As we get the BET isotherm graph and the BJH plot for analyzing the specific surface area and the pore size distribution. Is there any possible way to derive both these values from the graph plotted? I am asking this from an XRD analysis point of view, where we can see the graph and tell the crystallinity of a material from its FWHM.
Hi,
By glancing at the BET isotherm graph, it is impossible to determine the material's particular surface area and pore size. Both characteristics are numerical or quantitative, therefore determining the exact specific surface area and pore size will necessitate some calculations. To accomplish that calculation, you'll need to be able to extract the linear range of the isotherm, compute the monolayer capacity, and know the mass of the sample that was studied and the type of gas adsorbed.
However, by examining the shape and type of isotherm on the graph, you may determine if the sample will have micropores, mesopores, macropores, or a combination of pores.
The observation of adsorption isotherm will give you an idea of the nature of the porosity of your materials (micro, meso, macro or non-porous materials). effectively; you can from the isotherm and using the single-point method determine the quantity adsorbed per monolayer but the result is always relative. unlike XRD, in BET you will need values that you cannot get just by observing the adsorption isotherm.
good luck@Rajalakshmi Rajendran
Yes, The specific surface area and the pore size distribution can be determined from just looking at the BET isotherm graph.
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