Pylypenko I. Synthesis and sorption properties of micro/mezoporous systems based on pillared montmorillonite

Work devoted to the synthesis and research of physicochemical properties of montmorillonites pillared with polynuclear (Al, Zr, Ti, Fe) and heteropolynuclear (Al/Fe, Al/Zr and Al/Ti) hydroxocomplexes of metals in the interlayer space. It is shown that intercalation of polyhydroxocomplexes with different composition to interlayer space of montmorillonite allows to obtain materials with high specific surface area (150-250) m2/g and developed micro/mezoporous structure. It was shown that samples of montmorillonite intercalated by heteropolynuclear complexes of Zr/Al and Fe/Al have 1,3-1,5 times greater sorption capacity to remove ions of chromium (VI) and uranium (VI), than intercalated by polynuclear complexes of one type. Sorption properties of intercalated montmorillonites were investigated for removing of cobalt, chromium and uranium from sulfate-carbonate-chloride-calcium mineralized groundwater in areas of extraction and processing of radioactive uranium ore. The method of granulation of intercalated montmorillonite using sodium alginate and polyvinyl alcohol is suggested and rheological properties of such systems in the presence of cationic surfactants were investigated. The efficiency of obtained granular pillared montmorillonites in continuous sorption processes was shown.