Study on Dissolution and Modification of Cotton Fiber in Different Growth Stages

Abstract

Cotton fibers with ultra-high purity cellulose are ideal raw materials for producing nanocellulose. However, the strong hydrogen bond and high crystallinity of cotton fibers affect the dissociation of cotton fibers to prepare nanocellulose. The structures of two kinds of cotton fibers (CM and XM) in different growth stages from 10 to 50 days post-anthesis (dpa) were studied by Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD). In the process of cotton fiber growth, the deposition rate of cellulose macromolecules firstly increased and then stabilized. Then, the surface morphology, the chemical composition, and the crystal structure of the nanocellulose prepared from cotton fibers with different growth stages by deep eutectic solvent, a green solvent, were characterized by Transmission Electron Microscope (TEM), scanning electron microscopy (SEM) analysis, XRD, and Thermo Gravimetry (TG). The growth time of cotton fibers affected the properties of prepared nanocellulose, and nanocellulose obtained from cotton fibers at about 30 dpa had less energy consumption, higher yield, and milder reaction conditions.

Using deep eutectic solvent dissolved low-value cotton linter based efficient magnetic adsorbents for heavy metal removal

“…The cotton linter (CL) exhibited obvious diffraction peaks at 14.9°, 16.5°, 22.7°, and 34.4°, which indicated that the natural cotton fibers used in the experiment had the typical cellulose type I crystal structure. 45 The characteristic peaks of Fe 3 O 4 /CL were mostly coincident with CL, which was due to the low loading of Fe 3 O 4 on untreated CL and the limitations of XRD. Interestingly, only the characteristic peaks of cellulose could be observed for Fe 3 O 4 /CL-O, which may have been related to the high dispersion of Fe 3 O 4 on the surface of CL-O, and this phenomenon was confirmed by SEM ( Fig.…”