Characterizing the Influence of Organic Carboxylic Acids and Inorganic Silica Impurities on the Surface Charge of Natural Carbonates Using an Extended Surface Complexation Model

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dc.citation.firstpage957en_US
dc.citation.issueNumber2en_US
dc.citation.journalTitleEnergy Fuelsen_US
dc.citation.lastpage967en_US
dc.citation.volumeNumber33en_US
dc.contributor.authorSong, Jinen_US
dc.contributor.authorRezaee, Saraen_US
dc.contributor.authorZhang, Leileien_US
dc.contributor.authorZhang, Zhuqingen_US
dc.contributor.authorPuerto, Mauraen_US
dc.contributor.authorWani, Omar B.en_US
dc.contributor.authorVargas, Franciscoen_US
dc.contributor.authorAlhassan, Saeeden_US
dc.contributor.authorBiswal, Sibani L.en_US
dc.contributor.authorHirasaki, George J.en_US
dc.date.accessioned2019-08-12T17:16:51Zen_US
dc.date.available2019-08-12T17:16:51Zen_US
dc.date.issued2019en_US
dc.description.abstractIn this work, we developed an extended surface complexation model (SCM) that successfully fits all tested ζ-potential data (63 in total) of synthetic calcite and three natural carbonates (Iceland spar, Indiana limestone, “SME” rock from a Middle East field) in brines with divalent ions in a wide range of ionic strengths (0.001–0.5 M). To develop this extended model, our previous reported SCM is first optimized by incorporating the ζ-potential of synthetic calcite in a wide range of ionic strength (0.001–0.5 M) along with previously published data for parameter refitting. The model is then applied to predict the surface charge of synthetic calcite in concentrated solutions up to 5 M NaCl to reveal the role of high salinity in calcite wettability. Eventually, the model is extended to fit the ζ-potential of natural carbonates by adding surface reactions for impurities such as silica and organic-based carboxylic acids. The coverage of the organic impurities is found to be essential for explaining why the ζ-potential of natural carbonates is more negative compared to that of synthetic calcite. Naphthenic acid (assumed to have one carboxylic group) and humic/fulvic acid (assumed to have six carboxylic groups) are tested in the model calculation as possible sources of surface impurities to demonstrate the effect of the number of carboxylic groups in the acid molecule. Finally, the effect of a humic acid pretreatment on the ζ-potential of synthetic calcite is investigated experimentally to verify the assumption that absorbed organic impurities on the calcite surface contribute significantly to a more negatively charged natural carbonate surface when compared to that of pure calcite surfaces.en_US
dc.identifier.citationSong, Jin, Rezaee, Sara, Zhang, Leilei, et al.. "Characterizing the Influence of Organic Carboxylic Acids and Inorganic Silica Impurities on the Surface Charge of Natural Carbonates Using an Extended Surface Complexation Model." <i>Energy Fuels,</i> 33, no. 2 (2019) American Chemical Society: 957-967. https://doi.org/10.1021/acs.energyfuels.8b03896.en_US
dc.identifier.doihttps://doi.org/10.1021/acs.energyfuels.8b03896en_US
dc.identifier.urihttps://hdl.handle.net/1911/106215en_US
dc.language.isoengen_US
dc.publisherAmerican Chemical Societyen_US
dc.rightsThis is an author's peer-reviewed final manuscript, as accepted by the publisher. The published article is copyrighted by the American Chemical Society.en_US
dc.titleCharacterizing the Influence of Organic Carboxylic Acids and Inorganic Silica Impurities on the Surface Charge of Natural Carbonates Using an Extended Surface Complexation Modelen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpost-printen_US
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