Modeling of trivalent chromium speciation in binding sites of marine macroalgae Sargassum Cymosum

• Tipo: Artigo em Revista Científica Internacional
• Data: 2013

Autores

F. B. de Souza (Autor) FEUP; Vítor J. P. Vilar (Autor) FEUP; Carina A. E. Costa (Autor) FEUP; S. M. A. Guelli Ulson de Souza (Autor) Outra; A. A. Ulson de Souza (Autor) Outra; Cidália M. S. Botelho (Autor) FEUP; Rui A. R. Boaventura (Autor) FEUP

Revista

Título: Clean Technologies and Environmental Policy

Vol. 15 Nº 6

Páginas: 987-997

ISSN: 1618-954X

Editora: Springer Nature

Indexação

ISI Web of Knowledge - 3 Citações

ISI Web of Science

Scopus - 7 Citações

Classificação Científica

FOS: Ciências da engenharia e tecnologias > Engenharia do ambiente

CORDIS: Ciências Tecnológicas > Tecnologia > Tecnologia ambiental

Projetos Associados

LA 20 - Projeto Estratégico-LA 20 - 2011-2012

Outras Informações

ID Authenticus: P-006-JAB

DOI: 10.1007/s10098-012-0573-3

Abstract (EN): In this study, the marine macroalgae Sargassum cymosum was used for the purification of waters contaminated with trivalent chromium. FTIR analysis revealed a high heterogeneity of the biosorbent surface, as indicated by the different absorption peaks. Biomass titration revealed two main functional groups, carboxylic and hydroxyl. The pK(1,H) value and the number of carboxylic groups were estimated as 3.05 +/- A 0.01 and 1.90 +/- A 0.01 mmol g(-1), respectively. An equilibrium model considering the metal speciation in aqueous solution was able to predict the experimental data at different pH values. Adsorption of chromium increases significantly with an increase of the solution pH. Furthermore, the speciation of the binding sites as a function of the solution pH was predicted, showing that Cr(OH)(2+) has a higher affinity than Cr3+ to the binding sites. A mass transfer model considering an intraparticle diffusion resistance was able to predict the kinetic data, showing that Cr3+ diffuses faster that CrOH2+.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 11