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 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.
Liu
Sheng-Yu
SY
College of Resources and Environment Engineering, Chengdu University of Information Technology, Chengdu 610225, China. lsy@cuit.edu.cn
Gao
Jin
J
Yang
Yi-Jin
YJ
Yang
Ying-Chun
YC
Ye
Zhi-Xiang
ZX
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
D007220:Industrial Waste; D013232:Steel; D007854:Lead