ADSORPTION OF ARSENIC, CHROMIUM, LEAD, CADMIUM BY ADSORBENTS ON THE BASIS OF Zr(IV), Ti(IV), Sn(IV), Al(III), Fe(III) OXIDES

Abstract

It was studied sorption of As (V), Cr (VI), Cu (II), Cd (II), Pb (II) ions by inorganic and or ganic-inorganic ionites based on hydrated oxides of Zr (IV), Ti (IV), Sn ( IV), Al (III), Fe (III) f rom isotherms of sorption and values of the distribution coefficients are calculated. High selectivity of oxides was observed in the presence of singly charged competing ions. It was found that in the case of the use of Zr (IV), Ti (IV), Sn (IV) oxyhydrates as a hybrid ionite in the composition, regeneration of 0.1 M with NaOH results in a 70-80% reduction in the absorptivity . The use of Fe (III) oxide as adsorbent leads to formation of intraspheric complexes. In this case, regeneration of ion-exchange adsorbents is difficult and requires higher concentrations of regenerating reagents and/or energy inputs.