title: Heavy metal adsorption by crude coniferous barks: a modelling study.
abstract: Equilibria and mechanisms involved in the adsorption process of metal ions (Cr3+, Cu2+, Ni2+, Pb2+ and Zn2+) from aqueous solutions using coniferous barks as biosorbent substrate were investigated. Crude barks were used in this study since previous experiments showed a decreasing uptake for chemically treated barks in the considered granulometry. In our experimental conditions, the maximum binding capacity of barks followed the decreasing order Cr3+ > Cu2+ > Pb2+ > Ni2+ > Zn2+ whereas their general binding affinity decreased as: Pb2+ > Cr3+ > Ni2+ > Zn2+ > Cu2+. Adsorption isotherms at the optimal physicochemical conditions were established and the adsorption phenomenon was described by the non-competitive Langmuir adsorption model which fitted well the experimental data. An evaluation of adsorption capability was carried out using model parameters which were graphically determined. Models for removal of cations have been discussed; they represent efficient tools for predicting the behaviour of the biosorbents in metal ion adsorption systems.
authors.affiliation: Laboratoire de Chimie des Substances Naturelles, Université de Limoges, Faculté des Sciences, France.
authors.forename: Fabienne
authors.initials: F
authors.lastname: Martin-Dupont
authors.forename: Vincent
authors.initials: V
authors.lastname: Gloaguen
authors.forename: Robert
authors.initials: R
authors.lastname: Granet
authors.forename: Michel
authors.initials: M
authors.lastname: Guilloton
authors.forename: Henri
authors.initials: H
authors.lastname: Morvan
authors.forename: Pierre
authors.initials: P
authors.lastname: Krausz
mesh_terms: D000327:Adsorption; D004785:Environmental Pollutants / Q000493:pharmacokinetics*; D005544:Forecasting; D019216:Metals, Heavy / Q000493:pharmacokinetics*; D008962:Models, Theoretical; D024301:Plant Bark / Q000737:chemistry; D064028:Tracheophyta
chemical_list: D004785:Environmental Pollutants; D019216:Metals, Heavy