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

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 25ºC with regard to the influence of contact time, initial mercury concentration, solution pH, salinity and presence of sev...

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Detalles Bibliográficos
Autores: Herrero, Roberto, Lodeiro, Pablo, Vilariño, Teresa, Sastre de Vicente, Manuel E., Rey-Castro, Carlos
Tipo de recurso: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2005
País:España
Institución:Universitat de Lleida (UdL)
Repositorio:Repositori Obert UdL
OAI Identifier:oai:repositori.udl.cat:10459.1/58465
Acceso en línea:https://doi.org/10.1016/j.watres.2005.05.041
http://hdl.handle.net/10459.1/58465
Access Level:acceso abierto
Palabra clave:Cystoseira baccata
Mercury
Adsorption
Marine macroalga
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spelling Removal of inorganic mercury from aqueous solutions by biomass of the marine macroalga Cystoseira BaccataHerrero, RobertoLodeiro, PabloVilariño, TeresaSastre de Vicente, Manuel E.Rey-Castro, CarlosCystoseira baccataMercuryAdsorptionMarine macroalgaThe 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 25ºC with regard to the influence of contact time, initial mercury concentration, solution pH, salinity and presence of several divalent cations. The acidbase 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 (NaNO3, KNO3) 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 Ca2+, Mg2+, Zn2+, Cd2+, Pb2+ and Cu2+, 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) HgOHCl and Hg(OH)2, to the algal surface sites.This work was funded by the projects BQU2002-02133 (from the Ministerio de Ciencia y Tecnología of Spain) and PGDIT02TAM10302PR (from the Xunta de Galicia).Elsevier2005info:eu-repo/semantics/articleinfo:eu-repo/semantics/acceptedVersionhttps://doi.org/10.1016/j.watres.2005.05.041http://hdl.handle.net/10459.1/58465reponame:Repositori Obert UdL instname:Universitat de Lleida (UdL)InglésMICYT/PN2000-2003/BQU2002-02133Versió postprint del document publicat a https://doi.org/10.1016/j.watres.2005.05.041Water Research, 2005, vol. 39, núm. 14, p. 3199-3210cc-by-nc-nd, (c) Elsevier, 2005info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-nd/3.0/es/oai:repositori.udl.cat:10459.1/584652026-06-24T12:42:17Z
dc.title.none.fl_str_mv Removal of inorganic mercury from aqueous solutions by biomass of the marine macroalga Cystoseira Baccata
title Removal of inorganic mercury from aqueous solutions by biomass of the marine macroalga Cystoseira Baccata
spellingShingle Removal of inorganic mercury from aqueous solutions by biomass of the marine macroalga Cystoseira Baccata
Herrero, Roberto
Cystoseira baccata
Mercury
Adsorption
Marine macroalga
title_short Removal of inorganic mercury from aqueous solutions by biomass of the marine macroalga Cystoseira Baccata
title_full Removal of inorganic mercury from aqueous solutions by biomass of the marine macroalga Cystoseira Baccata
title_fullStr Removal of inorganic mercury from aqueous solutions by biomass of the marine macroalga Cystoseira Baccata
title_full_unstemmed Removal of inorganic mercury from aqueous solutions by biomass of the marine macroalga Cystoseira Baccata
title_sort Removal of inorganic mercury from aqueous solutions by biomass of the marine macroalga Cystoseira Baccata
dc.creator.none.fl_str_mv Herrero, Roberto
Lodeiro, Pablo
Vilariño, Teresa
Sastre de Vicente, Manuel E.
Rey-Castro, Carlos
author Herrero, Roberto
author_facet Herrero, Roberto
Lodeiro, Pablo
Vilariño, Teresa
Sastre de Vicente, Manuel E.
Rey-Castro, Carlos
author_role author
author2 Lodeiro, Pablo
Vilariño, Teresa
Sastre de Vicente, Manuel E.
Rey-Castro, Carlos
author2_role author
author
author
author
dc.subject.none.fl_str_mv Cystoseira baccata
Mercury
Adsorption
Marine macroalga
topic Cystoseira baccata
Mercury
Adsorption
Marine macroalga
description 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 25ºC with regard to the influence of contact time, initial mercury concentration, solution pH, salinity and presence of several divalent cations. The acidbase 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 (NaNO3, KNO3) 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 Ca2+, Mg2+, Zn2+, Cd2+, Pb2+ and Cu2+, 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) HgOHCl and Hg(OH)2, to the algal surface sites.
publishDate 2005
dc.date.none.fl_str_mv 2005
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv https://doi.org/10.1016/j.watres.2005.05.041
http://hdl.handle.net/10459.1/58465
url https://doi.org/10.1016/j.watres.2005.05.041
http://hdl.handle.net/10459.1/58465
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv MICYT/PN2000-2003/BQU2002-02133
Versió postprint del document publicat a https://doi.org/10.1016/j.watres.2005.05.041
Water Research, 2005, vol. 39, núm. 14, p. 3199-3210
dc.rights.none.fl_str_mv cc-by-nc-nd, (c) Elsevier, 2005
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
rights_invalid_str_mv cc-by-nc-nd, (c) Elsevier, 2005
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:Repositori Obert UdL
instname:Universitat de Lleida (UdL)
instname_str Universitat de Lleida (UdL)
reponame_str Repositori Obert UdL
collection Repositori Obert UdL
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15.812455

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