科研之友
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摘要
The removal of lead from aqueous solutions on fossilized wood, Oltu stone, was explored and interpreted by both adsorption and kinetic mechanisms. Batch experiments were conducted to investigate the adsorption effect under various pH (3, 4, 6, and 7), temperatures (290, 298, 303, and 313 K) and the ratios of amounts of lead ions adsorbent (5.5, 8.3, 16.6, and 25 mg/g). The experimental data were analyzed based on the Freundlich, Langmuir and Dubinin-Radushkevich isotherm models. The batch adsorption was tested in terms of the pseudo-first order, pseudo second order and intraparticle diffusion kinetic reaction models. The equilibrium and kinetics data were used to evaluate the thermodynamics parameters. The thermodynamics studies revealed that adsorption of Pb(II) ions was endothermic. It followed the Freundlich model with the pseudo second order kinetics.
- 出版日期2010
