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Variation of Electrical Behavior of Particles in Aqueous Environment Depending Upon the Adsorption Characteristics of Specific Ions  

Kim Dong-Su (Department of Environmental Science and Engineering, Ewha Womans University)
Publication Information
Resources Recycling / v.14, no.6, 2005 , pp. 60-63 More about this Journal
Abstract
It was possible to understand the adsorption characteristics of ions in aqueous environment based on the variations of PZC and IEP of particles when adsorption of ions on particle surface occurred. The specific adsorption of $Cu^{2+}$ ion upon chalcopyrite surface provoked a lowered PZC, which was considered to be due to increased adsorption of OH- ion via the electrostatic attraction between the two ions. On the contrary, IEP of chalcopyrite was observed to rise when Cu2+ was specifically adsorbed on its surface. The reason for this could be explained by the necessity of the increase of pH to offset the positively increased surface potential of chalcopyrite for the reestablishment of IEP. Neither PZC or IEP of chalcopyrite was observed to change when non-specific adsorption occurred since no change in the surface potential of chalcopyrite was invoked under this condition.
Keywords
Ion; Adsorption; Particle; PZC; IEP;
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