Abstract
The selective adsorption of the components of a polydisperse gemini surfactant blend (alkylbenzenesulfonate-Jeffamine salt, ABSJ) in aqueous solution onto Berea sandstone, a reference material in enhanced oil recovery (EOR), was investigated. The individual adsorption isotherms of the four, benzene-ring containing ABSJ components with different alkyl chain lengths (ranging from decyl to tridecyl of the alkyl chain length) were simultaneously determined by using a four-channel electrospay ionization mass spectrometer (ESI-MS) for concentration analysis. This analytical device provided selective information (based on the differences in the mass to charge ratio) on the adsorption of each component in the mixed surfactant system. The overall isotherm obtained from the superposition of the individual isotherms determined by ESI-MS agreed well with the isotherm determined by UV spectrometry; the UV equipment is benzene-ring sensitive, irrespective of the alkyl chain length. The S-shaped isotherms reached a plateau at the critical micelle concentration. Longer-chain surfactants adsorbed preferentially over the short chain homologs, independently of solution concentration. This analytical device provided the net adsorption isotherm. Most analytical methods are not component selective, and thus they are not able to measure the individual isotherms in multicomponent solutions. Here, we report on a novel method which describes the selective determination of the individual adsorption isotherms of surfactants in a multicomponent mixture. The theoretical background of the method is described in detail.
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Acknowledgements
This work was supported by MOL Hungarian Oil and Gas Plc, E&P, New Technologies and R&D, the Hungarian Scientific Research Fund (OTKA 68152), and The Project named “TÁMOP-4.2.1/B-09/1/KONV-2010-0005—Creating the Center of Excellence at the University of Szeged” supported by the European Union and co-financed by the European Regional Development Fund.
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Benkő, M., Puskás, S. & Király, Z. Application of mass spectrometry for study of the adsorption of multicomponent surfactant mixtures at the solid/solution interface. Adsorption 19, 71–76 (2013). https://doi.org/10.1007/s10450-012-9419-x
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DOI: https://doi.org/10.1007/s10450-012-9419-x