Interferences of Zn2+ and Pb2+ on Cd2+ biosorption onto algae Gelidium, algal waste and a composite material

• Tipo: Capítulo ou Parte de Livro
• Data: 2008

Autores

Vitor Vilar (Autor) FEUP; Cidália Botelho (Autor) FEUP; Rui Boaventura (Autor) FEUP

Livro

Título: Heavy Metal Pollution

Páginas: 303-316

Indexação

Scopus - 1 Citação

Outras Informações

ID Authenticus: P-008-Z3W

Abstract (EN): Biosorption of Pb(II), Cd(II) and Zn(II) from binary metal solutions onto algalderived biomass, was investigated in a batch system at pH 5.3 and 20°C. Discrete andcontinuous equilibrium models were able to predict equilibrium results at differentequilibrium concentrations and pH values. The following sequence was obtained for themaximum uptake capacity and equilibrium affinity constants of metal ions to the activesites: Pb(II) > Cd(II) > Zn(II). The "iso-concentrations" cuts from the three dimensionalsorption isotherms, show that the uptake capacity of Cd(II) and Zn(II) decreaseddrastically in the presence of Pb(II). On the other hand, for the Cd(II)/Zn(II) system itwas concluded that Zn(II) uptake capacity is more sensitive to the presence of Cd(II) thanthe opposite. From discrete model the Langmuir affinity parameter, KL, can bedetermined as a function of pH and co-cation concentration. The KL values for Cd(II) andZn(II) decreased drastically in the presence of Pb(II), showing a higher affinity of thebinding sites to Pb(II).

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 13