wondering do you have references for this. I do appreciate that.
Regards,
@ Hossam Altaher
Mostafa
Dear Dr Mr Rabbul
if b is positive the adsorption process is endothermic
if b is negative the adsorption process is exothermic
Best,
Karim.
Dear Karim Mellah thank you for valuable information.....Did you have any reference for this statement...If yes then please send...Thanks
According to this article:
if b is positive the adsorption process is endothermic
hope it helps.
Dear Mr Rabbule
There is often a confusion about the sign and significance of b in the Temklin equation (which is initially obtained by degree of coverage θ calculation, where b=ΔQ=-ΔH, ΔQ is the variation of adsorption energy).
If ΔQ is positive (which means that the slope is positive when we plot the linearized Temklin equation) the ΔH is negative and the adsorption is exothermic (as previously noticed by Mr Hossam Altaher).
This is a good article about that:
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