Removal of congo red using activated carbon and its regeneration

Activated carbon is used for the removal of colored toxic congo red dye. The effects of different operating conditions like, initial dye concentration, contact time, pH and temperature are studied for adsorption of congo red by a known amount of activated carbon (1.0 g/L) under stirred batch conditi...

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Bibliographic Details
Published in:Journal of hazardous materials 2007-06, Vol.145 (1), p.287-295
Main Authors: Purkait, M.K., Maiti, A., DasGupta, S., De, S.
Format: Article
Language:English
Subjects:
Adsorption
Adsorption isotherm
Anionic surfactant
Applied sciences
Cationic surfactant
Charcoal - chemistry
Chemical engineering
Congo red
Congo Red - analysis
Exact sciences and technology
Hydrogen-Ion Concentration
Industrial Waste - analysis
Kinetics
Models, Chemical
Molecular Structure
Pollution
Regeneration
Spent carbon
Surface Properties
Surface-Active Agents - chemistry
Temperature
Water Pollutants, Chemical - analysis
Water Purification - methods
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Summary:Activated carbon is used for the removal of colored toxic congo red dye. The effects of different operating conditions like, initial dye concentration, contact time, pH and temperature are studied for adsorption of congo red by a known amount of activated carbon (1.0 g/L) under stirred batch condition. The zero point of charge of the activated carbon is found about 6.6. About 90% dye is removed for initial concentration of 50 and 100 mg/L, it is about 80% at pH 7.0. Maximum adsorption (about 100%) of dye is observed at pH 2.0 for the concentration range studied here. Freundlich isotherm is found to fit the equilibrium data more adequately. Pseudo second order kinetic model explain successfully the kinetic data. The surfactant enhanced carbon regeneration (SECR) technique using both cationic and anionic surfactants is adopted for the regeneration of spent carbon by desorbing the dye. A kinetic model for dye desorption from the commercial activated carbon (CAC) is also proposed. Anionic surfactants show better performance than the cationic ones. Efficiency of dye desorption using surfactants is also compared with the desorption using pH change.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2006.11.021