Arsenite adsorption on cryogels embedded with iron-aluminium double hydrous oxides: Possible polishing step for smelting wastewater?

► Double hydrous oxides were synthesized as adsorbents and incorporated into cryogels. ► Removal of As(III) was evaluated for smelting wastewater in continuous mode. ► As(III) adsorption was possible without pre-oxidation and pH adjustment. ► Results indicate chemisorption of As(III) on the adsorbents. ► As(III) concentrations reached below the EU emission limit for industrial wastewater.