玉米芯纤维素的绿色高效提取及其特性研究

Study on green and efficient extraction of corncob cellulose and its characteristics

玉米芯是一种农林废弃物,实现其高值化利用的途径之一是组分分离.利用低浓对甲苯磺酸(p-TsOH)预处理脱除玉米芯半纤维素,然后利用高浓p-TsOH处理提取玉米芯纤维素,考察了p-TsOH浓度、反应温度和反应时间对玉米芯纤维素纯度和得率的影响,并且采用SEM、FT-IR、XRD对玉米芯纤维素进行了表征分析.研究表明,经过低浓p-TsOH预处理,半纤维素的脱除率达92.44%;玉米芯纤维素的最佳提取工艺为p-TsOH浓度为80 wt%、反应温度为80℃、反应时间为60 min,此时玉米芯纤维素的得率为34.07%、纤维素纯度为88.47%,并且呈现多孔的棒状结构,结晶度为60.99%.

Corncob is an agricultural residue,one of the ways to achieve its high-value utilization is component separation.Low-concentration p-toluenesulfonic acid(p-TsOH)was used to remove corncob hemicellulose,then high-concentration p-TsOH was used to extract corncob cellulose.The effects of p-TsOH concentration,reaction temperature and reaction time on the purity and yield of corncob cellulose were investigated,and SEM,FT-IR and XRD were used to characterize corncob cellulose.The results showed that after low-concentration p-TsOH pretreatment,the removal rate of hemicellulose reached 92.44%;the optimal extraction process of corncob cellulose was that the concentration of p-TsOH was 80 wt%,the reaction temperature was 80℃,and the reaction time was 60 min.And under this condition,the yield of corncob cellulose was 34.07%,and its purity was 88.47%.The corncob cellulose exhibited a rod-like porous structure,and its crystallinity was 60.99%.