2.2.3. Dilute sulfuric acid–sodium hydroxide pretreatment
(H2SO4–NaOH)
Corncob was treated with 2% H2SO4 at a ratio of 1 g solid per
10 mL liquid and heated at 121 C for 45 min. After treatment,
the solids were separated by filtering, washed with tap water until
neutral and then treated with 2% NaOH at 80 C at a ratio of 1 g original
raw material to 6 mL liquid. The solids were separated by filtering
and washed with tap water until neutral. The solid residue
was dried in a forced-air oven at 105 C