Our recent studies showed that cellulose/lignin-based composites could be easily prepared by using [Emim][Ac]. Cellulose, lignin, and xylan were fully dissolved in [Emim][Ac] and successfully reconstituted into various gel forms such as molded shape, thin film, and microfiber [29],[30] and [31]. In addition, cellulose/lignin/starch film and lignocellulose aerogel were successfully prepared by using ILs [32] and [33]. The development of cellulose/lignin-based composites implies great opportunities to develop environmentally friendly and biocompatible materials, because of their high biocompatibility and biodegradability.