Special features of complex formation in the system Co2+-polyethylenimine

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

doi:10.1016/0032-3950(81)90166-0

Cited by 8 publications

(9 citation statements)

References 9 publications

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“…The binding constants of the complexes can be determined by pH measurements, by potentiometric titration with specific electrodes, or by polarography (Jarvis and Wagener, 1995;Kobayashi et al, 1987;Pshezhetskii and Polinskii, 1981;Rumeau et al, 1992;Thiele and Gronau, 1963;Zezin et al, 1977). They can be also determined through the change of some specific, nonthermodynamic properties of either species involved (Mandel, 1988); e.g., the changes in the IR, visible, and UV absorption spectra of groups on the polymer chain or of the bound metallic complexes, or both (Geckeler et al, 1980;Perrine and Landis, 1967;Pshezhetskii and Polinskii, 1981). It is also possible to evaluate the binding constants by UF or equilibrium dialysis of solutions of metal ions and polymeric ligands (Ahmadi et al, 1994;Buffle and Staub, 1984;Juang and Liang, 1993;Masse et al, 1987;Pshezhetskii and Polinskii, 1981;Rumeau et al, 1992).…”

Section: Introductionmentioning

confidence: 99%

Measurement of Binding Constants of Poly(ethylenimine) with Metal Ions and Metal Chelates in Aqueous Media by Ultrafiltration

Juang

Chen

1996

Ind. Eng. Chem. Res.

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Equilibrium constants for the binding of poly(ethylenimine) (PEI) with metal ions and metal chelates of ethylenediaminetetraacetic acid and nitrilotriacetic acid in the aqueous sulfate solutions were determined by batch ultrafiltration (UF) in the pH range of 3.0−3.8. The average coordination number of PEI groups interacting with one metal ion and metal chelate was also obtained by varying the initial concentration ratio of PEI to metal ion. A simple chemical equilibrium model proposed in this work enabled us to satisfactorily predict the rejection coefficient of UF of metal ions and metal chelates in the presence of PEI. Also, the effect of the formation of soluble hydroxy complexes of metal chelates on their retention was emphasized.

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Section: Introductionmentioning

confidence: 99%

Measurement of Binding Constants of Poly(ethylenimine) with Metal Ions and Metal Chelates in Aqueous Media by Ultrafiltration

Juang

Chen

1996

Ind. Eng. Chem. Res.

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“…If the macromolecule is a synthetic polymer, containing functional groups that are able to act as ligands in complex formation reactions, the functional groups of the polymer chain, which can been considered as independent each others, are added to the central metal ions, successively [30] or simultaneously [31,32].…”

Section: Ii22 the Macrocomplex Formationmentioning

confidence: 99%

“…In fact, the macromolecular charge is changed during complexation, consequently, a reorganization of the macromolecular conformation occurs, indicated by a change in viscosity of the system [31,35]. Simultaneously, the acid-base properties of the polymer are changed [32,37] and therefore the properties of the macromolecular ligand are changed as a whole.…”

Section: Ii22 the Macrocomplex Formationmentioning

confidence: 99%

“…Both synthetic hydrosoluble polymers and biopolymers have been used. In the range of synthetic water-soluble polymeric macroligands, poly(ethyleneimine) [32,47] and poly(acrylic acid) seem to be the most employed polymers [23,24,56], followed by poly(vinyl alcohol) [59,60,65], poly-4-vinylpyridine [31], poly[acrylamideco-1-(2-hydroxyethyl)aziridine] [51] and poly(allylamine) [53]. The most employed biopolymers are chitosan and chitosan derivatives.…”

Section: Applications Of the Processmentioning

confidence: 99%

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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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“…The polybase nature of PEI ensures high ability of the macromolecule to form complexes with transition metal ions [2]. Sorbents can be jprepared both from unmodifi ed cross-linked PEI [3][4][5][6] and from the functionalized polymer [6][7][8][9][10][11][12].…”

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confidence: 99%

Preparation of a chelating sorbent based on pyridylethylated polyethylenimine for recovering transition metal ions

et al. 2013

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Abstract-A method was developed for preparing a chelating amino polymer, pyridylethylpolyethylenimine with maximal degree of substitution, by polymer-analogous transformations of branched polyethylenimine in reaction with 2-vinylpyridine. The ability of cross-linked pyridylethylpolyethylenimine with the degree of substitution of 0.32 to sorb Cu 2+ , Ni 2+ , Co 2+ , Zn 2+ , Cd 2+ , Mn 2+ , and Pb 2+ ions present simultaneously in solution was evaluated. In an ammonium acetate sorption system (pH 3.5-4.0), the sorbent selectively interacts with Cu(II) ions.

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Special features of complex formation in the system Co2+-polyethylenimine

Cited by 8 publications

References 9 publications

Measurement of Binding Constants of Poly(ethylenimine) with Metal Ions and Metal Chelates in Aqueous Media by Ultrafiltration

Measurement of Binding Constants of Poly(ethylenimine) with Metal Ions and Metal Chelates in Aqueous Media by Ultrafiltration

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

Preparation of a chelating sorbent based on pyridylethylated polyethylenimine for recovering transition metal ions

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