微波协同离子液体EmimOAc处理毛竹的研究

Study on Microwave-assisted Ionic Liquid Treatment on Bamboo

在微波作用下用离子液体1-乙基-3-甲基咪唑乙酸盐(Emim OAc)溶解经球磨并脱脂脱蜡后的毛竹竹粉,通过激光扫描共聚焦显微镜观察了竹粉在离子液体中的溶解过程。微波辐射60 min后可以实现竹粉在离子液体中的完全溶解。在离子液体/竹粉溶液中加入反溶剂可得到结构均匀的富含纤维素物质,最大得率为62.7%。Klason木素含量与FT-IR、XRD和SEM的分析结果表明,Emim OAc能够有效去除竹粉中的木素,最高去除率为57.1%;经离子液体处理后竹粉中的糖类物质含量增加;纤维素结晶度明显降低,晶型从Ⅰ型转变为Ⅱ型。

Ball milled and dewaxed bamboo （Phyllostachy pubescens Mazel） powder was dissolved in 1-ethyl-3-methylimidazolium acetate （EmimOAc） assisted by microwave irradiation,the dissolution process was observed using laser confocal scanning microscopy.When irradiating by microwave for 60 min,bamboo powder was completely dissolved in ionic liquid.The cellulose-rich material with homogenous structure could be obtained by adding anti-solvent into biomass-ionic liquid solution,the maximum yield was 62.7％.Analysis results of acid insoluble lignin content,FT-IR,XRD and SEM showed that ionic liquid could remove lignin effectively,the highest removal rate was 57.1％,after ionic liquid pretreatment,the carbohydrate content of bamboo powder increased ; the cellulose crystallinity became lower and cellulose Ⅰ converted to be cellulose Ⅱ.