Cadmium(II) and zinc(II) adsorption by the aquatic moss Fontinalis antipyretica: effect of temperature, pH and water hardness

• Tipo: Artigo em Revista Científica Internacional
• Data: 2004

Autores

Ramiro Martins (Autor) FEUP; Rosana Pardo Moro (Autor) FEUP; Rui A. R. Boaventura (Autor) FEUP

Revista

Título: Water Research

Vol. 38 Nº 3

Páginas: 693-699

ISSN: 0043-1354

Editora: Elsevier

Indexação

ISI Web of Knowledge - 138 Citações

Scopus - 159 Citações

Classificação Científica

FOS: Ciências da engenharia e tecnologias > Outras ciências da engenharia e tecnologias

Outras Informações

ID Authenticus: P-000-BX7

DOI: 10.1016/j.watres.2003.10.013

Abstract (EN): 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 28.0 mg g(-1) moss, whereas for zinc, capacity increased with temperature, from 11.5 mg g(-1) moss at 5degreesC to 14.7 mg g(-1) moss at 30degreesC. 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 116.3 mg CaCO3 l(-1). Inversely, as hardness increases, the competition with calcium ions strongly reduces the affinity of the biosorbent for zinc.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 7