The removal of reactive dyes using high-ash char

• Tipo: Artigo em Revista Científica Internacional
• Data: 2001

Autores

Moreira, RFPM (Autor) Outra; Soares, JL (Autor) Outra; Jose, HJ (Autor) Outra; Alírio Rodrigues (Autor) FEUP

Revista

Título: Brazilian Journal of Chemical Engineering

Vol. 18

Páginas: 327-336

ISSN: 0104-6632

Editora: Brazilian Society of Chemical Engineering

Indexação

ISI Web of Knowledge - 8 Citações

Scopus - 8 Citações

Outras Informações

ID Authenticus: P-000-TBK

Abstract (EN): The thermodynamics and kinetics of adsorption of reactive dyes on high-ash char was studied. Equilibrium data were obtained using the static method with controlled agitation at temperatures in the range of 30 to 60 degreesC. The Langrnuir isotherm model was used to describe the equilibrium of adsorption, and the equilibrium parameters, R-L, in the range of 0 to 1 indicate favorable adsorption. The amount of dye adsorbed increased as temperature increased from 30 to 40 degreesC, but above 40 degreesC the increase in temperature resulted in a decrease in the amount of dye adsorbed. The kinetic data presented are for controlled agitation at 50 rpm and constant temperature with dye concentrations in the range of 10 ppm to 50 ppm. The film mass transfer coefficient, K-f, and the effective diffusivity inside the particle, D-e, were fitted to the experimental data. The results indicate that internal diffusion governs the adsorption rate.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 10