کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
635123 | 1456091 | 2012 | 8 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Enhancing the permselectivity of pervaporation membrane by constructing the active layer through alternative self-assembly and spin-coating Enhancing the permselectivity of pervaporation membrane by constructing the active layer through alternative self-assembly and spin-coating](/preview/png/635123.png)
Polyelectrolyte composite membranes with ultrathin active layer were utilized for pervaporation dehydration of ethanol aqueous solution. The active layer was constructed by sequential spin-coating and self-assembly of chitosan (CS) and hyaluronic acid (HA), respectively, on the polyacrylonitrile (PAN) support layer. The spin-coating layer was denoted as inner layer, and the self-assembly layer was denoted as capping layer, and these two layers were compatible well without distinct boundary. Compared with single-active-layer CS/PAN and HA/PAN membranes, the HA/CS/PAN membranes showed higher separation factor. It was also observed that the separation factor of the HA/CS/PAN membranes with HA as capping layer was higher than that of the CS/HA/PAN membrane with CS as capping layer, but their fluxes were quite close. A probable explanation was presented based on the higher sorption selectivity of HA and the higher diffusion selectivity of CS. Under the optimized membrane preparation recipe, the HA/CS/PAN membrane exhibited the permeation flux of 1447 g/(m2 h) and the separation factor of 704 for dehydration of 90 wt.% ethanol aqueous solution at 80 °C. Furthermore, the membranes displayed the desirable long-term operation stability.
► Composite membranes were prepared by sequential spin-coating and self-assembly.
► Positioning of HA layer and CS layer in membrane affected the separation factor.
► HA/CS/PAN membrane showed both high permeability and selectivity.
Journal: Journal of Membrane Science - Volumes 390–391, 15 February 2012, Pages 218–225