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Please use this identifier to cite or link to this item: http://hdl.handle.net/10198/2001

Título: Cadmium(II) and zinc(II) adsorption by the aquatic moss Fontinalis antipyretica: effect of temperature, pH and water hardness.
Autor: Martins, Ramiro
Pardo, Rosana
Boaventura, Rui
Palavras-chave: Aquatic moss
Zinc
Cadmium
Sorption
Heavy metals
Fontinalis antipyretica
Issue Date: 2004
Editora: Elsevier
Citação: Martins, Ramiro; Pardo, Rosana; Boaventura, Rui (2004) - Cadmium(II) and zinc(II) adsorption by the aquatic moss Fontinalis antipyretica: effect of temperature, pH and wat:er hardness. Water Research. ISSN 0043-1354. 38:3, p. 693-699
Resumo: The biosorption of cadmium(II) and zinc(II) ions onto dried Fontinalis antipyretica, a widely spread aquatic moss, was studied under different values of temperature, initial pH and water hardness. The equilibrium was well described by Langmuir adsorption isotherms. Maximum biosorption capacity of cadmium was independent on temperature and averaged 28.0mg g 1 moss, whereas for zinc, capacity increased with temperature, from 11.5mg g 1 moss at 5 C to 14.7mg g 1 moss at 30 C. Optimum adsorption pH value was determined as 5.0 for both metal ions. Cadmium uptake was unaffected by the presence of calcium ions, but zinc sorption was improved when water hardness increased from 101.1 to 116.3mg CaCO3 l 1. Inversely, as hardness increases, the competition with calcium ions strongly reduces the affinity of the biosorbent for zinc.
URI: http://hdl.handle.net/10198/2001
ISSN: 0043-1354
Versão do Editor: http://www.sciencedirect.com/science/journal/00431354
Appears in Collections:DTQB - Artigos em Revistas Indexados ao ISI

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