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

• Type: Article in International Scientific Journal
• Date: 2013

Authors

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

Journal

Title: Clean Technologies and Environmental Policy

Vol. 15 No. 6

Pages: 987-997

ISSN: 1618-954X

Publisher: Springer Nature

Indexing

ISI Web of Knowledge - 3 Citations

ISI Web of Science

Scopus - 7 Citations

Scientific classification

FOS: Engineering and technology > Environmental engineering

CORDIS: Technological sciences > Technology > Environmental technology

Associated Projects

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

Other information

Authenticus ID: 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+.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 11