摘要
竹材纳米纤维素纤丝(NFC)自然界来源丰富,具有纳米材料和生物质材料的双重特性,在可降解包装材料、生物功能材料等领域具有广阔应用前景。在竹材NFC制备过程中,由于竹材纤维中的“天然抗降解屏障”以及纤维素超分子中有序的结晶结构区,导致微纳化过程中酶解率低、处理时间长等缺陷,限制了竹材NFC的大规模产业化制备。本研究在生物酶-机械法的制备基础上,采用臭氧预处理工艺,破除竹材纤维中木质素结构,提高纤维素酶的可及性和NFC得率。结果表明:竹材物料尺寸以及含水量对竹材木质素去除具有重要影响。综合臭氧消耗浓度和处理时间,优选预处理条件为:竹材粒径为80/150目,含水量为60%。臭氧预处理后竹材NFC得率从74.2%增到84.6%。臭氧预处理是一种绿色环保、对后续酶解影响小的预处理工艺,能有效降解竹材中的木质素和少量半纤维素,且对纤维素影响小,在竹材NFC清洁化、低能耗制备领域具有广阔应用前景。
Bamboo nanofibrillated cellulose(NFC)is widely existed in natural sources.Moreover,it has the dual characteristics of nano materials and biomass materials.It presents broad application prospects in the fields of degradable packaging materials and biological functional materials.However,the“natural anti degradation barrier”in bamboo fibers and the ordered crystalline structure region in cellulose supramolecules,leads to the defects of low enzymatic hydrolysis efficiency and long treatment time in the process,which limits the large-scale industrial preparation of bamboo NFC.In this study,NFC was preparated by biological enzyme and mechanical grinding,ozone pretreatment could be used to break the lignin structure in bamboo fiber and improve the accessibility of cellulase.The results showed that the size and water content of bamboo material had an important effect on the removal of bamboo lignin.Based on the ozone consumption rate and reaction time,the optimal pretreatment conditions was as follows:the particle size of bamboo 80/150 mesh and the water content 60%,respectively.After ozone pretreatment,the yield of bamboo NFC was increased from 74.2%to 84.6%.Ozone pretreatment is a green and environmentally friendly pretreatment process.It has little impact on subsequent enzymatic hydrolysis.Ozone pretreatment can effectively degrade lignin and a small amount of hemicellulose in bamboo and have little impact on cellulose.It owns a broad application prospect in the green preparation of bamboo NFC with low energy consumption.
作者
吕勇
包云飞
宋词
叶登
LV Yong;BAO Yun-fei;SONG Ci;YE Deng(School of Mechanical Engineering and Information,Yiwu Industrial&Commercial College,Yiwu 322000,China;School of Light Indurstry and Engineering,South China University of Technology,Guangzhou 510641,China;Zhejiang Lanyu Digital Technology Co.,Ltd,Yiwu 322002,China)
出处
《印刷与数字媒体技术研究》
CAS
北大核心
2023年第2期123-129,共7页
Printing and Digital Media Technology Study
基金
浙江省教育厅科研资助项目--基于臭氧预处理的竹材纳米纤维素纤丝制备关键技术研究(No.2021JYTYB01)。
关键词
纳米纤维素纤丝
竹材
臭氧
预处理
Nanofibrillated cellulose
Bamboo
Ozone
Pretreatment
