Separation of Co(II) from sample water by schiff base- chitosan grafted multiwalled carbon nanotubes
نویسنده
چکیده
A novel Schiff base-chitosan-grafted multiwalled carbon nanotubes (S-CS-MWCNTs) solid-phase extraction adsorbent was synthesized by covalently grafting a Schiff base-chitosan (S-CS) onto the surfaces of oxidized MWCNTs. The stability of a chemically(S-CS-MWCNTs) especially in concentrated hydrochloric acid which was then used as a recycling and pre-concentration reagent for further uses of (S-CS-MWCNTs). The application of this (S-CS-MWCNTs) 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. Co(II) was found to exhibit the highest affinity towards extraction by these (S-CS-MWCNTs) phases. The pronounced selectivity was also confirmed from the determined distribution coefficient (Kd) of all the metal ions, showing the highest value reported for Co(II) to occur by (S-CS-MWCNTs). The potential applications of (S-CS-MWCNTs) for selective extraction of Co(II) to occur from aqueous solution were successfully accomplished as well as preconcentration of low concentration of Co(II) (60 pg ml -1 ) from natural tap water with a preconcentration factor of 100 for Co(II) off-line analysis by flame atomic absorption analysis.
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