Preparation and Characterization of Oat Hull Cellulose Nanocellulose
In order to improve the utilization value of oat hull,the oat hulls were used as the raw materials,and the nano-cellulose crystals (OH-CNC )of oat hulls were prepared by sulfuric acid hydrolysis with different acid hydrolysis time (30 min,60 min and 90 min ),and their morphological characteristics,yield,chemical/crystal structure,thermal stability,potential and adsorption characteristics were analyzed.The results indicated that the pre-pared OH-CNC had a rod-like structure.With the increase in acid hydrolysis time (30-90 min),the average length of OH-CNC decreased from 476.61 nm to 269.91 nm and the average diameter decreased from 52.43 nm to 37.58 nm.The yield of OH-CNC increased and then decreased with the acid hydrolysis time,with the highest yield (28.11％)at 60 min of acid hydrolysis.The chemical structure of the OH-CNC still had the basic chemical struc-ture of cellulose,and the crystal structure of OH-CNC was a typical cellulose type I crystal.The crystallinity of OH-CNC was 66.25％ at 60 min of acid hydrolysis,and the thermal stability of OH-CNC showed a decreasing trend with the increase in acid hydrolysis time.The zeta potential values of the OH-CNC suspensions were all less than-30 mV,all have obvious Tyndall phenomenon,showing good dispersion stability in water,and their water/oil holding properties were better than those of wheat straw nanocellulose crystals.
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