Eren, E.Afsin, B.Onal, Y.2024-08-042024-08-0420090304-38941873-3336https://doi.org/10.1016/j.jhazmat.2008.04.020https://hdl.handle.net/11616/94696This paper presents the adsorption of Pb(II) from aqua solutions onto Unye (Turkey) bentonite in raw (RB), acid activated (AAB) and manganese oxide-coated (MCB) forms. Adsorption of Pb(H) by RB, AAB and MCB sample was investigated as a function of the initial Pb(II) concentration, solution pH, ionic strength, temperature and inorganic ligand (Cl-). Changes in the surfaces and structure were characterized by means of XRD, IR and potentiometric titration. The Langmuir monolayer adsorption capacities of RB, AAB and MCB in 0.1 M KNO3 solution were estimated as 16.70, 8.92 and 58.88 mg/g, respectively. The spontaneity of the adsorption process is established by decrease in Delta G which varied from -21.60 to -28.60kJ/mol (RB), -22.63 to -29.98 kJ/moI (AAB) and -19.57 to -26.22 (MCB) in temperature range 303-338 K. (C) 2008 Elsevier B.V. All rights reserved.eninfo:eu-repo/semantics/closedAccessBentoniteAdsorptionThermodynamicManganese oxideLeadArticle1612-36776851850150710.1016/j.jhazmat.2008.04.0202-s2.0-56249131096Q1WOS:000262292400011Q1