Fig. 4.
Effect of PAA and IL pretreatments on structural changes in cellulose content of SWBC. (a) FT-IR analysis and (b) XRD analysis. Numbers on right vertical axis show: 1 = untreated SWBC, 2 = pretreated with PAA, 3 = PAA + [Hpy][Cl], 4 = PAA + [Emim][DEP] and 5 = PAA + [Emim][OAc]. The pretreatment times were 3 h and 30 min, respectively for PAA and IL.