水中 特定 이온의 吸着 特性에 따른 粒子의 電氣的 擧動 變化 樣相
Variation of Electrical Behavior of Particles in Aqueous Environment Depending Upon the Adsorption Characteristics of Specific Ions
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초록
수중에 존재하는 입자의 표면에 대한 특정 이온의 흡착특성을 흡착에 따른 입자의 PZC 와 IEP 의 변화에 근거하여 해석 가능한 것으로 검토되었다. Cu2+ 와 같이 Chalcopyrite 입자표면에 Specific Adsorption 을 형성하는 이온이 수중에 존재하는 경우 입자의 PZC 는 낮아지는 것으로 관찰되었으며 이는 양이온의 흡착이 OH- 이온의 흡착을 초래하여 새로운 PZC 를 형성하기 위해 수중 H+ 농도의 상승이 요구됨으로 인한 결과로 파악되었다. 그러나, 이와는 반대로 IEP 는 높아지는 현상이 나타난 바, 이는 양이온의 흡착으로 인해 입자의 Surface Potential 이 양의 방향으로 상승하여 이를 상쇄하기 위한 pH 의 증가가 원인인 것으로 고찰되었다. Non-specific Adsorption 의 경우 입자표면의 Surface Potential 의 변화가 초래되지 않음으로 인해 입자의 PZC 및 IEP 는 변화하지 않는 것으로 파악되었다.
Abstract
It was possible to understand the adsorption characteristics of ions in aqueous environment based on the variations of PZCand IEP of particles when adsorption of ions on particle surface occurred. The specific adsorption of Cu2+ ion upon chalcopyritetion between the two ions. On the contrary, IEP of chalcopyrite was observed to rise when Cu2+ was specifically adsorbed onits surface. The reason for this could be explained by the necessity of the increase of pH to offset the positively increased surfacepotential 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.
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