Study of the structure of chelate fibrous ionites by IR spectroscopy

Structure of fibrous chelate ion exchangers FIBAN X-1 and FIBAN X-2 prepared by a two-step synthesis was studied by IR Fourier spectroscopy. The first step of the ion exchanger preparation consists in the production of an aminated fiber (AF). The process can be carried out in different phases: either vapor, or aqueous. It is found that conditions of the synthesis of AF affect differently the ion exchanger structure. For the ion exchanger FIBAN X-1 it does not a matter in which phase is AF synthesized, and the FIBAN X-1 sorbent has amidoamine structure. The structure of chelate ion exchanger FIBAN X-2 depends on the conditions of the synthesis of AF. When the process is carried out in aqueous medium the FIBAN X-2 has amidoamine structure, while amination in the vapor phase leads to formation of the FIBAN X-2 ion exchanger mainly containing in its structure imidazoline rings.