A. Denizli et al., Batch removal of lead ions from aquatic solutions by polyethyleneglycol-methacrylate gel beads carrying Cibacron Blue F3GA, ENV TECHNOL, 21(6), 2000, pp. 609-614
Polyethyleneglycolmethacrylate [PEG-MA] gel beads (100-120 mu m in diameter
) carrying Cibacron Blue F3GA (42.6 mu mol g(-1) polymer) were prepared for
the removal of Pb(II) ions from aqueous solutions containing different amo
unt of these ions (10-600 mg l(-1)) and at different pH values (2.0-6.4). F
b(II) adsorption capacity increases with the time during the first 20 min a
nd then levels off toward the equilibrium adsorption capacity. Adsorption o
f Pb(ID ions on the unmodified PEG-MA gel beads was zero. Cibacron Blue F3G
A-immobilisation significantly increased the Pbm) adsorption (23.3 mg g(-1)
polymer). Langmuir adsorption model was found to be applicaple in interpret
ing lead adsorption by Cibacron Blue F3GA-immobilised PEG-MA gel beads. The
adsorption of Pb(II) ions increased with increasing pH and reached a plate
au value at around pH 5.0. The optimal pH range for Pb(II) adsorption was s
hown to be from 5.0 to 6.0. PEG-MA gel beads can be regenerated by washing
with a solution of nitric acid (0.1 M). The maximum regeneration value was
as high as 98%. These PEG-MA gel beads are suitable for repeated use for mo
re than three adsorption-desorption cycles without considerable loss of ads
orption capacity.