Surface Chemical Characterisation of Pyrite Exposed to Acidithiobacillus ferrooxidans and Associated Extracellular Polymeric Substances

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dc.citation.issue4
dc.citation.volume8
dc.contributor.authorLa Vars SM
dc.contributor.authorNewton K
dc.contributor.authorQuinton JS
dc.contributor.authorCheng P-Y
dc.contributor.authorWei D-H
dc.contributor.authorChan Y-L
dc.contributor.authorHarmer SL
dc.date.accessioned2023-12-11T20:53:24Z
dc.date.accessioned2024-07-25T06:50:40Z
dc.date.available2023-12-11T20:53:24Z
dc.date.available2024-07-25T06:50:40Z
dc.date.issued2018-04-01
dc.description.abstractA. ferrooxidans and their metabolic products have previously been explored as a viable alternative depressant of pyrite for froth flotation; however, the mechanism by which separation is achieved is not completely understood. Scanning electron microscopy (SEM), photoemission electron microscopy (PEEM), time-of-flight secondary ion mass spectrometry (ToF-SIMS) and captive bubble contact angle measurements have been used to examine the surface physicochemical properties of pyrite upon exposure to A. ferrooxidans grown in HH medium at pH 1.8. C K-edge near edge X-ray absorption fine structure (NEXAFS) spectra collected from PEEM images indicate hydrophilic lipids, fatty acids and biopolymers are formed at the mineral surface during early exposure. After 168 h, the spectra indicate a shift towards protein and DNA, corresponding to an increase in cell population and biofilm formation on the surface, as observed by SEM. The Fe L-edge NEXAFS show gradual oxidation of the mineral surface from Fe(II) sulfide to Fe(III) oxyhydroxides. The oxidation of the iron species at the pyrite surface is accelerated in the presence of A. ferrooxidans and extracellular polymeric substances (EPS) as compared to HH medium controls. The surface chemical changes induced by the interaction with A. ferrooxidans show a significant decrease in surface hydrophobicity within the first 2 h of exposure. The implications of these findings are the potential use of EPS produced during early attachment of A. ferrooxidans, as a depressant for bioflotation.
dc.identifier.author-urlhttp://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000434883100012&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=c5bb3b2499afac691c2e3c1a83ef6fef
dc.identifier.citationLa Vars SM, Newton K, Quinton JS, Cheng PY, Wei DH, Chan YL, Harmer SL. (2018). Surface chemical characterisation of pyrite exposed to acidithiobacillus ferrooxidans and associated extracellular polymeric substances. Minerals. 8. 4.
dc.identifier.doi10.3390/min8040132
dc.identifier.eissn2075-163X
dc.identifier.elements-typejournal-article
dc.identifier.issn2075-163X
dc.identifier.numberARTN 132
dc.identifier.urihttps://mro.massey.ac.nz/handle/10179/70996
dc.publisherMDPI (Basel, Switzerland)
dc.relation.isPartOfMinerals
dc.rights(c) 2018 The Author/s
dc.rightsCC BY 4.0
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectNEXAFS
dc.subjectPEEM
dc.subjectA. ferrooxidans
dc.subjectpyrite
dc.subjectToF-SIMS
dc.subjectbiofilm
dc.subjectEPS
dc.titleSurface Chemical Characterisation of Pyrite Exposed to Acidithiobacillus ferrooxidans and Associated Extracellular Polymeric Substances
dc.typeJournal article
pubs.elements-id452200
pubs.organisational-groupOther
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