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Predicting the potential of capacitive deionization for the separation of pH‐dependent organic molecules

Wagner, Robin 1; Winger, Sebastian 1; Franzreb, Matthias ORCID iD icon 1
1 Institut für Funktionelle Grenzflächen (IFG), Karlsruher Institut für Technologie (KIT)


One of the main steps in the biotechnological production of chemical building blocks, such as, e.g. bio-based succinic acid which is used for lubricants, cosmetics, food, and pharmaceuticals, is the isolation and purification of the target molecule. A new approach to isolate charged, bio-based chemicals is by electrosorption onto carbon surfaces. In contrast to ion exchange, electrosorption does not require additional chemicals for elution and regeneration. However, while the electrosorption of inorganic salts is well understood and in commercial use, the knowledge about electrosorption of weak organic acids including the strong implications of the pH-dependent dissociation and their affinity towards physical adsorption must be expanded. Here, we show a detailed discussion of the main pH-dependent effects determining the achievable charge efficiencies and capacities. An explicit set of equations allows the fast prediction of the named key figures for constant voltage and constant current operation. The calculated and experimental results obtained for the electrosorption of maleic acid show that the potential-free adsorption of differently protonated forms of the organic acid play a dominating role in the process. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000136271
Veröffentlicht am 11.08.2021
DOI: 10.1002/elsc.202100037
Zitationen: 2
Web of Science
Zitationen: 2
Zitationen: 2
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Funktionelle Grenzflächen (IFG)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 10.2021
Sprache Englisch
Identifikator ISSN: 1618-0240, 1618-2863
KITopen-ID: 1000136271
HGF-Programm 43.33.11 (POF IV, LK 01) Adaptive and Bioinstructive Materials Systems
Erschienen in Engineering in life sciences
Verlag Wiley-VCH Verlag
Band 21
Heft 10
Seiten 589-606
Bemerkung zur Veröffentlichung Special Issue: Downstream Processing of Bioproducts – Part 2

This article also appears in: Downstream Processing of Bioproducts
Gefördert durch den KIT-Publikationsfonds
Vorab online veröffentlicht am 03.08.2021
Nachgewiesen in Web of Science
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