A model for the zeta potential of copper sulphide

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dc.contributor.authorNduna, Moses
dc.contributor.authorLewis, Alison Emslie
dc.contributor.authorNortier, P
dc.date.accessioned2015-06-19T07:34:57Z
dc.date.available2015-06-19T07:34:57Z
dc.date.issued2014
dc.description.abstractA model is proposed for the zeta-potential versus pH curve of Covellite (CuS). The classical Gouy–Chapman–Stern treatment of the adsorption of protons is applied to a model surface derived from the crystallographic data. The surface charges are obtained by an original adaptation of the concepts from the MUSIC model to a sulphide, i.e. the analysis of the chemical bonding in Pauling’s electrostatic valence framework to derive partial surface charges. The authors develop a software for the fitting of p –pHcurves using IPHREEQC for the calculation of the zeta potential at each pH point and Matlab to drive the calculation of the whole pH set and the optimisation of the parameters: capacitances of the double layer,site densities, charges and acidity constants. The model successfully reproduces the experimental data,considering only two sulphided surface sites: introduction of an elemental sulphur layer or consideration of hydroxyl surface sites is not required to explain the charging behaviour of Covellite when carefully precipitated under nitrogen.en_ZA
dc.identifier.apacitationNduna, M., Lewis, A. E., & Nortier, P. (2014). A model for the zeta potential of copper sulphide. <i>Colloids and Surfaces A: Physicochemical and Engineering Aspects</i>, http://hdl.handle.net/11427/13087en_ZA
dc.identifier.chicagocitationNduna, Moses, Alison Emslie Lewis, and P Nortier "A model for the zeta potential of copper sulphide." <i>Colloids and Surfaces A: Physicochemical and Engineering Aspects</i> (2014) http://hdl.handle.net/11427/13087en_ZA
dc.identifier.citationNduna, M., Lewis, A.E. and Nortier, P. (2014). A model for the zeta potential of copper sulphide Colloids and Surfaces A: Physicochemical and Engineering Aspects, 441: 643–652en_ZA
dc.identifier.issn0927-7757en_ZA
dc.identifier.ris TY - Journal Article AU - Nduna, Moses AU - Lewis, Alison Emslie AU - Nortier, P AB - A model is proposed for the zeta-potential versus pH curve of Covellite (CuS). The classical Gouy–Chapman–Stern treatment of the adsorption of protons is applied to a model surface derived from the crystallographic data. The surface charges are obtained by an original adaptation of the concepts from the MUSIC model to a sulphide, i.e. the analysis of the chemical bonding in Pauling’s electrostatic valence framework to derive partial surface charges. The authors develop a software for the fitting of p –pHcurves using IPHREEQC for the calculation of the zeta potential at each pH point and Matlab to drive the calculation of the whole pH set and the optimisation of the parameters: capacitances of the double layer,site densities, charges and acidity constants. The model successfully reproduces the experimental data,considering only two sulphided surface sites: introduction of an elemental sulphur layer or consideration of hydroxyl surface sites is not required to explain the charging behaviour of Covellite when carefully precipitated under nitrogen. DA - 2014 DB - OpenUCT DO - 10.1016/j.colsurfa.2013.10.024 DP - University of Cape Town J1 - Colloids and Surfaces A: Physicochemical and Engineering Aspects KW - Zeta potential KW - Model KW - MUSIC KW - IPhreeqc KW - Matlaba LK - https://open.uct.ac.za PB - University of Cape Town PY - 2014 SM - 0927-7757 T1 - A model for the zeta potential of copper sulphide TI - A model for the zeta potential of copper sulphide UR - http://hdl.handle.net/11427/13087 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/13087
dc.identifier.urihttp://dx.doi.org/10.1016/j.colsurfa.2013.10.024
dc.identifier.vancouvercitationNduna M, Lewis AE, Nortier P. A model for the zeta potential of copper sulphide. Colloids and Surfaces A: Physicochemical and Engineering Aspects. 2014; http://hdl.handle.net/11427/13087.en_ZA
dc.languageengen_ZA
dc.publisherElsevieren_ZA
dc.publisher.departmentCrystallisation and Precipitation Researchen_ZA
dc.publisher.facultyFaculty of Engineering and the Built Environment
dc.publisher.institutionUniversity of Cape Town
dc.sourceColloids and Surfaces A: Physicochemical and Engineering Aspectsen_ZA
dc.source.urihttp://www.journals.elsevier.com/colloids-and-surfaces-a-physicochemical-and-engineering-aspects
dc.subjectZeta potential
dc.subjectModel
dc.subjectMUSIC
dc.subjectIPhreeqc
dc.subjectMatlaba
dc.titleA model for the zeta potential of copper sulphideen_ZA
dc.typeJournal Articleen_ZA
uct.subject.keywordsCopper sulphideen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceArticleen_ZA
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