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Reference type: Journal
Authors: Ide T, Suzuki A, Imada T
Article Title: Lanthanide selective adsorption by ion-imprinted polymer with chelidonic acid monoamide groups.
Publication date: 2016
Journal: Separation Science and Technology
Volume: 51
Issue: (18)
Page numbers: 2887-2895.
DOI: 10.1080/01496395.2016.1230630

Abstract: Lanthanide selective adsorbent with chelidonic acid monoamide group was synthesized based on the ion-imprint method and its adsorption character was investigated. A polymerizable ligand 3 with chelidonic acid group was obtained by condensation of chelidonic acid and 4-aminostyrene. A Nd-complex monomer 7 was synthesized from the obtained ligand 3 and Nd(NO3)3. Copolymerization of the Nd-complex monomer, styrene and divinylbenzene afforded Nd-containing polymer 8. To obtain Nd-imprinted polymer 9, Nd ion was removed by hydrochloric acid. A non-imprinted polymer 6 composed by 3, styrene and divinylbenzene was also synthesized. Elemental analysis revealed that the content of chelidonic acid monoamide ligand in the 6 and 9 is 1.70 and 1.56 mmol g-1, respectively. BET method indicated that 6 and 9 has specific surface area of 14.7 and 1.51 m2 g-1, respectively. Nd adsorption experiments revealed 9 exhibits imprinting factor (IF) 4.3 at initial concentration 0.4 mmol-Nd/L, despite 9 has 0.92-fold of ligands and 0.1-fold of specific surface area of 6. Mixed ion solution including Nd, Dy, Cu, Zn, and Co was used as a model solution for an adsorption experiment. 9 exhibits high lanthanide selectivity in a range of pH of 3.0-7.0 and a maximum adsorption amount at pH 3.75, despite 6 shows the maximum at pH 5.0. Density functional theory (DFT) calculation of a model system revealed that the ion-imprint effect and inhibition effect is cause of large adsorption amount of 9
Template and target information: neodymium ion, Nd(III)
Author keywords: Density functional theory calculation, lanthanides, ion-imprint method, Solid-phase extraction

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