Adsorption intrinsic kinetics and isotherms of lead ions on steel slag

Batch experiments were carried out to investigate the kinetics of adsorption of lead ions by steel slag on the basis of the external diffusion, intra-particle diffusion and adsorption reaction model (pseudo-first-order, pseudo-second-order). The results showed that the controlling step for the adsor...

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Bibliographic Details
Published in:Journal of hazardous materials 2010-01, Vol.173 (1), p.558-562
Main Authors: Liu, Sheng-Yu, Gao, Jin, Yang, Yi-Jin, Yang, Ying-Chun, Ye, Zhi-Xiang
Format: Article
Language:English
Subjects:
Adsorption
Algorithms
Applied sciences
Chemical engineering
Diffusion
Diffusion rate
Exact sciences and technology
Heavy metal
Industrial Waste - analysis
Iron and steel making
Isotherms
Kinetics
Lead - chemistry
Models, Statistical
Other industrial wastes. Sewage sludge
Particle Size
Pollution
Reaction kinetics
Slags
Steel - chemistry
Steel slag
Steels
Thermodynamics
Wastes
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Summary:Batch experiments were carried out to investigate the kinetics of adsorption of lead ions by steel slag on the basis of the external diffusion, intra-particle diffusion and adsorption reaction model (pseudo-first-order, pseudo-second-order). The results showed that the controlling step for the adsorption kinetics changed with the varying experimental parameters. When the particle size of steel slag was larger than 120 mesh, intra-particle diffusion of Pb 2+ was the controlling step, and when the initial concentration of Pb 2+ was less than 150 mg L −1 or the shaking rate was lower than 150 rpm, external diffusion of Pb 2+ was promoted. Contrary to the former experimental conditions the adsorption reaction was the controlling step, and the adsorption followed second-order kinetics, with an adsorption rate constant of 13.26 g mg −1 min −1. The adsorption isotherm of Pb 2+ with steel slag followed the Langmuir model, with a correlation coefficient of 0.99.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2009.08.122