Please use this identifier to cite or link to this item: https://doi.org/10.1006/jcis.2000.7072
DC FieldValue
dc.titleDistinguishing adsorption and surface precipitation of phosphate on goethite (α-FeOOH)
dc.contributor.authorLi, L.
dc.contributor.authorStanforth, R.
dc.date.accessioned2014-06-17T08:31:25Z
dc.date.available2014-06-17T08:31:25Z
dc.date.issued2000-10-01
dc.identifier.citationLi, L.,Stanforth, R. (2000-10-01). Distinguishing adsorption and surface precipitation of phosphate on goethite (α-FeOOH). Journal of Colloid and Interface Science 230 (1) : 12-21. ScholarBank@NUS Repository. <a href="https://doi.org/10.1006/jcis.2000.7072" target="_blank">https://doi.org/10.1006/jcis.2000.7072</a>
dc.identifier.issn00219797
dc.identifier.urihttp://scholarbank.nus.edu.sg/handle/10635/66530
dc.description.abstractThe reaction between phosphate and goethite changes from adsorption into surface precipitation with no discernible changes in the adsorption isotherm. Distinguishing the two processes, by plotting the loss of phosphate from solution versus final phosphate concentration or based on theoretical calculations, is difficult. This paper presents a method for distinguishing between the two processes based on the change in zeta potential with increasing adsorption. During adsorption, the incoming phosphate results in a more negative surface charge as the more acidic phosphate ion replaces a less acidic surface hydroxyl. The amount of negative charge imparted to the surface should vary linearly with surface coverage for adsorption. Phosphate that is bound to a surface precipitate, on the other hand, imparts a much smaller negative charge to the surface, since there is no change in the character of the surface due to the additional phosphate. Zeta potential measurements of phosphated goethite at varying solution pH values and surface coverages are used to determine the transition point from adsorption to surface precipitation. The transition occurs at dissolved phosphate concentrations much lower than those calculated for phosphate in equilibrium with goethite and iron phosphate. (C) 2000 Academic Press.
dc.description.urihttp://libproxy1.nus.edu.sg/login?url=http://dx.doi.org/10.1006/jcis.2000.7072
dc.sourceScopus
dc.subjectAdsorption
dc.subjectGoethite
dc.subjectMobility
dc.subjectPhosphate
dc.subjectPrecipitation
dc.subjectSurface charge
dc.typeArticle
dc.contributor.departmentCHEMICAL & ENVIRONMENTAL ENGINEERING
dc.description.doi10.1006/jcis.2000.7072
dc.description.sourcetitleJournal of Colloid and Interface Science
dc.description.volume230
dc.description.issue1
dc.description.page12-21
dc.description.codenJCISA
dc.identifier.isiut000089732400002
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