Extraction of cellulose nanofibers from paper pulp using mechanical-chemical method

In this work, we prepared cellulose nanofibers (CNF) with high length and diameter from a native source (pulp paper) after purification by chemical (removal of non-cellulosic components)/ mechanical (breaking down the fiber structures) method. Under optimal conditions, cellulose nanofibers were prepared with the best efficiency (Using a 16 wt% NaOH solution at 80 °C for 12 hours and NaClO solution for half an hours and ball-milling for 5 hours and ultrasonicated for half and hours). Fourier transform infrared (FTIR) spectroscopy and scanning tunneling microscope (SEM) tests were used in this work, indicating that the purification of cellulose and its preparation has well been performed.