title: The removal of some rare earth elements from their aqueous solutions on by-pass cement dust (BCD).
abstract: The sorption behavior of yttrium (Y(3+)), neodymium (Nd(3+)), gadolinium (Gd(3+)), samarium (Sm(3+)) and lutetium (Lu(3+)) from their aqueous solutions by by-pass cement dust (BCD) has been investigated using a batch technique. The sorption on BCD was studied as a function of pH, shaking time, initial concentration, mass of BCD and temperature. It was found that the sorption capacity of BCD had the order of Lu(3+) > Sm(3+) > Y(3+) > Gd(3+) ≈ Nd(3+) following Freundlich isotherm at the determined optimum conditions. The results also demonstrated that the sorption data fit well the pseudo-second-order kinetic model. Thermodynamic parameters such as ΔH°, ΔS° and ΔG° indicated that the sorption of the investigated REEs on BCD was endothermic, favored at high temperature and spontaneous in nature.
authors.affiliation: Faculty of Science, Helwan University, Ain Helwan, Cairo, Egypt.
authors.forename: O I M
authors.initials: OI
authors.lastname: Ali
authors.forename: H H
authors.initials: HH
authors.lastname: Osman
authors.forename: S A
authors.initials: SA
authors.lastname: Sayed
authors.forename: M E H
authors.initials: ME
authors.lastname: Shalabi
mesh_terms: D004391:Dust; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008674:Metals, Rare Earth / Q000302:isolation & purification*; D012996:Solutions; D013499:Surface Properties; D013816:Thermodynamics; D014867:Water / Q000737:chemistry*
chemical_list: D004391:Dust; D008674:Metals, Rare Earth; D012996:Solutions; D014867:Water