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Adsorption of fatty acids to layered double hydroxides in aqueous systems

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Abstract

Due to their anion exchange characteristics, layered double hydroxides (LDHs) are suitable for the detoxification of aqueous, fatty acid containing fermentation substrates. The aim of this study is to examine the adsorption mechanism, using crude glycerol from plant oil esterification as a model system. Changes in the intercalation structure in relation to the amount of fatty acids adsorbed are monitored by X-ray diffraction and infra-red spectroscopy. Additionally, calcination of LDH is investigated in order to increase the binding capacity for fatty acids. Our data propose that, at ambient temperature, fatty acids can be bound to the hydrotalcite by adsorption or in addition by intercalation, depending on fatty acid concentration. The adsorption of fatty acids from crude glycerol shows a BET-like behavior. Above a fatty acid concentration of 3.5 g L−1, intercalation of fatty acids can be shown by the appearance of an increased interlayer spacing. This observation suggests a two phase adsorption process. Calcination of LDHs allows increasing the binding capacity for fatty acids by more than six times, mainly by reduction of structural CO3 2−.

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Acknowledgments

This project was founded by the federal ministry of agriculture and consumer protection (BMELV) under the Project Number 22019409. The authors thank Pilot Pflanzenöltechnologie Magdeburg e. V. for the supply of crude glycerol and Florian Bager from the Institute of Technical Chemistry of the University of Kaiserslautern for the XRD analytics.

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Authors and Affiliations

  1. Bioprocess Engineering, University of Kaiserslautern, Gottlieb-Daimler-Str. 49, 67655, Kaiserslautern, Germany

    Sebastian Wiesen, Nils Tippkötter, Kai Muffler & Roland Ulber

  2. Clariant-Produkte (Deutschland) GmbH, Ostenrieder Str. 15, 85368, Moosburg, Germany

    Kirstin Suck, Ulrich Sohling & Friedrich Ruf

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  1. Sebastian Wiesen
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  2. Nils Tippkötter
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  3. Kai Muffler
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  6. Friedrich Ruf
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  7. Roland Ulber
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Correspondence to Sebastian Wiesen.

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Wiesen, S., Tippkötter, N., Muffler, K. et al. Adsorption of fatty acids to layered double hydroxides in aqueous systems. Adsorption 21, 459–466 (2015). https://doi.org/10.1007/s10450-015-9686-4

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  • DOI: https://doi.org/10.1007/s10450-015-9686-4

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