| abstract |
The invention relates to the fixation or separation of ions, in particular of Pb, by per (3, 6-anhydro) cyclodextrin derivatives. This can be carried out by contacting the medium containing the ions to be fixed or separated, with a derivative of per (3, 6-anhydro) cyclodextrin of formula: (CF DRAWING IN BOPI) and (CF DRAWING IN BOPI) in which one or less of R1 represents OCH3, the other R1 possibly representing OCH3, OH or d ' other groups, to complex the ions. Preferably, for the binding of lead, the derivative corresponds to formula (I) with n = 6 and all the R1 = OCH3. |