Zinc extraction from dilute aqueous solutions,by hydrogels of polyacrylic acid-polyacrylate sodium [Extraction du zinc à partir des solutions aqueuses diluées,par d'hydrogels d'acide polyacrylique-polyacrylate de sodium]

The present workrelates to the extraction of metal cation zn2+ in acid medium,from dilute aqueous solutions by the gel of polyacrylic acide-polyarylate sodium. the kinetic study of this extraction showed that equilibrium is relatively fast. the decrease in concentration of zinc is accompanied by an increase in ph of supernatant solution. this is due to acid-base rearrangement of the gel with the metal solution (gel swells by consuming protons),and binding capacity of the zinc gel is influenced by two parameters: the ionization rate: rapid extraction with better performance requires the use of highly ionized gels. the ph of the supernatant solution: the increase thereof leads to an increase of r until reaching a plateau at r=0.25 where the ph imposed on the supernatant solution is 4.5. in addition,the use of gels of increasing mass and successive gels respectively allows improving considerably the efficiency of the extraction and depleted completely the aqueous solution by zn2+.