Flocculation of aqueous silica suspensions using cationic polyelectrolytes
作者： A. Bleier , E.D. Goddard
DOI: 10.1016/0166-6622(80)80026-6
关键词: Flocculation 、 Chemical engineering 、 Charge density 、 Particle 、 Particle aggregation 、 Surface charge 、 Polymer chemistry 、 Adsorption 、 Polymer 、 Chemistry 、 Aqueous solution
摘要: Abstract Flocculation of model silica suspensions by cationic polyelectrolytes was studied using optical and microelectrophoretic techniques. Polymer charge density effects were determined varying the degree quaternization or changing pH, depending on nature amine group present. Charge neutralization appears to be principal flocculation mechanism, although polymer bridging may play a role once particle surface is significantly reduced. Silica retains net negative ζ-potential (−25 ± 5 mV) under optimal conditions. This finding discussed semi-quantitatively in terms an “electrostatic patch” adsorption for flocculation.
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