مطالعه رفتار تراوائی الیاف توخالی تهیه شده از پلی آکریلونیتریل اصلاح شده با نانو خاک رس

asymmetric membranes are widely used in many industrial membrane separation processes. the major advantage of membrane filtration over the conventional process is its ability to remove a wider spectrum of particles without using any chemicals. hollow fiber configuration offer many advantages over flat-sheet or tubular membranes. the spinning process of hollow fiber may look simple, yet it is tedious to find the appropriate conditions to obtain the desirable morphology, separation and permeation performance. in this project, asymmetric polyacrylonitrile/nanoclay hollow fiber membranes were fabricated through the dry-jet wet spinning process to improve the membrane properties. water with different amount of glycerin was used as the bore liquid and coagulation bath. the effects of the glycerin concentration in coagulation and percent of nanoclay in the spinning dope on the hollow fiber structure, permeation and separation performance were investigated. field emission scanning electron microscopy (fe-sem) was used to analyze the cross-section and outer surface of the hollow fiber membranes. furthermore porosity and the mechanical properties were measured. direct dyes with different molecular weight was used to measure the permeation properties of the hollow fibers. x-ray diffraction was used to analyze structure of hollow fibers. thermogravimetric analysis (tga) was used to determine the weight of the inorganic residue. fourier-transform infrared (ftir) spectra of the pan and nanoclay was used to study interaction between nanoclay and polyacrylonitrile. the results proved that permeation is increased by adding glycerin to external and internal coagulation bath. in addition, hollow fibers spun in lower glycerin showed lower hydraulic permeability and higher separation capability. on the base of the analysis of, both the porosity and hydraulic permeability by adding nanoclay to the hollow fiber membranes, permeation is increased and separation capability is decreased.