Materials for the solid/liquid extraction of heavy metal ions, containing supported n-functionalized polyazacyloalkanes

A material adapted for extracting metal cations in an aqueous medium, comprising a solid support (S) on which are attached covalently polyazacycloalkane compounds (PACs) having a ring including at least 4 nitrogen atoms, and wherein each of the nitrogen atoms of the ring is substituted with a coordinating group, each of the coordinating groups borne by the nitrogen atoms of the ring of a polyazacycloalkane compound (PAC) bound to the support (S) being, independently of each other:

• a coordinating group Rc fitting the following general formula:
• —(CH2)n—C(═O)—NR1R2
• wherein
• n=1, 2 or 3;
• R1 and R2 are identical of different and each of them represents a hydrogen atom or an alkyl radical comprising 1 to 4 carbon atoms, or an alkenyl radical comprising 1 to 4 carbon atoms or an aryl radical;
• or else
• a coordinating and binding group RcL, fitting the general formula below:
• (CH2)p—C(═O)—NR3-(A)-[support]
• wherein:
• p=1, 2 or 3;
• R3 represents a hydrogen atom, or an alkyl radical comprising 1 to 4 carbon atoms, or an alkenyl radical comprising 1 to 4 carbon atoms, or an aryl radical;
• -(A)- represents a saturated or unsaturated, linear or branched hydrocarbon chain, bound by at least one covalent bond to the solid support (S).