Effects of various treatments with distilled water, absolute ethyl alcohol, and ethanol solution assisted with ultrasonic wave and supercritical CO2 on the structure, thermal stability and surface morphology of naturally green cotton were tested by Colorimeter, Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), thermogravimetric analysis (TGA), scanning electron microscope (SEM), optical microscope and HVI 900A cotton fiber detector. Results showed that ultrasonic wave contributed to pigment extraction and supercritical CO2 treatment promoted pigment to move outward causing deepening color. The data indicated that these treatments had no significant impacts on supramolecular structure, heat-resistant quality, and single fiber strength of green cotton.
