Results: From the attenuated total reflectance Fourier transform-infrared (ATR FT-IR) spectroscopy, X-ray diffraction
(XRD) and scanning electron microscopy (SEM) results, the regenerated cellulose were more amorphous, less
crystalline, and possessed higher structural disruption compared with untreated rice husk. The major component of
regenerated cellulose from [BMIM]Cl and [EMIM]DEP pretreatments was cellulose-rich material, while cellulose
regenerated from [EMIM]OAc was a matrix of cellulose and lignin. Cellulose regenerated from ionic pretreatments
could be saccharified via enzymatic hydrolysis, and resulted in relatively high reducing sugars yields, whereas
enzymatic hydrolysis of untreated rice husk did not yield reducing sugars. Rice husk residues generated from the
ionic liquid pretreatments had similar chemical composition and amorphousity to that of untreated rice husk, but
with varying extent of surface disruption and swelling.