The synthesis of metal ion adsorbents from modified banana fibers comprising a Schiff base was investigated. The adsorption properties of a metal ion adsorbent were evaluated, and banana fiber (BF)-g-(glycidyl methacrylate)(GMA)(BF-GMA) were synthesized. A Schiff base 2,2'-{iminobis[ethane-2,1-diylnitrilo(E)methylidine]}bisphenol was synthesized via a reaction of diethylenetriamine and 5-bromo-salicyialdehyde in methanol. A metal ion adsorbent (BF-GMA(Br)) was synthesized via a reaction of the Schiff base with BF-GMA. , and Er 3+ were adsorbed in a pH range of 6.0-6.6 by the synthesized metal ion adsorbent. Almost 100% of In 3+ at a pH value of 3.0-4.0 and 95% of Ga 3+ at a pH value of 3.9 were absorbed, thereby showing the maximum adsorption percentage. Almost 15% and 25% of In 3+ was adsorbed at a pH value of 1.4-1.6 and 1.8, respectively. Adsorption of Ga 3+ was barely observed in the pH range of 1.4-1.8. These results show that banana fibers can be utilized as metal ion adsorbents.

Solid-phase extraction (SPE) of divalent metal ions with a lipophilic and potentially divalent hexadentate chelating reagent (H2L), with which octadecylsilyl silica (ODS) was impregnated, was studied to gain more insight into and develop the potential of this methodology. This is the first time to demonstrate that this reagent as well as other common nitrogencontaining reagents were retained both by adsorption due to hydrogen bonding between nitrogen atoms of the reagent and residual silanol groups in the ODS phase and by simple distribution into the hydrophobic space. An appreciably large amount of this reagent could be retained by the adsorption mechanism even with a relatively thin loading solution. ) with anion in SPE with H2L. The extractability and selectivity were substantially the same as that in liquid-liquid extraction.

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