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Table 4 Relative fractions of the C and O contributions derived from peak fitting of high-resolution C 1 s and O 1 s XPS spectra

From: Overcoming biomass recalcitrance by synergistic pretreatment of mechanical activation and metal salt for enhancing enzymatic conversion of lignocellulose

Sample Relative fraction of C (%) Relative fraction of O (%)
C1 C2 C3 O1 O2
Untreated lignin 66.99 31.12 1.89 5.66 93.34
MA-pretreated lignin 60.55 36.33 3.12 8.09 91.91
MA + AlCl3 pretreated lignin 60.61 33.94 5.45 14.16 85.84
MA + FeCl3 pretreated lignin 60.94 34.98 4.08 10.15 89.85
MA + Al(NO3)3 pretreated lignin 60.45 35.31 4.24 10.87 89.13
MA + Fe(NO3)3 pretreated lignin 59.98 35.12 4.90 12.28 87.72