The removal of reactive dyes using high-ash char

• Type: Article in International Scientific Journal
• Date: 2001

Authors

Moreira, RFPM (Author) Other; Soares, JL (Author) Other; Jose, HJ (Author) Other; Alírio Rodrigues (Author) FEUP

Journal

Title: Brazilian Journal of Chemical Engineering

Vol. 18

Pages: 327-336

ISSN: 0104-6632

Publisher: Brazilian Society of Chemical Engineering

Indexing

ISI Web of Knowledge - 8 Citations

Scopus - 8 Citations

Other information

Authenticus ID: 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 10