Functionalized nonwoven Nylon fabrics for cadmium ion exchange applications

Engineering and Applied Science Research

关键词: nonwoven;    functionalization;    heavy metals;    ion-exchange;    radiation;   

DOI  :  10.14456/easr.2020.25

来源: DOAJ

【 摘 要 】

Waterpollution isabig issueofour world. Thisresearchaimsto studythe possibility of using carboxylatefunctionalized synthetic nonwoven fabrics for removing heavy metals from contaminated water. Poly(acrylic acid) (PAA) and poly(itaconic acid)(PIA)weregraftedfromthesurfacesofindividual Nylon 6,6fibersofnonwovenfabricsbyradiationinduced-polymerization with Gamma-rays under various conditions. FTIR spectra show evidence of the carboxylate groups of PAA and PIA after polymer grafting. A comparison of fiber sizes and surface morphology of nonwoven Nylon fabrics before and afterPAAandPIAgraftingwasexamined using opticalmicroscopy(OM)andscanningelectronmicroscopy(SEM). The shrinkage, curl and non-uniformity of fibers observed by OM and SEM after polymer grafting might cause the changes in the waterpermeabilitiesof the modified Nylon fabrics. Afterhydrolyzation of modified Nylon fabricswith sodium hydroxide, staticcadmium(Cd2+)ionexchangecapacitiesweremeasuredforallfabricsamples. The Langmuirmodelwasusedto calculate parameters ,includingmaximumstaticCd2+ionexchangecapacitiesand the associationcoefficientstoexplain behaviors of unmodified and modified nonwoven Nylon fabrics. Using unmodified and PAA-and PIA-modified Nylon fabrics as ion-exchange membranes, these membranes provide higher water flowability than conventional membranes. Furthermore, thestaticCd2+ionexchangecapacitiesoftheseion-exchangemembranesare comparable tocommercialion-exchange materials.It wasalso found that duration timeof radiation inducing and heating steps along with various types of polymer grafting affected the ion exchange capacities and membrane performance.

【 授权许可】

Unknown