Equilibrium and Kinetic Study of Congo Red Adsorption onto Lignin-Based Activated Carbons

The adsorption of Congo Red (CR) from aqueous solutions has been studied using various activated carbons prepared by us from eucalyptus kraft lignin. The adsorption isotherms were complex; nevertheless their data were fitted to the Langmuir and BET models. ΔG values suggested spontaneous nature of t...

Full description

Saved in:
Bibliographic Details
Published in:Transport in porous media 2010-07, Vol.83 (3), p.573-590
Main Authors: Cotoruelo, Luis M., Marqués, María D., Díaz, Francisco J., Rodríguez-Mirasol, José, Rodríguez, Juan J., Cordero, Tomás
Format: Article
Language:English
Subjects:
Activated carbon
Adsorption
Aqueous solutions
Civil Engineering
Classical and Continuum Physics
Diffusion rate
Earth and Environmental Science
Earth Sciences
Earth, ocean, space
Economics
Engineering and environment geology. Geothermics
Eucalyptus
Exact sciences and technology
Geotechnical Engineering & Applied Earth Sciences
Hydrocarbons
Hydrogeology
Hydrology. Hydrogeology
Hydrology/Water Resources
Industrial Chemistry/Chemical Engineering
Lignin
Mathematical models
Point charge
Pollution, environment geology
Porosity
Sedimentary rocks
Specific surface
Surface chemistry
Surface properties
Water purification
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The adsorption of Congo Red (CR) from aqueous solutions has been studied using various activated carbons prepared by us from eucalyptus kraft lignin. The adsorption isotherms were complex; nevertheless their data were fitted to the Langmuir and BET models. ΔG values suggested spontaneous nature of the adsorption processes. The high amounts adsorbed were studied as a function of the operating variables (pH, temperature) as well as the specific surface properties (zero-point charge, burn-off, and porosity) of the activated carbons. The diffusion coefficients have been estimated on the basis of an internal diffusion controlling mechanism for the net adsorption rate. Therefore, the obtained results in the present study should be of utility for the preparation of new adsorbents and they should make a contribution to design the adsorption equipment. Technical, economical, and environmental concerns have been considered in the purpose of the present study for water purification where that is polluted by anionic dyes.
ISSN:0169-3913
1573-1634
DOI:10.1007/s11242-009-9460-8