Open AccessAggregation mechanism of colloidal kaolinite in aqueous solutions with electrolyte and surfactants
Author(s) -
Yang Hu,
Qingyang Yang,
Jue Kou,
Chunbao Sun,
Hongliang Li
Publication year - 2020
Publication title -
plos one
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.99
H-Index - 332
ISSN - 1932-6203
DOI - 10.1371/journal.pone.0238350
Subject(s) - kaolinite , zeta potential , pulmonary surfactant , adsorption , flocculation , chemical engineering , surface charge , electrolyte , aqueous solution , suspension (topology) , materials science , colloid , chemistry , nanoparticle , mineralogy , organic chemistry , mathematics , electrode , homotopy , pure mathematics , engineering
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.