The sorbents based on mesoporous MCM-41 silica have been synthesized via the impregnation of N’,N’-dimethylhydrazides of branched Versatic acids at different modification times. The textural and structural properties of the studied silicas have been determined. The optimal conditions for the sorption extraction and separation of rhenium (VII) and molybdenum (VI) ions have been determined. The adsorption mechanism has been shown to include the following two steps: first, the process is limited by external diffusion of the ions to the sorbent surface, then by internal diffusion. The adsorption isotherms are described by the Freundlich equation for an energetically inhomogeneous surface.

— We have synthesized silica-based sorbents with MCM-41 and MCM-48 pore structures, modified with hydrazide groups based on tret-carboxylic acids of Versatic 10 and Versatic 1519 fractions,...

Physicochemical properties of mesoporous silicas modified with hydrazide and amide functional groups were studied. It was found that the main properties of the sorbents under study, characterized by p...