Modification Of Polyethylene Terephthalate Membranes And The Application

Electrospun nanofibrous membrane is an excellent alternative material for heavy metal adsorption. In this paper, low temperature plasma technique was used to initiate the copolymerization between monomers containing the hydrophilic groups and the surfaces of electrospun nanofibrous membranes, and then explored the influence of different monomers used to modify the membranes on the heavy metal adsorption capacity. Moreover, different factors were studied to find the effect on the heavy metal adsorption capacity of the modified nanofibrous membranes. The main work of this paper is as follows:1. Polyethylene terephthalate (PET) nanofibrous membrane were prepared by electrospinnig, gas and aqueous graft polymerization of acrylic acid (AA) were conducted on the surface of the electrospun nanofibrous membranes through low temperature plasma technique, and the completely hydrophilic membranes modified with AA were successfully obtained, then the modified membranes were used to the removal of Cu (Ⅱ). The influence of different parameters in the heavy metal adsorption process on the adsorption capacity was discussed, and the results showed that the Cu (Ⅱ) adsorption capacity grew with adsorption time and reached adsorption equilibrium at last, the amount of the equilibrium adsorption capacity of the modified membranes was closely influenced by the concentration and pH value of the initial Cu (Ⅱ) aqueous solution. Comparing the two kinds of membranes, the membrane modified with AA through aqueous graft polymerization had a better adsorption efficiency for Cu (Ⅱ) for more AA grafted on the membrane surface.2. Electrospinning technology and low temperature plasma technique were combined to induce the graft polymerization of acrylamide (AM) on the surface of polyethylene terephthalate (PET) nanofibrous membrane, membranes containing-NH2functional group were successfully prepared, then the modified membranes were used to the removal of Cu (Ⅱ). The influence of different parameters in the heavy metal adsorption process on the adsorption capacity was discussed, and the results showed that the surfaces of the modified membranes were completely hydrophilic and Cu (Ⅱ) adsorption capacity grew with adsorption time and reached adsorption equilibrium finally, the concentration and pH value of the initial Cu (Ⅱ) aqueous solution had a critical effect on the process of adsorption of the modified membranes and then impacted the amount of the equilibrium adsorption capacity. Comparing to the above two kinds of membranes, the membrane modified with AM had the best adsorption efficiency for Cu (Ⅱ) for the selective adsorption of Cu(Ⅱ)3. Polyethylene terephthalate (PET) nanofibrous membrane were prepared by electrospinnig, aqueous graft polymerization of sodium-p-styrenesulfonate (SSS) containing-SO3H functional group were conducted on the surface of the electrospun nanofibrous membranes through low temperature plasma technique, and the completely hydrophilic membranes modified with AM were successfully obtained, then the modified membranes were used to the removal of Cu (Ⅱ). The plasma processing time exerted an influence on the efficiency of SSS graft polymerization, aqueous graft polymerization time influenced the fiber morphology and then the equilibrium adsorption capacity. What’s more, the ratio of AA/SSS had a decisive impaction on the adsorption capacity.