Siryk O. Supramolecular sorbents based on silica gel and crystalline cellulose with immobilized polyhexamethyleneguanidine

Supramolecular sorbents based on silica gel (SG) and crystalline cellulose, sequentially modified with polyhexamethyleneguanidine hydrochloride (PHMG) and organic anionic reagents have been developed; the colloid-chemical features for all surface structure parts sorption as well as metal ions sorption on the obtained materials are established; methods of concentration and determination of PHMGC, anionic synthetic food dyes and metal ions based on the use of the obtained sorbents have been developed. High efficiency of extraction of polyhexamethyleneguanidine by silica and crystalline cellulose has been proved. A method of obtaining a sorbent [SG-PHMG] with a stable composition is proposed. It was first proposed to use crystalline cellulose to concentrate PHMG for subsequent determination of its low concentrations in solution after desorption. It has been shown that silica gel with immobilized PHMG is an effective sorbent for concentration of synthetic food dyes (tartrazine, sunset yellow, azorubine, brilliant blue, indigocarmine and chocolate brown) from aqueous solutions. The conditions of creation of supramolecular structures on the surface of [SG-PHMG] by its treatment with solutions of pyrocatechol violet, EDTA, xylenol orange, unithiol and 2-mercapto-5-benzimidazolesulfonic acids and their use for extraction and separation of toxic metals are considered. A number of methods for the determination of synthetic food colorings and metal ions directly in the sorbent phase (luminescent, colorimetric, solid-phase photometric and visual-test), as well as in solution after desorption (photometric and atomic emission methods) were developed using these systems.