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50PEO20 – 3 wt% 20 wt% 2.2 Solution testing equipment A rotating viscometer (Brookfield, DV-II) was used for viscosity measurements of prepared solutions. Results were taken at the same shearing rates. The electric conductivity was tested with a conductivity meter (Mettler Toledo), at 22°C temperature and 35% relative humidity. The mean value of five measurements is presented as a result. 2.3 Electrospinning The photograph of conventional electrospinning setup used for production of nanofiber mats is shown in Figure 2 . The polymer solution was contained in a

-soluble polyhydroxy polymer and has excellent chemical resistance and physical properties along with complete biodegradability, which leads to broad practical applications. In the case of colored textile wastewater, these membranes can be used for both filtration and dye adsorption purposes, which allows the removal of submicron particles and as well as the removal of color from wastewater. PVA nanofiber mats could be prepared by the electrospinning of the aqueous PVA solutions and could be cross-linked with chemical crosslinking agents [ 31 ]. In this study, to make PVA nanofibers

, the surface charge density of the spinning jet increases, and finally, the fiber diameter decreases due to the increase in the splitting frequency of the jet. Figure 10 SEM images of PEO nanofiber mats fabricated by the CSBS system at the DC: (a) 5 cm, (b) 10 cm, (c) 15 cm, (d) 20 cm, and (e) 25 cm Figure 11 Relationship between DC and the fiber diameter 4.3 Effect of voltage on the nanofiber diameters Scanning electron microscopy images of CSBS fiber formations obtained at voltages of 4, 6, 8, 10, and 12 kV are shown in Figure 12 (a)–(e) , respectively. The