Thermodynamics of Pb2+ and Ni2+ adsorption onto natural bentonite from aqueous solutions.
Removal of Pb2+ and Ni2+ from aqueous solutions by sorption onto natural bentonite was investigated. Experiments were carried out as a function of particle size, the amount of bentonite, pH, concentration of metals, contact time, and temperature. The adsorption patterns of metal ions onto followed the Langmuir, Freundlich, and Dubinin-Radushkevich isotherms. This included adsorption isotherms of single-metal solutions at 303 K by batch experiments. The thermodynamic parameters (DeltaH,DeltaS,DeltaG) for Pb2+ and Ni2+ sorption onto bentonite were also determined from the temperature dependence. The adsorptions were endothermic reactions. The results suggested that natural bentonite is suitable as a sorbent material for recovery and adsorption of metal ions from aqueous solutions.
Donat
R
R
Department of Chemistry, Faculty of Science and Arts, Pamukkale University, 20017 Denizli, Turkey. rdonat@pamukkale.edu.tr
Akdogan
A
A
Erdem
E
E
Cetisli
H
H
D000327:Adsorption; D001546:Bentonite / Q000737:chemistry*; D001667:Binding, Competitive; D006863:Hydrogen-Ion Concentration; D007854:Lead / Q000737:chemistry*; D009532:Nickel / Q000737:chemistry*; D010316:Particle Size; D012996:Solutions / Q000737:chemistry; D013816:Thermodynamics; D014867:Water / Q000737:chemistry
D012996:Solutions; D014867:Water; D001546:Bentonite; D007854:Lead; D009532:Nickel