Abstract
In this paper, we report the synthesis of three new adsorbent materials for the recovery of Pb(II) ions in aqueous media by immobilization of the 3′,4′,5,7-pentahydroxyflavone (quercetin) on the Merrifield resin. The Merrifield’s resin was modified with different length alkyl chain spacers arms (oxi-alkyl-OH with six, seven and ten methylene groups) to immobilize quercetin on the resin. Materials characterization was performed by IR spectroscopy, molecular fluorescence and elemental microanalysis. The conversion rates showed yields higher than 95%. The adsorption properties of the Pb(II) ions showed that the highest retention is observed into the range of 0.64 to 1.21 mg g−1 in a dynamic regime at pH 5. The optimal concentration of the HNO3 eluent was 1 mol l−1 with 10 ml as the elution volume, and the pre-concentration factor was 4. Finally, a 93% of Pb(II) recovered was obtained on water supply employing the MR6Q resin, which also present stable behaviour and reusability in sorption and desorption cycles. These results encourage the use of these materials for pre-concentration and determination of Pb (II) in water.
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