Adsorption of hevy metal ions at the Al2O3-SiO2/NaClO4 electrolyte interface
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Maria Curie Skłodowska University
Institute of Surface Chemistry, Kiev
Publication date: 2008-01-01
Physicochem. Probl. Miner. Process. 2008;42(1):153-164
The study on adsorption of heavy metals (Cd(II), Ni(II) and Pb(II)) at the Al2O3-SiO2/electrolyte solution interface is presented in this paper. The influence of ionic strength, pH, background electro- lyte (NaClO4) concentration and composition of metal oxide on adsorption of Cd(II), Ni(II) and Pb(II) from solution of initial concentration ranged from 1×10-6 to 1×10-3 mol/dm3 in the mentioned system was investigated. The adsorptions edge parameters (pH50% and ∆pH10-90%) for different con- centrations of electrolyte were presented. The adsorption measurements were complemented by the potentiometric titration of Al2O3-SiO2 suspensions and electrophoretic measurements. Charge rever- sal point (CR2) can be observed for solution concentration of 10-3 mol/dm3 as a result of Cd(II), Ni(II) and Pb(II) ions adsorption.
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