Chaban M. Features of sorption of Li+ ions by composite sorbents based on titanium dioxide and Ti- and Mn-containing spinel

The work is devoted to an urgent scientific task – the study of sorption phenomena during the extraction of lithium ions from aqueous solutions using sorption materials. Methods for the synthesis of selective titanium-manganese materials with the directed formation of mesopore-nanoreactors of a certain volume in xerogels of inorganic sorbents were developed for the first time; sorbents in the form of large mechanically strong granules were obtained; regularities of dependences of sorption characteristics on the content and composition of lithium spinel were found. It has been shown that composite materials based on hydrated titanium and manganese oxides make it possible to selectively extract Li+ from solutions with a significant salt background (in particular, with a high content of Na+, Ca+, Mg+). It has been established that the sorption-regeneration of the synthesized sorbents can be carried out many times, and the regenerating solution can be used for 7-10 cycles to achieve the maximum possible concentration of Li+ ions. Based on these studies, a method for processing the eluate, which is formed during the regeneration of sorbents, has been developed. It is also proposed to integrate the sorption extraction of Li+ ions to the reverse osmosis desalination of seawater or a combination of sorption and electrodialysis.