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Removal of inorganic mercury from aqueous solutions by biomass of the marine macroalga Cystoseira baccata

Herrero, Roberto ; Lodeiro, Pablo ; Rey-Castro, Carlos ; Vilariño, Teresa ; Sastre de Vicente, Manuel E.

Water research (Oxford), 2005-09, Vol.39 (14), p.3199-3210 [Periódico revisado por pares]

Oxford: Elsevier Ltd

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Título:
Removal of inorganic mercury from aqueous solutions by biomass of the marine macroalga Cystoseira baccata
Autor: Herrero, Roberto ; Lodeiro, Pablo ; Rey-Castro, Carlos ; Vilariño, Teresa ; Sastre de Vicente, Manuel E.
Assuntos: Adsorption ; Applied sciences ; Biological and medical sciences ; Biomass ; Biotechnology ; Cations, Divalent ; Cystoseira baccata ; Environment and pollution ; Exact sciences and technology ; Fundamental and applied biological sciences. Psychology ; Hydrogen-Ion Concentration ; Industrial applications and implications. Economical aspects ; Kinetics ; Marine Biology ; Marine macroalga ; Mercuric Chloride - isolation & purification ; Mercury ; Mercury - isolation & purification ; Mercury Compounds - isolation & purification ; Metals - chemistry ; Metals - pharmacology ; Nitrates - chemistry ; Nitrates - pharmacology ; Other industrial wastes. Sewage sludge ; Phaeophyceae - metabolism ; Pollution ; Sodium Chloride - chemistry ; Sodium Chloride - pharmacology ; Wastes ; Water Purification - methods ; Water treatment and pollution
É parte de: Water research (Oxford), 2005-09, Vol.39 (14), p.3199-3210
Notas: ObjectType-Article-2
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Descrição: The ability of Cystoseira baccata algal biomass to remove Hg(II) from aqueous solutions is investigated. The mercury biosorption process is studied through batch experiments at 25 °C with regard to the influence of contact time, initial mercury concentration, solution pH, salinity and presence of several divalent cations. The acid–base properties of the alga are also studied, since they are related to the affinity for heavy metals. The studies of the pH effect on the metal uptake evidence a sharp increasing sorption up to a pH value around 7.0, which can be ascribed to changes both in the inorganic Hg(II) speciation and in the dissociation state of the acid algal sites. The sorption isotherms at constant pH show uptake values as high as 178 mg g −1 (at pH 4.5) and 329 mg g −1 (at pH 6.0). The studies of the salinity influence on the Hg(II) sorption capacity of the alga exhibit two opposite effects depending on the electrolyte added; an increase in concentration of nitrate salts (NaNO 3, KNO 3) slightly enhances the metal uptake, on the contrary, the addition of NaCl salt leads to a drop in the sorption. The addition of different divalent cations to the mercury solution, namely Ca 2+, Mg 2+, Zn 2+, Cd 2+, Pb 2+ and Cu 2+, reveals that their effect on the uptake process is negligible. Finally, the equilibrium sorption results are compared with predictions obtained from the application of a simple competitive chemical model, which involves a discrete proton binding constant and three additional constants for the binding of the main neutral inorganic Hg(II) complexes, Hg(Cl) 2, HgOHCl and Hg(OH) 2, to the algal surface sites.
Editor: Oxford: Elsevier Ltd
Idioma: Inglês

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Removal of inorganic mercury from aqueous solutions by biomass of the marine macroalga Cystoseira baccata

Herrero, Roberto ; Lodeiro, Pablo ; Rey-Castro, Carlos ; Vilariño, Teresa ; Sastre de Vicente, Manuel E.

Oxford: Elsevier Ltd

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