Solid-liquid extraction of Cu(II) and Zn(II) by organic-inorganic hybrid silicas doped by acidic ligands [Extraction liquide-solide de Cu(II) et de Zn(II) par des silices hybrides organiques-inorganiques dopées par des ligands acides]

Solid-liquid extraction of cu(ii) and zn(ii) was studied in a sulfate medium by mesotructured hybrid silicas doped with acidic chelators. different factors were studied,such as the ionic strength and the ph of the aqueous phase,extraction kinetics and the retention capacity of the cations on solids. cations are extracted at very acidic ph. the separation of the couple cu(ii)-zn(ii) can be carried out by fixing the ph of the aqueous phase at ph lower than those of the extraction of zinc. the stripping of cu(ii) and zn(ii) from loaded solids in an acidic medium,is superior to 90%,with conservation of the structure of solids.