Fig. 1. Effect of H+ ions concentration on glucose production from untreated and
pretreated a-cellulose. Conditions: cellulose was first swelled in 7 wt% NaOH 20
C for 24 h and then regenerated by different concentrations of HCl with the final
concentration of H+ given in x-coordinate; the hydrolysis reaction was performed at
160 C for 10 min.