Lignin and Cellulose Extraction from Vietnam’s Rice Straw Using Ultrasound-Assisted Alkaline Treatment Method

Figure 2

SEM of rice straw: outer layer (a), inner layer (b), cellulose fiber extracted by the ultrasound-assisted alkaline extraction method (c), and cellulose fiber extracted without ultrasound (d).

(a)

(b)

(c)

(d)