In this study cellulose-rich membranes were fabricated from untreated and treated hardwood biomass solutions in 1-ethyl-3-methylimidazolium acetate ([Emim][OAc])—dimetylsulfoxide (DMSO) system via wet phase separation. Wood treatment methods aimed to get purified cellulose fraction of wood. Treatment sequence was as followed: deep eutectic solvent pretreatment, sodium chlorite bleaching, and alkaline treatment. Resulted biomass after each treatment step was characterized by chemical composition and crystalline fraction content. Flat-sheet membranes were produced from biomass samples after each treatment step. Characterization of membranes included measurements of pure water permeability and (poly)ethyleneglycol 35 kDa retention, Fourier-transform infrared and Raman spectroscopy, X-ray diffraction measurements and thermogravimetric analysis. The study revealed that it was possible to fabricate membrane from untreated wood as well as from wood biomass after each of treatment steps. The resulted membranes differed in chemical composition and filtration performance. Membrane prepared directly from untreated wood had the highest permeability, the lowest retention; and the most complex chemical composition among others. As treatment steps removed lignin and hemicelluloses from the wood biomass, the corresponding membranes became chemically more homogeneous and showed increased retention and decreased permeability values.

在这项研究中，富含纤维素的膜是通过湿相分离法，在未经处理和经过处理的硬木生物质溶液中，在乙酸1-乙基-3-甲基咪唑鎓盐（[Emim] [OAc]）-二甲亚砜（DMSO）系统中制成的。木材处理方法旨在获得木材的纯化纤维素级分。处理顺序如下：深共熔溶剂预处理，亚氯酸钠漂白和碱处理。每个处理步骤后得到的生物质均以化学成分和结晶级分含量为特征。在每个处理步骤之后，由生物质样品制备平板膜。膜的表征包括纯水渗透性和35 kDa（聚）乙二醇保留值的测量，傅立叶变换红外和拉曼光谱，X射线衍射测量和热重分析。研究表明，在每个处理步骤之后，都可以由未处理的木材以及木材生物质制造膜。所得膜的化学组成和过滤性能不同。直接由未经处理的木材制得的膜的渗透率最高，保留率最低；以及最复杂的化学成分。随着处理步骤从木材生物质中去除木质素和半纤维素，相应的膜在化学上变得更加均匀，并显示出增加的保留力和降低的渗透率值。直接由未经处理的木材制得的膜的渗透率最高，保留率最低；以及最复杂的化学成分。随着处理步骤从木材生物质中去除木质素和半纤维素，相应的膜在化学上变得更加均匀，并显示出增加的保留率和降低的渗透率值。直接由未经处理的木材制得的膜的渗透率最高，保留率最低；以及最复杂的化学成分。随着处理步骤从木材生物质中去除木质素和半纤维素，相应的膜在化学上变得更加均匀，并显示出增加的保留率和降低的渗透率值。