such as limited dissolving capability, toxicity, high cost,
solvents recovery, uncontrollable side reaction, and instability
during cellulose processing and/or derivatization. The
recently developed Lyocell process [11], which uses Nmethylmorpholine
N-oxide (NMMO) to dissolve cellulose
directly, also has some disadvantages including the formation
of byproducts, the degradation of cellulose, and high cost
[12]. In recent years, Zhang et al. [13, 14] have developed
a green and efficient method for dissolution of cellulose in
NaOH/urea aqueous solution, in which the cellulose can
be rapidly dissolved as precooled to −12∘C within 2min.
However, the dissolution process is limited in terms of cellulose
concentration and degree polymerization (DP). More
recently, ionic liquids (ILs) have attractedmuch attention due
to their high electrochemical and thermal stability, nonflammability,
and tunable solubility properties [15]. Ionic
liquids are often fluid at room temperature and consist
entirely of ionic species and represent a new class of solvents