Metal-ion extraction by immobilised aza crown ethers

L.G.A. van de Water, W.L. Driessen, J. Reedijk, D.C. Sherrington

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

The immobilisation of [15]aneNO(4), [15]aneN(2)O(3), and [18]aneN(2)O(4) onto the oxirane and thiirane containing copolymers p(GMA-O) and p(GMA-S) resulted in six aza crown ether containing polymers with interesting metal-ion affinities, The pendent hydroxy or thiol groups, originating from the polymeric backbones, appeared to play an important role in the observed metal-ion affinities. The metal-ion affinity of p(GMA-O)-[15]aneN(2)O(3) for a range of cations was found to decrease with decreasing ionic radius: Ag+ > Pb2+ > Cd2+ > Cu2+. The thiol-containing analogue of this polymer, p(GMA-S)-[15]aneN(2)O(3), showed a reversed Cd2+/Cu2+ selectivity. This illustrates the capability of pendent hydroxy groups to seriously reduce the stability of complexes of small cations compared to those of large cations. All the modified oxirane resins tested were found to be Ag+-selective in the presence of a range Of divalent (heavy) transition-metal ions. The difference in ring size between [15]aneN(2)O(3) and [18]aneN(2)O(4) was found to have a significant effect on the uptake values of Cu2+ and Zn2+, as these ions are too small to fit into the ligand cavity of [18]aneN(2)O(4). The uptake values for the larger Ag+ and Pb2+ were found to be similar for both resins, Loaded resins were successfully regenerated (with an efficiency of 99%) by treatment with 2.0 m acid solutions (Pb2+ and Cd2+) or with a 3.35 m NH3 + 2.0 m NH4NO3 solution (Ag+).
Original languageEnglish
Pages (from-to)221-229
Number of pages8
JournalEuropean Journal of Inorganic Chemistry
Volume2002
Issue number1
DOIs
Publication statusPublished - Jan 2002

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Crown Ethers
Metal ions
Cations
Ethylene Oxide
Resins
Sulfhydryl Compounds
Polymers
Heavy metals
Transition metals
Copolymers
Ions
Ligands
Acids

Keywords

  • aza crown ethers
  • functional polymers
  • cadmium
  • silver

Cite this

van de Water, L.G.A. ; Driessen, W.L. ; Reedijk, J. ; Sherrington, D.C. / Metal-ion extraction by immobilised aza crown ethers. In: European Journal of Inorganic Chemistry. 2002 ; Vol. 2002, No. 1. pp. 221-229.
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abstract = "The immobilisation of [15]aneNO(4), [15]aneN(2)O(3), and [18]aneN(2)O(4) onto the oxirane and thiirane containing copolymers p(GMA-O) and p(GMA-S) resulted in six aza crown ether containing polymers with interesting metal-ion affinities, The pendent hydroxy or thiol groups, originating from the polymeric backbones, appeared to play an important role in the observed metal-ion affinities. The metal-ion affinity of p(GMA-O)-[15]aneN(2)O(3) for a range of cations was found to decrease with decreasing ionic radius: Ag+ > Pb2+ > Cd2+ > Cu2+. The thiol-containing analogue of this polymer, p(GMA-S)-[15]aneN(2)O(3), showed a reversed Cd2+/Cu2+ selectivity. This illustrates the capability of pendent hydroxy groups to seriously reduce the stability of complexes of small cations compared to those of large cations. All the modified oxirane resins tested were found to be Ag+-selective in the presence of a range Of divalent (heavy) transition-metal ions. The difference in ring size between [15]aneN(2)O(3) and [18]aneN(2)O(4) was found to have a significant effect on the uptake values of Cu2+ and Zn2+, as these ions are too small to fit into the ligand cavity of [18]aneN(2)O(4). The uptake values for the larger Ag+ and Pb2+ were found to be similar for both resins, Loaded resins were successfully regenerated (with an efficiency of 99{\%}) by treatment with 2.0 m acid solutions (Pb2+ and Cd2+) or with a 3.35 m NH3 + 2.0 m NH4NO3 solution (Ag+).",
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Metal-ion extraction by immobilised aza crown ethers. / van de Water, L.G.A.; Driessen, W.L.; Reedijk, J.; Sherrington, D.C.

In: European Journal of Inorganic Chemistry, Vol. 2002, No. 1, 01.2002, p. 221-229.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Metal-ion extraction by immobilised aza crown ethers

AU - van de Water, L.G.A.

AU - Driessen, W.L.

AU - Reedijk, J.

AU - Sherrington, D.C.

PY - 2002/1

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N2 - The immobilisation of [15]aneNO(4), [15]aneN(2)O(3), and [18]aneN(2)O(4) onto the oxirane and thiirane containing copolymers p(GMA-O) and p(GMA-S) resulted in six aza crown ether containing polymers with interesting metal-ion affinities, The pendent hydroxy or thiol groups, originating from the polymeric backbones, appeared to play an important role in the observed metal-ion affinities. The metal-ion affinity of p(GMA-O)-[15]aneN(2)O(3) for a range of cations was found to decrease with decreasing ionic radius: Ag+ > Pb2+ > Cd2+ > Cu2+. The thiol-containing analogue of this polymer, p(GMA-S)-[15]aneN(2)O(3), showed a reversed Cd2+/Cu2+ selectivity. This illustrates the capability of pendent hydroxy groups to seriously reduce the stability of complexes of small cations compared to those of large cations. All the modified oxirane resins tested were found to be Ag+-selective in the presence of a range Of divalent (heavy) transition-metal ions. The difference in ring size between [15]aneN(2)O(3) and [18]aneN(2)O(4) was found to have a significant effect on the uptake values of Cu2+ and Zn2+, as these ions are too small to fit into the ligand cavity of [18]aneN(2)O(4). The uptake values for the larger Ag+ and Pb2+ were found to be similar for both resins, Loaded resins were successfully regenerated (with an efficiency of 99%) by treatment with 2.0 m acid solutions (Pb2+ and Cd2+) or with a 3.35 m NH3 + 2.0 m NH4NO3 solution (Ag+).

AB - The immobilisation of [15]aneNO(4), [15]aneN(2)O(3), and [18]aneN(2)O(4) onto the oxirane and thiirane containing copolymers p(GMA-O) and p(GMA-S) resulted in six aza crown ether containing polymers with interesting metal-ion affinities, The pendent hydroxy or thiol groups, originating from the polymeric backbones, appeared to play an important role in the observed metal-ion affinities. The metal-ion affinity of p(GMA-O)-[15]aneN(2)O(3) for a range of cations was found to decrease with decreasing ionic radius: Ag+ > Pb2+ > Cd2+ > Cu2+. The thiol-containing analogue of this polymer, p(GMA-S)-[15]aneN(2)O(3), showed a reversed Cd2+/Cu2+ selectivity. This illustrates the capability of pendent hydroxy groups to seriously reduce the stability of complexes of small cations compared to those of large cations. All the modified oxirane resins tested were found to be Ag+-selective in the presence of a range Of divalent (heavy) transition-metal ions. The difference in ring size between [15]aneN(2)O(3) and [18]aneN(2)O(4) was found to have a significant effect on the uptake values of Cu2+ and Zn2+, as these ions are too small to fit into the ligand cavity of [18]aneN(2)O(4). The uptake values for the larger Ag+ and Pb2+ were found to be similar for both resins, Loaded resins were successfully regenerated (with an efficiency of 99%) by treatment with 2.0 m acid solutions (Pb2+ and Cd2+) or with a 3.35 m NH3 + 2.0 m NH4NO3 solution (Ag+).

KW - aza crown ethers

KW - functional polymers

KW - cadmium

KW - silver

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