Determining pseudo-equilibrium of montmorillonite colloids in generation and sedimentation experiments as a function of ionic strength, cationic form, and elevation
2009 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 335, no 1, 54-61 p.Article in journal (Refereed) Published
Colloid generation and sedimentation experiments were carried out on Na- and Ca-montmorillonite in order to verify whether pseudo-equilibrium concentrations are reached at the same level in both types of experiments. The size and concentration of colloidal Na- and Ca-montmorillonite particles were monitored as a function of time and distance from the colloid bed in different ionic strength solutions. A stable pseudo-equilibrium concentration was reached after time in generation and sedimentation experiments. The colloid concentration decreased sharply at distances near to the colloid source. Na-montmorillonite concentration at pseudo-equilibrium (roughly quantified at distances ≥7 cm from the colloid source) was 5.2 ± 0.5, 0.5 ± 0.1, and 0.2 ± 0.1 mg L-1 in 0.001, 0.01, and 0.1 M NaCl solution, respectively, while the Ca-montmorillonite concentration was 0.4 ± 0.2 mg L-1 in 0.001 M NaCl.
Place, publisher, year, edition, pages
2009. Vol. 335, no 1, 54-61 p.
Ca-montmorillonite, Colloids, Generation, Na-montmorillonite, Sedimentation, Size distribution
IdentifiersURN: urn:nbn:se:kth:diva-11850DOI: 10.1016/j.jcis.2009.02.048ISI: 000266615400009ScopusID: 2-s2.0-65549100552OAI: oai:DiVA.org:kth-11850DiVA: diva2:285478
QC 201009082010-01-122010-01-122010-09-08Bibliographically approved