Since BET and TGA both are very costly instruments and many places the facilities are not available (for large number of samples) hence a threshold degassing temperature and time is preferable
https://www.researchgate.net/publication/381487725_Simultaneous_removal_of_Ni2_and_Congo_red_from_wastewater_by_crystalline_nanocellulose_-_modified_coal_bionanocomposites_Continuous_adsorption_study_with_mathematical_modeling
Please take a look on it.
You find your answer in the following great publication: Article Biochar total surface area and total pore volume determined ...
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