The prerequisite of degassing the biomass for N2 adsorption in
Brunauer–Emmett–Teller (BET) method has the potential to
disturb the surface properties and may lead to unreliable results.
Therefore, adsorption of dissolved molecules, like methylene blue,
from aqueous solution and fitting with the Langmuir isotherm provides
an alternative method for estimating specific surface area of
porous solids