That is entire isotherm run for pore size, pore volume, etc. is required or just surface area value with three points is enough?
Well, It depends on what you wish to know. In principle, running a complete isotherm, you can get specific surface area, pore size distribution, pore volume and even pore-type. I am attaching a very useful and highly cited article by Leofanti et. al, describing all this. I hope it will help you.
Well, It depends on what you wish to know. In principle, running a complete isotherm, you can get specific surface area, pore size distribution, pore volume and even pore-type. I am attaching a very useful and highly cited article by Leofanti et. al, describing all this. I hope it will help you.
If you can measure a full isotherm, please do it. For the B.E.T. area i suggest to take at least seven points (ten is better) located between 0.03 and 0.3 of relative pressure of N2. TiO2 is a mesoporous material, then the isotherm could be of type II with low surface area (no more than 20 cm^2/g). I suggest to see the articles of Rouquerol about N2 adsorption, including the book "Adsorption by powders and solids...".
if you use TiO2 as catalyst support, than you need to perform a full isotherm. Pore size distribution and pore volume are very useful.
But if you use TiO2 as active phase (photocatalysis for example): B.E.T can be enough.
It depends on your application.
BR,
I like to suggest you to do full isotherm. You have to concern about the following things:
1) Specific surface area(From BET method),
2) Pore size and pore volume( From BJH method)
3) Make a plot of (dv/dlogdp) vs dp. From this plot,you have to get some idea about that pore size distribution (micropore=less than 2nm, mesopore=between 2 to 50 nm,macropore=greater than 50 nm). Where dp is the pore diameter and V is the pore volume.
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