沙柳纤维素提取工艺研究与结构表征
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摘要
探讨提取沙柳纤维素的工艺条件,并对沙柳纤维素的结构进行表征。分2个过程分别脱除沙柳中的半纤维素和木质素,通过单因素实验考察了碱液浓度、时间、温度等因素对纤维素含量的影响。实验结果表明,在NaOH溶液的质量分数为6%、半纤维素脱除温度为70℃、脱除时间为1. 5 h的条件下,半纤维素的脱除率为92. 44%;在NaClO溶液的浓度为40 g/L、木质素脱除温度为75℃时,木质素的脱除率为62. 70%。在上述条件下,沙柳纤维素含量为62. 90%。SEM、XRD、FT-IR、热重等分析表明,沙柳纤维素为I型晶型结构,热稳定较好。
The optimum technological conditions for extracting cellulose from Salix psammophila are discussed,and the structure of celluloseis represented. The hemicellulose and lignin in Salix Salix are removed in two processes.The single factor experiment show that the hemicellulose removal rate is 92. 44% when themass fraction of NaOH solution is 6%,hemicellulose removal temperature is 70 ℃ and hemicellulose removal time is 1. 5 h. The removal rate of lignin is 62. 70% when the concentration of NaClO solution is 40 g/L and the temperature of lignin removal is 75 ℃. Under the conditions,the cellulose content of Salix is 62. 90%. The results of SEM,XRD,FT-IR and thermogravimetric analysis show that Salix cellulose is type I crystal structure with good thermal stability.
The optimum technological conditions for extracting cellulose from Salix psammophila are discussed,and the structure of celluloseis represented. The hemicellulose and lignin in Salix Salix are removed in two processes.The single factor experiment show that the hemicellulose removal rate is 92. 44% when themass fraction of NaOH solution is 6%,hemicellulose removal temperature is 70 ℃ and hemicellulose removal time is 1. 5 h. The removal rate of lignin is 62. 70% when the concentration of NaClO solution is 40 g/L and the temperature of lignin removal is 75 ℃. Under the conditions,the cellulose content of Salix is 62. 90%. The results of SEM,XRD,FT-IR and thermogravimetric analysis show that Salix cellulose is type I crystal structure with good thermal stability.
引文
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[2]Imane K,Hamid S.Extraction and characterization of cellulose and cellulose nanofibers from Citrullus colocynthis seeds[J].Industrial Crops&Products,2018,124.
[3]刘悦欣,李帅.响应面法优化苹果渣中微晶纤维素的提取[J].饲料与畜牧,2018(11):56-60.
[4]李婉.植物细胞壁中纤维素结构及纤维素的提取和功能材料制备[D].合肥:中国科学技术大学,2018.
[5]陈雪峰,李列琴,熊正宇,等.苹果渣纤维素提取工艺的优化[J].陕西科技大学学报,2018,36(2):45-49.
[6]齐长雪,张丹蓉,赵磊,等.毛乌素沙地沙柳蒸腾特征研究[J].陕西农业科学,2018(10):1-5.
[7]盛卫,董伊航,周宁,等.沙柳皮基微晶纤维素的制备及其性能表征[J].纺织学报,2016,37(6):7-12.
[8]李亚斌,王海,黄金田.沙柳材中纤维素和半纤维的分离及性能表征[J].内蒙古农业大学学报(自然科学版),2014,35(1):139-143.
[9]黄明星,周彩荣.沙柳酸催化乙醇法提取纤维素预处理工艺的优化[J].江苏农业科学,2014,42(3):224-226.
[10]温俊峰,刘侠,高立国,等.沙柳生物吸附剂对含酚废水的吸附性能研究[J].化工新型材料,2018,46(8):276-280.
[11]王红红,王欣.沙柳平茬机研究现状及发展方向[J].林业机械与木工设备,2017(3):13-15.
[12]宋江湖,韩宇平,封斌.榆林市沙柳资源现状及产业发展研究[J].陕西林业科技,2011(3):26-28.
[13]冯利群,高晓霞,王喜明.沙柳木材显微构造及其化学成份分析[J].内蒙古林学院学报,1996(1):38-42.
[14]李春光,董令叶,吉洋洋,等.花生壳纤维素提取及半纤维素与木质素脱除工艺探讨[J].中国农学通报,2010,26(22):350-354.
[15]王立华,王永利.秸秆纤维素提取方法比较研究[J].中国农学通报,2013,29(20):130-134.
[16]温俊峰,刘侠,李霄.沙蒿微晶纤维素制备工艺及性质研究[J].食品与机械,2018,34(8):139-144.
[17]Puri V P.Effect of crystallinity and degree of polymerization of cellulose on enzymatic saccharification[J].Biotechnology and Bioengineering,1984,26(10):1219-1222.