BENTONITE/IRON OXIDE MAGNETIC COMPOSITES: CHARACTERIZATION AND APPLICATION AS Pb(II) ADSORBENTS

Abstract

The natural clay bentonite (B) as adsorbent of lead cations was studied. To enhance its adsorption
capacity, the coating by iron oxide particles, in two selected weight ratios: 2:1 (BM1) and 4:1(BM2),
was used. The changes of the textural and surface parameters after the modification were studied by the
low temperature nitrogen adsorption, XRD and SEM method, Mössbauer spectroscopy. The Pb(II)
adsorption experiments were studied under the different conditions, such as pH of the model solutions,
contact time and initial metal ion concentration. Higher adsorption rates of BM1 and BM2 samples
were observed for lower initial metal ion concentrations.