dc.creatorBorgnino Bianchi, Laura Carolina
dc.date.accessioned2015-10-01T18:53:54Z
dc.date.accessioned2018-11-06T11:54:58Z
dc.date.available2015-10-01T18:53:54Z
dc.date.available2018-11-06T11:54:58Z
dc.date.created2015-10-01T18:53:54Z
dc.date.issued2013-04-20
dc.identifierBorgnino Bianchi, Laura Carolina; Experimental determination of the colloidal stability of Fe(III)-montmorillonite: effects of organic matter, ionic strength and pH conditions; Elsevier; Colloids and Surfaces A: Physicochemical and Engineering Aspects; 423; 20-4-2013; 178-187
dc.identifier0927-7757
dc.identifierhttp://hdl.handle.net/11336/2267
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1861003
dc.description.abstractAggregation and disaggregation of particle colloids are one of the most important surface-driven phenomena encountered in the aquatic and terrestrial environments and a key factor controlling a number of important environmental processes. This study investigates the effects of pH, ionic strength, and humic acid concentration on the stability behavior of Fe(III)-montmorillonite, a natural colloid commonly presentin natural waters. Time-resolved dynamic light scattering was used to monitor the increase ofthe aggregate size over time in the aggregation kinetics experiments. Aggregation rate, stability ratio, and CCC (critical coagulation concentration) were calculated to quantify the experimental results, and the DLVO theory was employed to explain the observed behaviors. The effect of humic acid on the colloidal electrosteric stability was also investigated. This study demonstrates that low pH and high ionic strength may destabilize Fe(III)-montmorillonite suspensions, while increasing humic acid concentrations has the opposite effect, stabilizing the suspension at any pH. Comparing the steric and electrostatic effects on the Fe-M stabilization, both have an important influence for all pH levels studied, although steric is more pronounced at low pH and high ionic strength. DLVO energy predictions support the experimental results. The obtained results contribute to the understanding of the behavior of colloidal particles in saline or freshwater natural environments as well as the role of humic acid in themobility of contaminants associated with natural colloids.
dc.languageeng
dc.publisherElsevier
dc.relationinfo:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S0927775713001015
dc.relationinfo:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.colsurfa.2013.01.065
dc.rightshttps://creativecommons.org/licenses/by-nc-nd/2.5/ar/
dc.rightsinfo:eu-repo/semantics/restrictedAccess
dc.subjectFe-MONTMORILLONITA
dc.subjectAGGREGATION
dc.subjectHUMIC ACID
dc.subjectCOLLOIDAL STABILITY
dc.titleExperimental determination of the colloidal stability of Fe(III)-montmorillonite: effects of organic matter, ionic strength and pH conditions
dc.typeArtículos de revistas
dc.typeArtículos de revistas
dc.typeArtículos de revistas


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