TLC-grade silica gel was functionalized with 8-hydroxyquinoline via a catal
yzed Mannich amminomethylation reaction. The resulting solid was characteri
zed by FT-IR and used as a sorbent for 0.05-5 mmol.L-1 Cu(II), Cd(II), Zn(I
I), Pb(II), and Fe(III) from aqueous solutions in the batch mode. Experimen
ts were carried our in both single and multiple cation solutions. The influ
ence of the aqueous media composition on the adsorption process, the possib
le adsorbed species, and the adsorption kinetics are discussed. Overall equ
ilibrium constants for these processes are reported.