title: Adsorption intrinsic kinetics and isotherms of lead ions on steel slag.
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, 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 m gL(-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.
authors.affiliation: College of Resources and Environment Engineering, Chengdu University of Information Technology, Chengdu 610225, China. lsy@cuit.edu.cn
authors.forename: Sheng-Yu
authors.initials: SY
authors.lastname: Liu
authors.forename: Jin
authors.initials: J
authors.lastname: Gao
authors.forename: Yi-Jin
authors.initials: YJ
authors.lastname: Yang
authors.forename: Ying-Chun
authors.initials: YC
authors.lastname: Yang
authors.forename: Zhi-Xiang
authors.initials: ZX
authors.lastname: Ye
mesh_terms: D000327:Adsorption; D000465:Algorithms; D004058:Diffusion; D007220:Industrial Waste / Q000032:analysis*; D007700:Kinetics; D007854:Lead / Q000737:chemistry*; D015233:Models, Statistical; D010316:Particle Size; D013232:Steel / Q000737:chemistry*; D013816:Thermodynamics
chemical_list: D007220:Industrial Waste; D013232:Steel; D007854:Lead