title: Removal of Pb(II) ions from aqueous solution by a waste mud from copper mine industry: equilibrium, kinetic and thermodynamic study.
abstract: The objective of this study was to assess the adsorption potential of a waste mud (WM) for the removal of lead (Pb(II)) ions from aqueous solutions. The WM was activated with NaOH in order to increase its adsorption capacity. Adsorption studies were conducted in a batch system as a function of solution pH, contact time, initial Pb(II) concentration, activated-waste mud (a-WM) concentration, temperature, etc. Optimum pH was specified as 4.0. The adsorption kinetic studies indicated that the overall adsorption process was best described by pseudo-second-order kinetics. The equilibrium adsorption capacity of a-WM was obtained by using Langmuir and Freundlich isotherm models and both models fitted well. Adsorption capacity for Pb(II) was found to be 24.4 mg g(-1) for 10 g L(-1) of a-WM concentration. Thermodynamic parameters including the Gibbs free energy (Delta G degrees), enthalpy (Delta H degrees), and entropy (DeltaS degrees) indicated that the adsorption of Pb(II) ions on the a-WM was feasible, spontaneous and endothermic, at temperature range of 0-40 degrees C. Desorption studies were carried out successfully with diluted HCl solutions. The results indicate that a-WM can be used as an effective and no-cost adsorbent for the treatment of industrial wastewaters contaminated with Pb(II) ions.
authors.affiliation: Department of Chemistry, Karadeniz Technical University, Faculty of Arts & Sciences, 61080 Trabzon, Turkey.
authors.forename: Duygu
authors.initials: D
authors.lastname: Ozdes
authors.forename: Ali
authors.initials: A
authors.lastname: Gundogdu
authors.forename: Baris
authors.initials: B
authors.lastname: Kemer
authors.forename: Celal
authors.initials: C
authors.lastname: Duran
authors.forename: Hasan Basri
authors.initials: HB
authors.lastname: Senturk
authors.forename: Mustafa
authors.initials: M
authors.lastname: Soylak
mesh_terms: D000327:Adsorption; D003300:Copper; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste / Q000517:prevention & control*; D007477:Ions; D007700:Kinetics; D007854:Lead / Q000302:isolation & purification*; D008906:Mining; D012972:Sodium Hydroxide; D012996:Solutions; D013696:Temperature; D013816:Thermodynamics; D014865:Waste Disposal, Fluid / Q000379:methods; D014874:Water Pollutants, Chemical / Q000302:isolation & purification
chemical_list: D007220:Industrial Waste; D007477:Ions; D012996:Solutions; D014874:Water Pollutants, Chemical; D007854:Lead; D012972:Sodium Hydroxide; D003300:Copper