The Effects of Concentrations of Zirconium(IV) Sulphate and Sulphuric Acid on Sorption of Zirconium(IV) and Hafnium(IV) on Purolite S-957 Resin. Adsorption Isotherms of Zirconium(IV) and Hafnium(IV) Ions

Abstract

The optimal conditions of separation of zirconium(IV) from hafnium(IV) on Purolite S-957 ion-exchange resin in their sulfate aqueous solutions using a static method has been determined to be 0,07 M Zr(SO 4 ) 2 (containing 2% Hf) in 0,5 M H 2 SO 4. Higher Zr(IV) concentration causes a lowering of the Zr/Hf separation efficiency due to the oligocondensation of mononuclear Zr(IV) and Hf(IV) ions resulting in the formation of Zr(IV) or mixed Zr(IV)-Hf(IV) oligohydroxo-sulfato ions, which is not prevented by the parallel increase of acidity of the solution. The same effect can be observed when analyzing the shapes of adsorption isotherms, which are similar for both Zr(IV) and Hf(IV).

Uranium(VI) and zirconium(IV) sorption on magnetic chitosan derivatives – effect of different functional groups on separation properties

“…In the treatment of metal‐contaminated wastewater and in the valorization of low‐grade minerals or waste materials the effluents are generally at concentration levels (for target metals) that are not competitive for application of processes such as solvent extraction . Sorption processes offer alternatives to these techniques for the recovery of metal ions from low concentration solutions …”

“…1,2 Sorption processes offer alternatives to these techniques for the recovery of metal ions from low concentration solutions. [3][4][5][6][7][8] The complexity of these effluents makes the separation of the metals strongly challenging. There is still a need for developing alternative sorbents to synthetic petro-sourced resins.…”