Modified poly (ethylene terephthalate)-grafted-acrylic acid/acryl amide fiber was prepared by adding acrylic fibers to methanolamine (PET-AA/AAm) with different concentration solutions. The stability of a chemically modified PET-AA/AAm fiber especially in concentrated hydrochloric acid which was then used as a recycling and Preconcentration reagent for further uses of modified PET-AA/AAm fiber. The application of this modified PET-AA/AAm fiber for sorption of a series of metal ions was performed by using different controlling factors such as the pH of metal ion solution and the equilibration shaking time by the static technique. Ni(II) was found to exhibit the highest affinity towards extraction by these modified PET-AA/AAm fiber phases. The pronounced selectivity was also confirmed from the determined distribution coefficient (Kd) of all the metal ions, showing the highest value reported for Ni(II) to occur by modified PET-AA/AAm fiber. The potential applications of modified PET-AA/AAm fiber for selective extraction of Ni(II) to occur from aqueous solution were successfully accomplished as well as Preconcentration of low concentration of Ni(II) (60 pg ml-1) from natural tap water with a Preconcentration factor of 100 for Ni(II) off-line analysis by flame atomic absorption analysis.
Key words: Preconcentration, Ni(II), modified poly (ethylene terephthalate)-grafted-acrylic acid/acryl amide fiber (PET-AA/AAm).
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