Hi Bilal,
Qmax is a maximum adsoption capacity of a material, meaning how much of to-be-sorbed substance a particular adsorbent may uptake and host, i.e. how many mg of substance per g of adsorbent.
There are different sorption isotherm models available out there, which describe sorption behaviour better for different cases. Some time ago I did a little literature review on the sorption models, when I was trying to explain how zeolites adsorb arsenates from water solutions water purification purposes. Perhaps if you scroll to the sorption models, this will give you useful information on what models are out there and how you can obtain the coefficients for the model of interest. Hope this helps! Here is the link:
Chapter Use of Synthetic and Natural Zeolites Tailored for As(V) Sorption
Cheers,
Andrey
Andrey E. Krauklis
if i have more than one sorbent, and i want compare the qmax, it must to calculated from the same Co or we can calculated for the diffrent Co
Muri Yanto
Very good question, and not an easy one. The first thing to consider is that qe is linked to Ce and qmax via the isotherm equation. Different Co results in different Ce. qmax does not depend on Ce, so should not depend on Co. That's one. But...
This leads to the second thing to consider. qmax shows a correct value only when a thermodynamic saturation condition is achieved. This means that there should be a sufficiently high concentration of adsorbate in the solution (quite high Co values).
To summarize:
It is alright to compare qmax of different sorbents obtained from different Co, as long as Co are quite high (the thermodynamic saturation is ensured).
Hope this helps. Good luck!
Best Regards,
Andrey
Andrey E. Krauklis what is quite high C(0) if you could tell me. Miligram/mL nanogram/mL. Where would you draw a line?
Dear Yannik Altaner , I think it very much depends on the nature of both sorbate and sorbent that are to interact. I am not aware of a universal way to draw a line there.
This video indoduces how to compare experimental and calculated maximum adsorption capacity, qmax value in adsorption isotherm study easily! #aminulcheminnovation #AminulSir
https://youtu.be/GYCUOcpiUec
This video indoduces how to compare experimental and calculated maximum adsorption capacity, qmax value in adsorption isotherm study easily! #aminulcheminnovation #AminulSir
https://youtu.be/GYCUOcpiUec
Hi Andrey E. Krauklis , I want to ask whether or not the qmax in Langmuir equation is related to T(absolute temperature)? Conceptually, the qmax is dependent on the adsorption sites on adsorbent, if we impose high enough gas partitial pressure onto an adsorbent surface, it will occupy the whole available sites of the sorbent, right? so it should be temperature-independent in this respect. However, I found that the value of qmax are variable when drawing the isotherm under different temperature. So could you kindly help me with this question?
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