The adsorption of copper to chitin in seawater

The interaction of metal ions with particulate matter is important in limiting their concentration in seawater. Chitin is one of the constituents of the natural particulate organic matter than can interact with metal ions and therefore may serve as a reasonable model for natural organic solids. The...

ver descrição completa

Detalhes bibliográficos
Autores: Millero, Frank J., González-Dávila, Melchor
Formato: artículo
Fecha de publicación:1990
País:España
Repositorio:accedaCRIS portal de investigación de la Universidad de las Palmas de Gran Canaria
OAI Identifier:oai:accedacris.ulpgc.es:10553/1165
Acesso em linha:http://hdl.handle.net/10553/1165
Access Level:acceso abierto
Palavra-chave:Quitina
Cobre
Adsorción
id ES_14c8df5acbb4e5a899c30884a9684886
oai_identifier_str oai:accedacris.ulpgc.es:10553/1165
network_acronym_str ES
network_name_str España
repository_id_str
spelling The adsorption of copper to chitin in seawaterMillero, Frank J.González-Dávila, MelchorQuitinaCobreAdsorciónThe interaction of metal ions with particulate matter is important in limiting their concentration in seawater. Chitin is one of the constituents of the natural particulate organic matter than can interact with metal ions and therefore may serve as a reasonable model for natural organic solids. The adsorption of Cu2+ on the chitin surface has been studied in seawater as a function of pH, temperature, and salinity. The amphoteric properties of the surface of chitin were characterized in 0.7 M NaCl in terms of a two-protic acid-base system (pHPZC = 5.4) with acidity constants and . The maximum proton exchange capacity of chitin was found to be 2.3 ± 0.3 mol kg−1, broadly similar to other solids. The rates of the adsorption were quite rapid () and not strongly affected by the presence of other metals such as Cd2+ and Pb2+. The adsorption equilibrium data have been found to correlate well with surface complex-formation equilibria or the mathematically equivalent Langmuir- type adsorption equilibria. The value for the stability constant of Cu2+ on chitin was found to be , and the complexing capacity of chitin was found to be 6.9 and 5.9 μmol g−1, respectively, in the absence and in the presence of Cd2+ and Pb2+. An increase in the salinity and a decrease in the temperature result in greater adsorption of Cu2+ to chitinSCIEFacultad de Ciencias del MarDepartamento de QuímicaQUIMAQuímicaFacultad de Ciencias del Mar2009201820181990info:eu-repo/semantics/articleArticlehttp://hdl.handle.net/10553/1165Geochimica et Cosmochimica Acta [ISSN 0016-7037], v. 54, p. 761-768reponame:accedaCRIS portal de investigación de la Universidad de las Palmas de Gran Canariainstname:EspañolGeochimica et Cosmochimica Actainfo:eu-repo/semantics/openAccessoai:accedacris.ulpgc.es:10553/11652025-08-04T10:01:22Z
dc.title.none.fl_str_mv The adsorption of copper to chitin in seawater
title The adsorption of copper to chitin in seawater
spellingShingle The adsorption of copper to chitin in seawater
Millero, Frank J.
Quitina
Cobre
Adsorción
title_short The adsorption of copper to chitin in seawater
title_full The adsorption of copper to chitin in seawater
title_fullStr The adsorption of copper to chitin in seawater
title_full_unstemmed The adsorption of copper to chitin in seawater
title_sort The adsorption of copper to chitin in seawater
dc.creator.none.fl_str_mv Millero, Frank J.
González-Dávila, Melchor
author Millero, Frank J.
author_facet Millero, Frank J.
González-Dávila, Melchor
author_role author
author2 González-Dávila, Melchor
author2_role author
dc.contributor.none.fl_str_mv Facultad de Ciencias del Mar
Departamento de Química
QUIMA
Química
Facultad de Ciencias del Mar
dc.subject.none.fl_str_mv Quitina
Cobre
Adsorción
topic Quitina
Cobre
Adsorción
description The interaction of metal ions with particulate matter is important in limiting their concentration in seawater. Chitin is one of the constituents of the natural particulate organic matter than can interact with metal ions and therefore may serve as a reasonable model for natural organic solids. The adsorption of Cu2+ on the chitin surface has been studied in seawater as a function of pH, temperature, and salinity. The amphoteric properties of the surface of chitin were characterized in 0.7 M NaCl in terms of a two-protic acid-base system (pHPZC = 5.4) with acidity constants and . The maximum proton exchange capacity of chitin was found to be 2.3 ± 0.3 mol kg−1, broadly similar to other solids. The rates of the adsorption were quite rapid () and not strongly affected by the presence of other metals such as Cd2+ and Pb2+. The adsorption equilibrium data have been found to correlate well with surface complex-formation equilibria or the mathematically equivalent Langmuir- type adsorption equilibria. The value for the stability constant of Cu2+ on chitin was found to be , and the complexing capacity of chitin was found to be 6.9 and 5.9 μmol g−1, respectively, in the absence and in the presence of Cd2+ and Pb2+. An increase in the salinity and a decrease in the temperature result in greater adsorption of Cu2+ to chitin
publishDate 1990
dc.date.none.fl_str_mv 1990
2009
2018
2018
dc.type.none.fl_str_mv info:eu-repo/semantics/article
Article
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10553/1165
url http://hdl.handle.net/10553/1165
dc.language.none.fl_str_mv Español
language_invalid_str_mv Español
dc.relation.none.fl_str_mv Geochimica et Cosmochimica Acta
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.source.none.fl_str_mv Geochimica et Cosmochimica Acta [ISSN 0016-7037], v. 54, p. 761-768
reponame:accedaCRIS portal de investigación de la Universidad de las Palmas de Gran Canaria
instname:
instname_str
reponame_str accedaCRIS portal de investigación de la Universidad de las Palmas de Gran Canaria
collection accedaCRIS portal de investigación de la Universidad de las Palmas de Gran Canaria
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869403756320260096
score 15,301629

Registos relacionados