Journal
JOURNAL OF MOLECULAR LIQUIDS
Volume 227, Issue -, Pages 106-113Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.molliq.2016.11.108
Keywords
Acetic acid; Nuclear magnetic resonance (NMR); Ionic formation; Ionic strength; Dissociation constant; NMR self-diffusion; Ionic pollutant; Nanofiltration
Funding
- Deutscher Akademischer Austauschdienst (DAAD) [57247627]
- Ministerium fur Innovation, Wissenschaft und Forschung des Landes Nordrhein-Westfalen
- Senatsverwaltung fur Wirtschaft, Technologie und Forschung des Landes Berlin
- Bundesministerium fur Bildung und Forschung
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The formation of ionic charge carriers and their transport in acetic acid (CH3COOH): water mixtures have been investigated by C-13 and H-1 NMR. The obtained dissociation constant from the NMR measurements is close to pK(a) = 4.70 in a highly diluted system which is in full agreement with literature values. The maximum molar concentration of ions (H3O+ and CH3COO-) is found at a water mole fraction around 0:5 to 0.6. Remarkably, minima in the molecular diffusion coefficients and ionic mobility are observed at this concentration. Ionic concentrations, ionic strength and the pH curve were obtained for any water content based on the C-13 and H-1 NMR as well as pH measurements and the numerical calculations. The data is relevant for the understanding and optimization of the properties of polymeric nanofiltration membranes for organic ion removal. They provide interesting insight into the water dependence of the viscoelastic and kinematic properties, the charge formation mechanism and the dissociation limit, especially for highly diluted systems simulating the case of ionic pollutants. (C) 2016 Elsevier B.V. All rights reserved.
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