title: Biosorption of nickel(II) from aqueous solution by brown algae: equilibrium, dynamic and thermodynamic studies.
abstract: The biosorption characteristics of nickel(II) ions using the brown algae (Cystoseria indica, Nizmuddinia zanardini, Sargassum glaucescens and Padina australis) were investigated. Experimental parameters affecting the biosorption process such as pH level, contact time, initial metal concentration and temperature were studied. The equilibrium data fitted very well to the Langmuir adsorption model in the concentration range of nickel(II) ions and at all the temperatures studied. Evaluation of the experimental data in terms of biosorption dynamics showed that the biosorption of nickel(II) onto algal biomass followed the pseudo-second-order dynamics well. The calculated thermodynamic parameters (Delta G degrees, Delta H degrees and DeltaS degrees) showed that the biosorption of nickel(II) ions were feasible, spontaneous and endothermic at the temperature ranges of 293-313 K.
authors.affiliation: Department of Chemical Engineering, Faculty of Engineering, Tarbiat Modares University, P.O. Box 14115-111, Tehran, Iran. pahlavzh@modares.ac.ir
authors.forename: H
authors.initials: H
authors.lastname: Pahlavanzadeh
authors.forename: A R
authors.initials: AR
authors.lastname: Keshtkar
authors.forename: J
authors.initials: J
authors.lastname: Safdari
authors.forename: Z
authors.initials: Z
authors.lastname: Abadi
mesh_terms: D000327:Adsorption; D001673:Biodegradation, Environmental; D018533:Biomass; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008962:Models, Theoretical; D009532:Nickel / Q000737:chemistry*; D000459:Phaeophyceae / Q000378:metabolism*; D012996:Solutions; D013696:Temperature; D013816:Thermodynamics; D013997:Time Factors; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*
chemical_list: D012996:Solutions; D014874:Water Pollutants, Chemical; D009532:Nickel