TY - JOUR
T1 - Synthetic hydroxyapatites as inorganic cation exchangers. Part 2
AU - Suzuki, Takashi
AU - Hatsushika, Toshiaki
AU - Miyake, Michihiro
N1 - Funding Information:
From these results, we conclude that if cations have large electronegativity values and radii close to the range 0.9-1.3 A then they are more easily removed by the hydroxyapatites. This work was supported by a Grant in Aid for Research from the Japanese Government Ministry of Education. We thank Mrs Hideko Hatsushika for her secretarial help during the preparation of the manuscript.T. S U Z U K I , T. HATSUSHIKA A N D M. MIYAKE 361 1 2.0 1 0 CdvD 0 MI Ca(VI) - I I 0.6 0.7 0.8 0.9 1.0 1 . 1 1 . 2 1.3 1.4 ionic radius/A FIG. 6.-Relationship between electronegativity and ionic radius. See, for example, C. L. Kibby and W. K. Hall, The Chemistry of Biosurfaces (Marcel Dekker, New York, 1972), vol. 2, p. 663. V. Hlady and H. F. Milhofer, J.
PY - 1982
Y1 - 1982
N2 - The removal of cations such as Pb2+, Mn2+, Co2+ and Cu2+ in aqueous solution by four synthetic hydroxyapatites (S-1, S-2, S-3, S-4) has been investigated using both batch and column methods. The removal is due not only to an adsorption effect but also to an ion-exchange reaction between the cations in solution and the Ca2+ ions of the apatites. The order of the ions according to the amount exchanged was as follows: Pb2+ > Cu2+ > Mn2+ ≃ Co2+. Pb2+ ions were readily removed by the apatites and the maximum value for the exchange of Pb2+ ions was 230 mg per g of S-4 apatite. The apatites, particularly S-4, would seem to be possible agents for the removal of toxic Pb2+ ions. The selectivity of the apatites for the cations can be explained by considering the radii and the electronegativities of the ions.
AB - The removal of cations such as Pb2+, Mn2+, Co2+ and Cu2+ in aqueous solution by four synthetic hydroxyapatites (S-1, S-2, S-3, S-4) has been investigated using both batch and column methods. The removal is due not only to an adsorption effect but also to an ion-exchange reaction between the cations in solution and the Ca2+ ions of the apatites. The order of the ions according to the amount exchanged was as follows: Pb2+ > Cu2+ > Mn2+ ≃ Co2+. Pb2+ ions were readily removed by the apatites and the maximum value for the exchange of Pb2+ ions was 230 mg per g of S-4 apatite. The apatites, particularly S-4, would seem to be possible agents for the removal of toxic Pb2+ ions. The selectivity of the apatites for the cations can be explained by considering the radii and the electronegativities of the ions.
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U2 - 10.1039/F19827803605
DO - 10.1039/F19827803605
M3 - Article
AN - SCOPUS:0001752667
VL - 78
SP - 3605
EP - 3611
JO - Physical Chemistry Chemical Physics
JF - Physical Chemistry Chemical Physics
SN - 1463-9076
IS - 12
ER -