This study presents the results of anion sorption investigations using aerogels and nanopowders based on AlO (A), ZrO (Z), and multicomponent systems xAlO–ZrO (xAZ) and xAlO–ZrYbO (xAZYb) with different thermal treatments after sol–gel synthesis. The adsorption of the anionic dye methyl orange (MO) and hexavalent chromium oxyanions from aqueous solutions was studied. The influence of sorbent composition and calcination temperature (180, 500, and 800°C) on anion removal was evaluated based on adsorption isotherms and kinetics at 25°C. Henry constants for methyl orange sorption (L/m²) on samples calcined at 500°C decreased linearly with increasing AlO content. The xAZYb samples exhibited the highest sorption performance for both the dye and dichromate ions compared to xAZ. The studied systems, precursors of alumina–zirconia ceramics, are suitable for adsorption-based removal of anionic pollutants from aqueous media.
N.E. Vakhrushev (Wed,) studied this question.