The surface physical properties of the activated carbons were
characterized with a Micromeritics ASAP 2020, using N2 as the
adsorbate at 77 K. The surface area (SBET) was calculated with the
BET equation, the pore volume (VT) was obtained from the adsorption
isotherm at P/P0 = 0.95. The micropore area (Smic) and volume
(Vmic) were obtained using the t-plot method. The mesopore volume
(Vmes) was the deduction of Vmic from VT and the mesopore
area (Smes) was the deduction of Smic from SBET.