en Research Paper Research Paper <span style="font-size:11pt"><span style="line-height:200%"><span sans-serif="" style="font-family:Calibri,"><span lang="EN-US" new="" roman="" style="font-family:" times="">In this work, blast furnace slag (BFS) was used as an adsorbent material for the removal of Pb(II) ions in solution in batch mode. </span><span lang="EN-GB" new="" roman="" style="font-family:" times="">The physico-chemical analyzes used indicated that the BFS is essentially composed of silica, lime, and alumina. </span><span lang="EN-US" new="" roman="" style="font-family:" times="">Its specific surface area corresponds to</span><span lang="EN-GB" new="" roman="" style="font-family:" times=""> 275.8m²/g and its PZC is around 3.8.</span></span></span></span><br> <span style="font-size:11pt"><span style="line-height:200%"><span sans-serif="" style="font-family:Calibri,"><span lang="EN-US" new="" roman="" style="font-family:" times="">The adsorption study indicated that the maximum amount of Pb(II) adsorbed under optimum conditions (agitation speed (V_ag): 150rpm; pH: 5.4; particle size (&Oslash;s): 300&micro;m, T: 20&deg;C) is 34.26mg/g after 50 minutes of agitation,</span> <span lang="EN-US" new="" roman="" style="font-family:" times="">and adsorption yield is best for feeble initial concentrations. The most appropriate isothermal model was that of Langmuir, and the adsorption speed was better characterized by the pseudo-second order kinetic model. The adsorption mechanism revealed that internal diffusion is not the only mechanism that controls the adsorption process; there is also external diffusion, which contributes enormously in the transfer of Pb(II) from solution to adsorbent. Thermodynamic study indicated that the Pb(II) adsorption on the blast furnace slag (BFS) was spontaneous, exothermic, and that the adsorbed Pb(II) is more ordered at the surface of the adsorbent. Finally, we estimate that BFS is a superb adsorbent for water containing Pb(II).</span></span></span></span><br> &nbsp; Adsorption,Slag,Pb(II),Kinetics,depollution 1 13 http://ijmse.iust.ac.ir/browse.php?a_code=A-10-4702-1&slc_lang=en&sid=1 chouchane toufik chouchane_toufik@yahoo.fr 1800319475328460017048 1800319475328460017048 Yes Research Center in Industrial Technologies CRTI Sana Chibani s.chibani@crti.dz 1800319475328460017049 1800319475328460017049 No Research Center in Industrial Technologies CRTI Ouahida Khireddine o.khireddine@crti.dz 1800319475328460017050 1800319475328460017050 No Research Center in Industrial Technologies CRTI Atmane Boukari a.boukari@crti.dz 1800319475328460017051 1800319475328460017051 No Research Center in Industrial Technologies CRTI