title: Biosorption of cadmium(II), zinc(II) and lead(II) by Penicillium simplicissimum: Isotherms, kinetics and thermodynamics.
abstract: The isotherms, kinetics and thermodynamics of Cd(II), Zn(II) and Pb(II) biosorption by Penicillium simplicissimum were investigated in a batch system. The effects of pH, initial metal ions concentration, biomass dose, contact time, temperature and co-ions on the biosorption were studied. Adsorption data were well described by both the Redlich-Peterson and Langmuir model. Chemical ion-exchange was found to be an important process based on free energy value from Dubini-Radushkevich isotherm for all metal ions. The results of the kinetic studies of all metal ions at different temperature showed that the rate of adsorption followed the pseudo second-order kinetics well. The thermodynamics constants DeltaG degrees , DeltaH degrees and DeltaS degrees of the adsorption process showed that biosorption of Cd(II), Zn(II) and Pb(II) ions on Penicillium simplicissimum were endothermic and spontaneous.
authors.affiliation: College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China.
authors.forename: Ting
authors.initials: T
authors.lastname: Fan
authors.forename: Yunguo
authors.initials: Y
authors.lastname: Liu
authors.forename: Baoying
authors.initials: B
authors.lastname: Feng
authors.forename: Guangming
authors.initials: G
authors.lastname: Zeng
authors.forename: Chunping
authors.initials: C
authors.lastname: Yang
authors.forename: Ming
authors.initials: M
authors.lastname: Zhou
authors.forename: Haizhou
authors.initials: H
authors.lastname: Zhou
authors.forename: Zhenfeng
authors.initials: Z
authors.lastname: Tan
authors.forename: Xin
authors.initials: X
authors.lastname: Wang
mesh_terms: D000327:Adsorption; D018533:Biomass; D002104:Cadmium / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D007854:Lead / Q000737:chemistry*; D015233:Models, Statistical; D010407:Penicillium / Q000737:chemistry* / Q000254:growth & development; D013696:Temperature; D013816:Thermodynamics; D015032:Zinc / Q000737:chemistry*
chemical_list: D002104:Cadmium; D007854:Lead; D015032:Zinc