As the NaOH concentration increasing from 0.05 to 1.50 mol/L,
the pore volume ratio of microporous and mesoporous increased
from 0.0091, 0.0527 to 0.0778, 0.0175 cm3 g1 respectively, but the
macroporous decreased from 0.0167 to 0.0091 cm3 g1. When the
NaOH concentration increased to 3.00 mol/L, the pore volume ratio
of microporous and mesoporous decreased to 0.0071,
0.0646 cm3 g1 respectively, but the macroporous increased to
0.0204 cm3 g1.