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Kinetic models for the adsorption of lead ions by steel slag

Chengdu University of Information Technology

^* To whom correspondence should be addressed. E-mail: lsy{at}cuit.edu.cn.

	Abstract

Batch experiments were carried out to investigate the kinetics of adsorption of lead ions by steel slag on the basis of the external diffusion, intraparticle diffusion and adsorption reaction model (pseudo-first-order, pseudo-second-order). The results showed that the controlling step for the adsorption kinetics changed with experimental parameters varied. When the particle size of steel slag was larger than 120 mesh, intraparticle diffusion of Pb²⁺ was the controlling step; when the initial concentration of Pb²⁺ was less than 150 mg L^–1 or the shaking rate was lower than 150 rpm, external diffusion of Pb²⁺ 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 Pb²⁺ with steel slag followed the Langmuir model, with a correlation coefficient of 0.99.

First published on October 6, 2009
Waste Management & Research 2009, doi:10.1177/0734242X09346976


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