Abstract
Abstract In this study, an environmentally friendly strategy for the extraction of cellulose nanocrystal (CNC) by ball mill assisted fully recyclable solid acid hydrolysis of cellulose fiber was developed. Thanks to the low water solubility, the acid could be easily and conveniently recovered after hydrolysis reaction. The solid acid can be fully recovered by simply recrystallization at lower temperature and reused as acid source to extract cellulose nanocrystal without losing their acidity. The effect of extraction parameters, such as ball mill time, concentration of solid acid, reaction temperature and time on the morphology and yield of CNC were comprehensively studied. A relatively high yield of 59% and maximum degradation temperature of 332 °C was achieved by this novel solid acid hydrolysis method. The ability to reuse the solid acid by a simple and conventionally proven recrystallization method make this method extremely suitable for green and sustainable produce of cellulose nanocrystal.
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