Ryabchenko K. Synthesis and sorption properties of composites based on solid carriers with in situ immobilized polyaniline

Novel composite materials have been synthesized by the one-step in situ immobilization of polyaniline on the surface of silica gel, vermiculite, bentonite and pine shavings. The changes in the structural characteristics of the surface of minerals after modification with polyaniline were studied. It was shown that all synthesized composites are characterized by the higher sorption capacity with respect to oxo anions of Cr(VI), Mo(VI), W(VI) and V(V) compared with the pristine carriers. Sorption capacities of silica-polyaniline composite towards cations Cu(II), Co(II), Mn(II), Ni(II), Pb(II) and Fe(III) are low. Anchorage complexing reagents (8-hydroxyquinoline, PAN, PAR) on the silica-polyaniline composite by aminomethylation reaction somewhat increases the sorption capacity of the composite. The method of regeneration of chromium, molybdenum, tungsten and vanadium was proposed by burning with oxidants pine shavings-polyaniline composite with sorbed metals. This method was shown to allow effective (over 90 %) metals regeneration after sorption from model solutions separate metal-containing oxo anions.