Waste metal hydroxide sludge as adsorbent for a reactive dye

• Tipo: Artigo em Revista Científica Internacional
• Data: 2008

Autores

Sílvia C. R. Santos (Autor) FEUP; Vítor J. P. Vilar (Autor) FEUP; Rui A. R. Boaventura (Autor) FEUP

Revista

Título: Journal of Hazardous Materials

Vol. 153 Nº 3

Páginas: 999-1008

ISSN: 0304-3894

Editora: Elsevier

Indexação

ISI Web of Knowledge - 90 Citações

ISI Web of Science

Scopus - 104 Citações

COMPENDEX

Classificação Científica

FOS: Ciências da engenharia e tecnologias > Engenharia do ambiente

Outras Informações

ID Authenticus: P-003-ZB2

DOI: 10.1016/j.jhazmat.2007.09.050

Abstract (EN): An industrial waste sludge mainly composed by metal hydroxides was used as a low-cost adsorbent for removing a reactive textile dye (Remazol Brilliant Blue) in solution. Characterization of this waste material included chemical composition, pH(ZPC) determination, particle size distribution, physical textural properties and metals mobility under different pH conditions. Dye adsorption equilibrium isotherms were determined at 25 and 35 degrees C and pH of 4, 7 and 10 revealing reasonably fits to Langmuir and Freundlich models. At 25 degrees C and pH 7, Langmuir fit indicates a maximum adsorption capacity of 91.0 mg/g. An adsorptive ion-exchange mechanism was identified from desorption studies. Batch kinetic experiments were also conducted at different initial dye concentration, temperature, adsorbent dosage and pH. A pseudo-second-order model showed good agreement with experimental data. LDF approximation model was used to estimate homogeneous solid diffusion coefficients and the effective pore diffusivities. Additionally, a simulated real effluent containing the selected dye, salts and dyeing auxiliary chemicals, was also used in equilibrium and kinetic experiments and the adsorption performance was compared with aqueous dye solutions.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 10