Features of the interaction of Cu(II) ions with poly-4-vinyl pyridine in an acid medium

Polinskii, A.S.; Pshezhetskii, V.S.; Kabanov, V.A.

doi:10.1016/0032-3950(85)90451-4

Cited by 3 publications

(1 citation statement)

References 5 publications

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“…The model described above is one of the two principal different models applied in the study of polymeric features of the complexing process. Its limitation explains the use of the other important model in numerous works reported in the literature [37,38]. In this other model, the macromolecule is considered as a matrix with a certain number of perfectly defined binding sites.…”

Section: Ii22 the Macrocomplex Formationmentioning

confidence: 99%

Removal of Metal Ions from Aqueous Solutions by Complexation –Ultrafiltration Hybrid Process: A Bibliographical Overview

Mimoune¹,

Belazzougui²,

Benaboura³

2014

J. Memb. Separ. Tech.

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Water pollution by metal ions contaminants is a worldwide alarming problem. Clean and safe water is becoming in the same time an increasing scare resource. Thus, to keep this fundamental resource available and suitable for use, water treatment methods are investigated by means of numerous research studies since the purification of water and its re-use and, in a larger scale, the environmental protection will be essential henceforth in any strategy of development. Membrane processes, in general, and ultrafiltration, in particular, develop, without stopping, since the beginning of the sixties to meet the vital need for environmental safety which justifies the policies of durable development adopted today all over the world. Thanks to its growing, ultrafiltration becomes an irreplaceable weapon in the control of pollution. It is classified as a soft and clean technology since it needs low energy consumption and ensures a notable reduction in pollution production during the treatment step. Ultrafiltration is a pressure driven membrane process with the ability to separate molecules in solution on the basis of size. A microporous ultfafiltration membrane retains species with molecular weight higher than its cut off, while small molecules as solvents and microsolutes can pass freely through it. Thus, metal ions aren't rejected by ultrafiters. However, ultrafiltration can be used to remove metal ions from aqueous solutions by coupling the process with complexation. Indeed, the complexation of metal ions using water soluble polymers as substrates is able to expand artificially the size of the metallic species so as to make possible their rejection by the microporous ultrafilters. The complexation-ultrafiltration hybrid process was first suggested at the end of the sixties by A. S. Michaels. Since then, many studies have shown its effectiveness in the treatment of aqueous solutions containing metal ions. This paper gives an overview of academic studies that illustrate and demonstrate the efficiency and the promising of the hybrid process in the purification of water from metal ions contaminants beforehand sequestered by adequate watersoluble macromolecular substrates.

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Section: Ii22 the Macrocomplex Formationmentioning

confidence: 99%

Removal of Metal Ions from Aqueous Solutions by Complexation –Ultrafiltration Hybrid Process: A Bibliographical Overview

Mimoune¹,

Belazzougui²,

Benaboura³

2014

J. Memb. Separ. Tech.

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Dual sorption of metal-ions on a crosslinked resin of 2-acrylamidoglycolic acid and 4-vinylpyridine

et al. 1996

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Complex Formation of Poly(4-vinylpyridine) with Copper(II) Ion in Mixed Solvent

Nagai

Takahashi

Komatsu

et al. 1988

Polym J

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ABSTRACT:Complex formation of poly(4-vinylpyridine) with Cu(II) ion in a mixed solvent (water-methanol) was investigated potentiometrically, viscometrically, and spectroscopically. Poly(4-vinylpyridinium chloride) was observed to undergo a pH-induced conformational transition. Adding neutral salt caused a reduction in electrostatic repulsion among charges on the polymer chain. The stability of compact form was low, due to hydrophobic interactions among stacked pyridine rings. The maximum average coordination number was nearly three, in spite of the bulky ligand. The polymer chain was constricted by intramolecular complex formation since no charge exists on the ligands. The polymer-metal complex formation was not a stepwise reaction, but a one-step cooperative reaction resulting from the chelate effect of polymer ligands. Formation of an intramoleculer complex for each Cu(II) ion required nine or ten ligand units on the polymer chain, owing to the rigidity of polymer chain and the steric hindrance of bulky pyridine rings. KEY WORDSPolymer-Metal complex / Polyelectrolyte / Mixed Solvent / Potentiometric Titration / Viscosity / Extensive literature is available on the formation and coordination number of polymermetal complexes in aqueous solution. Fourcoordinate square-planar structures are known for Cu(II) ion with poly(vinylamine). 1 • 2 Formation of the four-coordinate complex is easily accomplished since their ligands are small and no steric hindrance is encountered. On the other hand, Cu(II) ion forms twocoordinate complexes with poly(acrylic acid), which has a negative charge and bulky structure. 3 Its complex formation is affected by electrostatic repulsion and steric hindrance among ligands. Although poly(4-vinylpyridine) (PVP) is a bulky ligand, it is reported to give four-coordinate complexes with Cu(II) ion in aqueous solution. 4 Any quantitative estimation of the complex formation is however very difficult since PVP does not dissolve into water. The application of the mixed solvent has therefore been attempted for the analyses of polymer-metal complex formation. 5 In this paper, we studied the complex formation of PVP with Cu(II) ion in the watermethanol mixed solvent. The solvent provides sufficient solubility of PVP to allow potentiometric, viscometric, and spectroscopic measurements. EXPERIMENTAL MaterialsAll the chemicals used were of reagent grade. Poly(4-vinylpyridine) (PVP) was pre-609

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Features of the interaction of Cu(II) ions with poly-4-vinyl pyridine in an acid medium

Cited by 3 publications

References 5 publications

Removal of Metal Ions from Aqueous Solutions by Complexation –Ultrafiltration Hybrid Process: A Bibliographical Overview

Removal of Metal Ions from Aqueous Solutions by Complexation –Ultrafiltration Hybrid Process: A Bibliographical Overview

Dual sorption of metal-ions on a crosslinked resin of 2-acrylamidoglycolic acid and 4-vinylpyridine

Complex Formation of Poly(4-vinylpyridine) with Copper(II) Ion in Mixed Solvent

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