A. Denizli et al., Magnetic polymethylmethacrylate microbeads carrying amine functional groups for removal of Pb(II) from aqueous solutions, J MACR S PU, 37(12), 2000, pp. 1647-1662
Citations number
27
Categorie Soggetti
Organic Chemistry/Polymer Science
Journal title
JOURNAL OF MACROMOLECULAR SCIENCE-PURE AND APPLIED CHEMISTRY
Magnetic polymethylmethacrylate [mPMMA] microbeads (150-200 mum in diameter
) carrying hexamethylene diamine (HMDA) were prepared for the removal of Pb
(II) ions from aqueous solutions containing different amounts of Pb(II) ion
s (5-100 mg/L) and at different pH values (2.0-6.0). Adsorption rates were
observed as high at the beginning of the adsorption process, and then equil
ibrium was reached in about 20 minutes. Adsorption of Pb(II) ions on the un
modified mPMMA microbeads was negligible (4.2 mu mol/g). While HMDA-incorpo
ration significantly increased the Pb(II) adsorption was (128 mu mol/g). Th
e adsorption of Pb(II) ions increased with an increasing pH, and reached a
plateau value at around pH 5.0. The optimal pH range for Pb(II) removal was
shown to be from 5.0 to 6.0. Desorption of Pb(II) ions was achieved using
0.1 M HNO3. The maximum desorption value was as high as 98%. These microbea
ds are suitable for repeated use for more than five adsorption-desorption c
ycles without a considerable loss of adsorption capacity.