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dc.contributor.authorSoutham, Daniel
dc.contributor.authorLewis, T.
dc.contributor.authorMcFarlane, A.
dc.contributor.authorBorrmann, T.
dc.contributor.authorJohnston, J.
dc.date.accessioned2017-01-30T13:28:10Z
dc.date.available2017-01-30T13:28:10Z
dc.date.created2008-11-12T23:32:58Z
dc.date.issued2007
dc.identifier.citationSoutham, Daniel C. and Lewis, Trevor W. and McFarlane, Andrew J. and Borrmann, T. and Johnston, Jim H.. 2007. Calcium-phosphorus interactions at a nano-structured silicate surface. Journal of Colloid and Interface Science 319: 489-497.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/31928
dc.identifier.doi10.1016/j.jcis.2007.12.012
dc.description.abstract

Nano-structured calcium silicate (NCS), a highly porous material synthesized by controlledprecipitation from geothermal fluids or sodium silicate solution, was developed as filler for use inpaper manufacture. NCS has been shown to chemisorb orthophosphate from an aqueous solutionprobably obeying a Freundlich isotherm with high selectivity compared to other commonenvironmental anions. Microanalysis of the products of chemisorption indicated there wassignificant change from the porous and nano-structured morphology of pristine NCS to fibrous andcrystalline morphologies and non-porous detritus. X-ray diffraction analysis of the crystallineproducts showed it to be brushite, CaHPO4?2H2O, while the largely x-ray amorphous componentwas a mixture of calcium phosphates. A two-step mechanism was proposed for the chemisorption ofphosphate from an aqueous solution by NCS. The first step, which was highly dependent on pH, wasthought to be desorption of hydroxide ions from the NCS surface. This was kinetically favoured atlower initial pH, where the predominant form of phosphate present was H2PO4-, and led to decreasedphosphorus uptake with increasing pH. The second step was thought to be a continuingchemisorption process after stabilization of the pH-value. The formation of brushite as the primarychemisorption product was found to be consistent with the proposed mechanism.

dc.publisherElsevier
dc.subjectcalcium phosphate
dc.subjectphosphate sequestration
dc.subjecthydroxyapatite inhibition
dc.subjectNano-structured calcium silicate
dc.subjectchemisorption
dc.titleCalcium-phosphorus interactions at a nano-structured silicate surface
dc.typeJournal Article
dcterms.source.volume319
dcterms.source.startPage489
dcterms.source.endPage497
dcterms.source.titleJournal of Colloid and Interface Science
curtin.note

Copyright 2008 Elsevier B.V. All rights reserved

curtin.identifierEPR-2700
curtin.accessStatusOpen access
curtin.facultyDepartment of Applied Chemistry
curtin.facultyDivision of Engineering, Science and Computing
curtin.facultyFaculty of Science


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