Synthesis of 4-acylpyrazolone Schiff base ligand grafted silica and selectivity in adsorption of lanthanides from aqueous solutions
来源期刊：JOURNAL OF RARE EARTHS2009年第5期
论文作者：Sukesh K. Aghara Onome S. Owereh Ananda S. Amarasekara
Key words：4-acylpyrazolone; Schiff-base; grafted-silica; lanthanides; adsorption; rare earths;
Abstract: The Schiff base form of the 4-acylpyrazoione ligand was immobilized on the silica surface by reaction of 3-aminopropyl silica with 4-acetyl-5-methyl-2-phenyl-2,4-dihydro-pyrazol-3-one in 97% yield, producing grafted silica with 0.77 mmol/g ligand loading. This surface modified silica was shown to be selective in the adsorption of Yb3+ ions from dilute aqueous solutions, for which 98% adsorption was observed from a 1.0×10~(-5) mol/L aq. solution at pH 6.7, after 24 h at room temperature. Six other lanthanides studied Eu~(3+), Gd~(3+), Nd~(3+), Tb~(3+),Sm~(3+) and La~(3+) showed moderate to weaker adsorptions of 39%, 28%, 16%, 12%, 11% and 5% respectively under similar conditions.
Sukesh K. Aghara1，Onome S. Owereh2，Ananda S. Amarasekara2
(1.Department of Chemical Engineering, Prairie View A&M University, Prairie View, Texas 77446, USA;
2.Department of Chemistry, Prairie View A&M University, Prairie View, Texas 77446, USA)
Abstract:The Schiff base form of the 4-acylpyrazoione ligand was immobilized on the silica surface by reaction of 3-aminopropyl silica with 4-acetyl-5-methyl-2-phenyl-2,4-dihydro-pyrazol-3-one in 97% yield, producing grafted silica with 0.77 mmol/g ligand loading. This surface modified silica was shown to be selective in the adsorption of Yb3+ ions from dilute aqueous solutions, for which 98% adsorption was observed from a 1.0×10~(-5) mol/L aq. solution at pH 6.7, after 24 h at room temperature. Six other lanthanides studied Eu~(3+), Gd~(3+), Nd~(3+), Tb~(3+),Sm~(3+) and La~(3+) showed moderate to weaker adsorptions of 39%, 28%, 16%, 12%, 11% and 5% respectively under similar conditions.
Key words:4-acylpyrazolone; Schiff-base; grafted-silica; lanthanides; adsorption; rare earths;
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