NEW POLYMERIC SORBENTS WITH THIACROWN-ETHER GROUPS

Abstract

Absract: Introduction. 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 the 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. Results and discussions: To obtain polymers for this purpose, the reaction of the
interaction of a gel and a porous copolymer of chloromethylated styrene and divinylbenzene 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 capacityof the sorbent for silver
(I) ions reaches 240.8 mg/g. Conclusion: Thus, the ability of the proposed polymer sorbents to
complexation depends on the ratio of reagents, the nature of the silver-containing reagent, the size of the
macrocycle and the dentinity of the ligand, which is determined by the amount of sulfur in thiacrown
esters.