Colloids and Surfaces A 538 (2018) 549–558 Contents lists available at ScienceDirect Colloids and Surfaces A journal homepage: www.elsevier.com/locate/colsurfa Eﬀect of pH on adsorption of anionic surfactants on limestone: Experimental study and surface complexation modeling M. Tagavifar , S.H. Jang, H. Sharma, D. Wang, L.Y. Chang, K. Mohanty, G.A. Pope Department of Petroleum and Geosystems Engineering, The University of Texas at Austin, 200 E. Dean Keeton St., Stop C0300, Austin, TX 78712-1585, USA GR APHICAL A BSTRACT ARTICLE I NFO ABSTRACT Keywords: We investigate surfactant adsorption on a model carbonate rock over a wide range of pH and surfactant-to-solid Surfactant adsorption ratios, by both an experimental and a theoretical approach, to obtain a quantitative understanding of how Carbonates mineral constituents aﬀect the adsorption equilibrium and dynamics. A combination of bulk mineralogy, ele- Surface complexation mental composition analysis, dissolution behavior, and water ionic composition data were used to characterize Geochemistry the samples’ surface heterogeneity. The adsorption of anionic surfactants is 2.4 mg/m at pH of ∼8 and de- creases approximately linearly with pH values above 9. To constrain and compare the relative adsorption aﬃnity and the likely modes of attachment on mineral constituents as pH changes, we performed surface complexation
Geoderma – Elsevier
Published: Feb 15, 2019
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