Abstract
In this study, the effect of surfactants and electrolytes on stability of kaolinite dispersions was analyzed by measuring suspension transmittance, zeta potential, and adsorption. It was experimentally found that the compression of kaolinite electric double layer caused by NaCl addition may reduce the electrostatic repulse force to facilitate the aggregation of kaolinite particles. Surfactant facilitate the aggregation of kaolinite particles mainly through the adsorption of it on the surface of kaolinite to generate hydrophobic force. Compared to anionic surfactant, the cationic surfactant has a better flocculation effect because it can be used in a wide pH range and its adsorption can reduce the electrostatic repulse force between kaolinite particles.
Highlights
The layered structure of kaolinite is composed of a layered silicon–oxygen tetrahedron and a layered aluminum–oxygen octahedron [1, 2]
The strong hydration repulsion force derived from the thick hydrated film around the hydrophilic surface of kaolinite may weaken the flocculation effect of the electrolyte and polymer flocculation methods. Surfactants such as sodium dodecyl sulfate and sodium dodecyl benzenesulfonate are a better choice because they aggregate kaolinite particles by generating a strong hydrophobic attractive force between them, which is be affected by pH, and the hydration shell may break due to the hydrophobization of the particles [17,18,19,20]
To obtain the zeta potential of kaolinite particles, a certain amount of surfactant or NaCl was added in 250 mL 2 wt.% kaolinite suspension and the suspension was stirred at 300 rev/min for 15 min
Summary
The layered structure of kaolinite is composed of a layered silicon–oxygen tetrahedron and a layered aluminum–oxygen octahedron [1, 2]. The strong hydration repulsion force derived from the thick hydrated film around the hydrophilic surface of kaolinite may weaken the flocculation effect of the electrolyte and polymer flocculation methods. In this case, surfactants such as sodium dodecyl sulfate and sodium dodecyl benzenesulfonate are a better choice because they aggregate kaolinite particles by generating a strong hydrophobic attractive force between them, which is be affected by pH, and the hydration shell may break due to the hydrophobization of the particles [17,18,19,20]. The objective was to learn more about the agglomeration mechanism of colloidal kaolinite induced by electrolyte and surfactant
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