TITLE: The comparative characteristics of adsorbation properties of composites of Fe3O4, Fe3O4 / SiO2 (CHM), Fe3O4 / SiO2 (AM), Fe3O4 / TiO2 (ChM), Fe3O4 / TiO2 (AM) AND Fe3O4 / Al2O3 AS to cations La3 + AND Y3 +