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dc.contributor.authorWang, L.
dc.contributor.authorPutnis, Christine
dc.contributor.authorRuiz-Agudo, E.
dc.contributor.authorHövelmann, J.
dc.contributor.authorPutnis, Andrew
dc.date.accessioned2017-01-30T12:48:48Z
dc.date.available2017-01-30T12:48:48Z
dc.date.created2015-10-29T04:09:53Z
dc.date.issued2015
dc.identifier.citationWang, L. and Putnis, C. and Ruiz-Agudo, E. and Hövelmann, J. and Putnis, A. 2015. In situ imaging of interfacial precipitation of phosphate on goethite. Environmental Science and Technology. 49 (7): pp. 4184-4192.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/25511
dc.identifier.doi10.1021/acs.est.5b00312
dc.description.abstract

Adsorption and subsequent immobilization of orthophosphate on iron oxides is of considerable importance in soil fertility and eutrophication studies. Here, in situ atomic force microscopy (AFM) has been used to probe the interaction of phosphate-bearing solutions with goethite, a-FeOOH, (010) cleavage surfaces. During the dissolution of goethite we observed simultaneous nucleation of nanoparticles (1.0-3.0 nm in height) of iron phosphate (Fe-P) phases at the earliest nucleation stages, subsequent aggregation to form secondary particles (about 6.0 nm in height) and layered precipitates under various pH values and ionic strengths relevant to acid soil solution conditions. The heterogeneous nucleation rates of Fe-P precipitates at phosphate concentrations ranging from 5.0 to 50.0 mM were quantitatively defined. Enhanced goethite dissolution in the presence of high concentration NaCl or AlCl<inf>3</inf> leads to a rapid increase in Fe-P nucleation rates, whereas low concentration MgCl<inf>2</inf> inhibits goethite dissolution, this in turn influences Fe-P nucleation. Moreover, kinetic data analyses show that low concentrations of citrate caused an increase in the nucleation rate of Fe-P phases. However, at higher concentrations of citrate, nucleation acceleration was reversed with much longer induction times to form Fe-P nuclei. These in situ observations may improve the mechanistic understanding of processes resulting in phosphate immobilization by goethite-rich acid soils in the presence of various inorganic and organic additive molecules.

dc.publisherAmerican Chemical Society
dc.titleIn situ imaging of interfacial precipitation of phosphate on goethite
dc.typeJournal Article
dcterms.source.volume49
dcterms.source.number7
dcterms.source.startPage4184
dcterms.source.endPage4192
dcterms.source.issn0013-936X
dcterms.source.titleEnvironmental Science and Technology
curtin.departmentDepartment of Chemistry
curtin.accessStatusFulltext not available


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