title: Metal biosorption onto dry biomass of Arthrospira (Spirulina) platensis and Chlorella vulgaris: multi-metal systems.
abstract: Binary and ternary systems of Ni(2+), Zn(2+), and Pb(2+) were investigated at initial metal concentrations of 0.5, 1.0 and 2.0mM as competitive adsorbates using Arthrospira platensis and Chlorella vulgaris as biosorbents. The experimental results were evaluated in terms of equilibrium sorption capacity and metal removal efficiency and fitted to the multi-component Langmuir and Freundlich isotherms. The pseudo second order model of Ho and McKay described well the adsorption kinetics, and the FT-IR spectroscopy confirmed metal binding to both biomasses. Ni(2+) and Zn(2+) interference on Pb(2+) sorption was lower than the contrary, likely due to biosorbent preference to Pb. In general, the higher the total initial metal concentration, the lower the adsorption capacity. The results of this study demonstrated that dry biomass of C. vulgaris behaved as better biosorbent than A. platensis and suggest its use as an effective alternative sorbent for metal removal from wastewater.
authors.affiliation: Department of Biochemical and Pharmaceutical Technology, Faculty of Pharmaceutical Sciences, University of São Paulo, São Paulo, SP, Brazil.
authors.forename: Mayla Santos
authors.initials: MS
authors.lastname: Rodrigues
authors.forename: Lívia Seno
authors.initials: LS
authors.lastname: Ferreira
authors.forename: João Carlos Monteiro
authors.initials: JC
authors.lastname: de Carvalho
authors.forename: Alessandra
authors.initials: A
authors.lastname: Lodi
authors.forename: Elisabetta
authors.initials: E
authors.lastname: Finocchio
authors.forename: Attilio
authors.initials: A
authors.lastname: Converti
mesh_terms: D000327:Adsorption; D018533:Biomass; D048408:Chlorella vulgaris / Q000378:metabolism*; D007700:Kinetics; D008670:Metals / Q000378:metabolism*; D017550:Spectroscopy, Fourier Transform Infrared; D053545:Spirulina / Q000378:metabolism*; D013816:Thermodynamics
chemical_list: D008670:Metals