【摘要】 为了提高苹果的综合利用价值,本研究利用苹果渣作为原材料,应用微波-超声波协同效应辅以酸水解的方法制备纳米纤维素。在单因素试验的基础上,应用响应面试验法对工艺参数进行优化,并对制备得到的纳米纤维素进行了透射电镜(Transmission Electron Microscope,TEM)和粒径分析。结果表明:当微波功率为443.34 W、反应时间为13.89 min、硫酸浓度为53.93%、液料比为20.98:1时,预测得出纳米纤维素得率为29.66%,验证试验中纳米纤维素得率为29.52%。制备的苹果渣纳米纤维素呈棒状,直径为20～40 nm,长度为100～400 nm。更多还原

【Abstract】 In order to improve the comprehensive utilization value of apple pomace, in this study, nanocellulose was prepared by microwave-ultrasonic synergy assisted sulphuric acid hydrolysis method and with shells of apple pomace as raw material. The effects of four factors(e.g. microwave power, reaction time, H2 SO4 concentration, and liquid-to-solid ratio) on nanocellulose yield were investigated by single-factor tests. Based on the single-factor tests, the process parameters were optimized by a response surface method. Also the microstructure of the nanocellulose as-prepared was investigated by transmission electron microscopy(TEM), particle size distribution. Results show that The optimal process conditions were as follows: microwave power at 443.34 W, reaction time 13.89 min, H2 SO4 concentration 53.93%, and liquid-to-solid ratio 20.98 : 1. Under these conditions, the highest NCC yield was 29.66%, which was validated to be 29.52%. NCCs from shells of apple pomace were rodlike and partially aggregated. The diameter was measured to be 20～ 40 nm, and length was 100 ～ 400 nm.更多还原