Abstract:

Cellulose, hemicellulose and lignin contents in P.eduli.residues were determined by van's method.Cellulose in Pueraria edulis Pampan.residue was sequentially treated with sodium chlorite and sodium hydroxide as treatment reagents.Various factors including mass fraction of sodium chlorite and sodium hydroxide, reaction temperature and reaction time were optimized.In addition, the morphology, crystal structure, chemical structure, and thermal stability of P.edulis residue, P.edulis residue after chlorite treatment, and P.edulis cellulose (P.edulis residue after further treatment with sodium hydroxide) were characterized by scanning electron microscopy (SEM), X-ray powder diffraction (XRD), Fourier transform infrared spectrum (FT-IR) and differential thermal gravimetric analysis, respectively.The results demonstrated that the content of cellulose in original P.edulis residue was 59%, which was increased to about 84% after treatment by 4% sodium chlorite at 100℃ for 120 min, and could further reach 94% after treated by 15% sodium hydroxide at 80℃ for 120 min.Ultimately, the crystal texture of P.edulis cellulose was ascribed to cellulose Ⅰ with the crystallinity of 71.5%.The maximum pyrolysis temperature of P.edulis cellulose was determined as 356℃, strongly demonstrating its good thermal stability.

Key words: Pueraria edulis Pampan. residue, process optimization, cellulose