NEW SORBENTS BASED ON TIACROWN ETHERS: PREPARATION AND APPLICATION FOR SILBER EXTRACTION

The ability of crown ether compounds to effectively react with metal ions underlies their practical use. The selectivity of compounds depends on the structure of the ligands in the molecule, the presence of functional groups and donor atoms in it. It is known that the high selectivity of the reagents depends not only on the nature of the donor atoms in the ring, but also on the stability of the ring structure. The preparation of polymers containing a thiacrown ether group is an urgent task, since such groups make it possible to obtain selective sorbents. The purpose of this work is the synthesis of new selective sorbents containing a thiacrown ether group and the study of their complexing properties with respect to silver ions. To obtain polymers for this purpose, the reaction of the interaction of a gel and a porous copolymer of chloromethylated styrene and divinylbenzene (HMS) with aminobenzothiacrown ethers was studied. Using various influencing factors, it was possible to obtain sorbents with a high exchange capacity (2.5 mmol/g). When studying the sorption of silver(I) ions from aqueous solutions by a supramolecular sorbent with a thiacrown ether group, it was shown that the optimal pH value is 6, the contact time is 60 min. The maximum sorption capacity of the sorbent for silver (I) ions reaches 240.8 mg/g.