In this study

three kinds of ionic liquid

including 1-butyl-3-methylimidazolium chloride ([Bmim]Cl)

1-butyl-3-methylimidazolium bromide ([Bmim]Br) and 1-octyl-3-methylimidazolium chloride ([Omim]Cl)

were selected to pretreat the lignocellulosic parts of oilseeds: peanut husk

peanut straw and cole straw. The untreated and pretreated materials were investigated through the compositional

enzymatic hydrolysis and structural analysis. Among the untreated materials

peanut straw with the highest sugar yield 54.31% and the lowest lignin content was considered as the preferable substrate for biofuels production. After ionic liquid pretreatment

the effect of [Bmim]Cl on sugar yield was more significant

which lead to 85.43% sugar yield for peanut straw. The structural changes were also analyzed by scanning electron microscope (SEM) and Fourier transform-infrared (FT-IR). Among the raw materials

peanut straw’s morphological structure was distinctive with broken surface

incompact structural and lower crystallinity. After pretreatment

all material turned to be more porous and rough than before. On the basis

the mechanism of lignocellulose’s dissolution by ionic liquid with different cation and anion were also discussed. The results showed that the chlorine and [Bmim]+ were vital on the effect of ionic liquid pretreatment.