有机酸水解制备甘蔗渣纤维素纳米晶体及其性能研究OA

This study utilized sugarcane bagasse as raw material,employed a pretreatment method combining p-toluenesulfonic acid-alkali-bleach to obtain sugarcane bagasse cellulose(TSA-SCB).Subsequently,oxalic acid hydrolysis was applied to produce sugarcane bagasse cel-lulose nanocrystal(SCB-CNC).The optimum preparation conditions of both TSA-SCB and SCB-CNC were investigated.The results showed that lignin and hemicellulose from SCB were efficiently removed,and the prepared TSA-SCB had a high purity,when thep-toluenesulfonic acid solution concentration was 65％,reaction temperature was 80℃,and reaction time was 20 min.Under the conditions of oxalic acid solu-tion concentration of 90％,hydrolysis temperature of 110℃,and hydrolysis time of 3 h,SCB-CNC had a yield of 29.8％with the Zeta poten-tial of-32.65 mV and excellent stability of suspension.The physicochemical properties of SCB-CNC were characterized,the results indicat-ed that SCB-CNC exhibited rod-shaped with an average length and average width of about 468 and 39 nm,respectively,and it was successful-ly introduced carboxyl groups onto surface of SCB-CNC while retaining the crystalline structure of cellulose type I.Furthermore,SCB-CNC suspensions could self-assemble into a chiral nematic liquid crystal phase at a certain concentration.