Abstract
| Original language | English |
|---|---|
| Pages (from-to) | 221-229 |
| Number of pages | 8 |
| Journal | European Journal of Inorganic Chemistry |
| Volume | 2002 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - Jan 2002 |
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Keywords
- aza crown ethers
- functional polymers
- cadmium
- silver
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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 journal › Article
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
Y1 - 2002/1
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
UR - http://www3.interscience.wiley.com/cgi-bin/fulltext/88512490/PDFSTART
UR - http://dx.doi.org/10.1002/1099-0682(20021)2002:1<221::AID-EJIC221>3.0.CO;2-#
U2 - 10.1002/1099-0682(20021)2002:1<221::AID-EJIC221>3.0.CO;2-#
DO - 10.1002/1099-0682(20021)2002:1<221::AID-EJIC221>3.0.CO;2-#
M3 - Article
VL - 2002
SP - 221
EP - 229
JO - European Journal of Inorganic Chemistry
JF - European Journal of Inorganic Chemistry
SN - 1434-1948
IS - 1
ER -