title: Sorption and desorption of lead (II) from wastewater by green algae Cladophora fascicularis.
abstract: Biosorption is an effective method to remove heavy metals from wastewater. In this work, adsorption features of Cladophora fascicularis were investigated as a function of time, initial pH, initial Pb(II) concentrations, temperature and co-existing ions. Kinetics and equilibria were obtained from batch experiments. The biosorption kinetics followed the pseudo-second order model. Adsorption equilibria were well described by the Langmuir and Freundlich isotherm models. The maximum adsorption capacity was 198.5 mg/g at 298K and pH 5.0. The adsorption processes were endothermic and the biosorption heat was 29.6 kJ/mol. Desorption experiments indicated that 0.01 mol/L Na(2)EDTA was an efficient desorbent for the recovery of Pb(II) from biomass. IR spectrum analysis suggested amido or hydroxy, CO and C-O could combine intensively with Pb(II).
authors.affiliation: Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China.
authors.forename: Liping
authors.initials: L
authors.lastname: Deng
authors.forename: Yingying
authors.initials: Y
authors.lastname: Su
authors.forename: Hua
authors.initials: H
authors.lastname: Su
authors.forename: Xinting
authors.initials: X
authors.lastname: Wang
authors.forename: Xiaobin
authors.initials: X
authors.lastname: Zhu
mesh_terms: D000327:Adsorption; D000838:Anions / Q000737:chemistry; D002412:Cations / Q000737:chemistry; D000460:Chlorophyta / Q000737:chemistry*; D006358:Hot Temperature; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste; D007700:Kinetics; D007854:Lead / Q000737:chemistry*; D013055:Spectrophotometry, Infrared; D014865:Waste Disposal, Fluid / Q000379:methods*
chemical_list: D000838:Anions; D002412:Cations; D007220:Industrial Waste; D007854:Lead