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Functionalizion Of Alumina With Methionine As Solid Phase For Selective Ion Exchange And Preconcentration Of Heavy Metals

Mohamed E.Mahmoud, Maher M.Osman, Osama F.Hafez, Amr A.Yakout, Ahmed Alrefaay

Methionine as an example of amino acids and environment friendly compound was used to modify the surface of alumina via physical adsorption approach in a clean and green chemical procedure. Three newly synthesized alumina phases, acidic(I), neutral (II) and basic(III) were prepared and charecterization of surface modification was accomplished by study the mass spectrometric analysis and infrared as well as determination of surface coverage by thermal desorption and metal probe testing methods. The metal sorption properties of modified alumina-physically adsorbedmethionine phases(I-III) were also studied and evaluated for a series of metal ions under various buffer solutions and shaking times as controlling factors. Methionine-modified-alumina as new solid phase extractors were experienced with good incorporated selectivity characters toward Pb(II), Cr(III) and Fe(III) based on determination and evaluation of the distribution and separation factor values. The utilization and application of modified alumina phases(I-III) for selective extraction and preconcentration of ppm and ppb concentration levels of these metal ions from real drinking and waste water samples were successfully accomplished with excellent recovery values and without interference of the matrix.