BJH is considered as an effective method for calculating pore size diameter and volume. I have received BJH adsorption and desorption values separately as written below.
BJH desorption: 3.42111
BJH adsorption: 3.06625
So, I was wondering, if I have to report the pore diameter,
i)should I subtract adsorption value from desorption value?
ii) should I add the two and take average?
I have read so many papers but not getting any answers.
Thanks for help.
Generally, the BJH equation can be applicable for adsorption as well for desorption branch of isotherm, but usually the results of treatment of desorption branch is taken. So you can take the value of diameter of 3.4 nm (not more digits!) as right. The most of companies producing equipments for physical adsorption of nitrogen introduce into software both types of pore size distribution calculation (from adsorption and desorption branches), but generally the results from desorption branche are taken.
Dear Abhishek Bhapkar
Probably this discussion can be helpful for you.
https://www.researchgate.net/post/whats_the_difference_of_using_either_desorption_or_adsorption_data_for_BJH_method_pore_size_distribution