ИСТИНА

Cellulose is a promising material for development of the membranes employed in organic solvent nanofiltration (OSN), as cellulose is chemically resistant in the majority of organic media. However, the unique chemical stability of the material complicates its solubility as well as fabrication of cellulose-based membranes. Recently much attention was paid to cellulose dissolution in ionic liquids (ILs). In addition, to reduce the cost of the dissolution process and the viscosity of the molding solution, a cosolvent often added to the ILs. Hence, the aim of the research is to develop composite cellulose membranes from the mixture of ILs with DMSO for OSN. Cellulose was dissolved in pure ILs ([EMIM][Cl], [BMIM][Ac], and [EMIM][Ac]) and its mixture with DMSO. Based on the obtained data, the technique was developed for preparation of cellulose solutions used in fabrication of defect-free composite membranes. Furthermore, the effect of polyester support treatment was investigated in order to enhance the adhesive properties between cellulose layer and nonwoven material. The nanofiltration properties of composite cellulose membranes were studied from the point of view of DMF permeability and retention of model solutions. To enhance transport and barrier properties of the composite cellulose membranes, the effect of different coagulation baths was studied.