Surface area and pore structure of activated carbons (ACs) prepared from peanut shells
were estimated for seven samples of ACs variable in their activation method.
Characterization of the porous structure of these ACs was evaluated by scanning
electron microscopy and analysis of the respective N2/77 K adsorption-desorption
isotherms. Surface areas accessible to MB (SMB) =110-813 m2/g were calculated using
the Langmuir and Freundlich adsorption isotherm equations. The Langmuir adsorption
isotherm model gives better fit as compared to Freundlich model. Ratios of methylene
blue surface area to nitrogen surface area (SMB/SN2
 ) were evaluated and discussed.