Colloid Deposition Kinetics with Surface-Active Agents: Evidence for Discrete Surface Charge Effects

• Published in: Journal of colloid and interface science Vol. 165; no. 2; pp. 522 - 525
• Main Authors: Litton, Gary M., Olson, Terese M.
• Format: Journal Article
• Language: English
• Published: San Diego, CA Elsevier Inc 01.07.1994; Elsevier
• Subjects: 540210 - Environment, Terrestrial- Basic Studies- (1990-); ADSORPTION; Chemistry; Colloidal state and disperse state; ELASTOMERS; ENVIRONMENTAL SCIENCES; ENVIRONMENTAL TRANSPORT; Exact sciences and technology; General and physical chemistry; LATEX; MASS TRANSFER; MINERALS; ORGANIC COMPOUNDS; ORGANIC POLYMERS; OXIDE MINERALS; Physical and chemical studies. Granulometry. Electrokinetic phenomena; POLLUTANTS; POLYMERS; QUARTZ; RUBBERS; SORPTION; SORPTIVE PROPERTIES; Surface physical chemistry; SURFACE PROPERTIES; Surface-active agents: properties; SURFACTANTS; Inorganic adsorbate; Characterization; Anionic surfactant; Sodium compound; Experimental study; Quartz; Colloid particle
• ISSN: 0021-9797; 1095-7103
• DOI: 10.1006/jcis.1994.1258

Latex particle deposition kinetics in granular quartz beds were compared with and without surface-active agents to evaluate the effects of surface heterogeneities. Hydrophobic regions or metal oxide impurities were masked with sodium dodecyl sulfate (SDS) or phosphate, respectively. Deposition rates exhibited a remarkable ionic strength sensitivity in the presence of 10 -3 M SDS that was similar to unfavorable filtration predictions using DI,VO theory. The strong influence of SDS on particle deposition rates indirectly suggests that particle attachment is enhanced by uncharged, hydrophobic regions of the latex or quartz. Phosphate had little effect on either electrophoretic mobilities or particle deposition rates.