Uptakes of Cu
2+, Pb
2+ and Zn
2+ on various synthetic hydrotalcite (HT-0O
3, HT-SO
4, HTCl and HT-NO
, ) were investigated in Cu(NO
3)
2, Pb(NO
3)
2, Pb(NO
3)
2 and Zn(NO
3)
2 aqueous solution (each conc.: 2000 mgdm-3). Hudrotalcite has a pronounced activity for the uptakes of Cu
2+, Pb
2+ and Zn
2+. Amounts of Cu
2+, Pb
2+ and Zn
2+ removed by HT-0O
3 are about 1.7 mmol Cu/g, 1.0 mmol Pbfg -and 1.2 mmol Zn/g. In a mixed solution of Cu
2+, Pb
2+ and Zn
2+ (the concentration of each ions: 20 mmoldm
-3), the order of activity for the uptak es of each ions on HT-0O
3, HT-SO
4, HT-Cl and HT-NO, are Pb>Cu>Zn, Cu>Pb>Zn, Pb>Cu>Zn and Cu>Pb>Zn. When the HT-0O
3 was immersed into the Pb(NO
3)
2 solution, a part of the Me-, OH- and CO
3- of HT-CO
3 (Mg
6Al
2(0F1)
16CO
34 H
20) dissolve into the solution. The dissolved OH- and CO
32- causes the Pb
2+ to precipitate as Pb
3(OH)
2 (CO
3)
2 on the surface of the HT-CO
3.
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