Abstract: In this study, nano-crystalline cellulose was prepared from soybean dregs (rich in cellulose) and used to investigate its physicochemical properties. Moreover, its structure was characterized using transmission electron microscope, X-ray diffractometer and comprehensive thermal analyzer. The prepared nano-crystalline cellulose was microspheres with particle size between 15 nm and 50 nm and still belonged to crystalline cellulose type Ⅰ. The crystallinity and average grain size were 43.28% and 5.9 nm, respectively. The nano-crystalline soybean dregs cellulose had higher expansive force and heavy metal ion-adsorbing capacity but lower oil-holding and water-holding capacities than the superfine soybean dregs cellulose.

Key words: soybean dregs, hydrochloric acid, nano-crystalline cellulose, property, characterization