Non-steady diffusion and adsorption of organic micropollutants in ion-exchange membranes: effect of the membrane thickness

iScience

Pawel Roman¹  Rhea Verbeke²  Werner Egger³  Marcel Dickmann⁴  Ivo Vankelecom⁴  Marjolein Vanoppen⁵  Jan Post⁶  Emile Cornelissen⁷  Karel Keesman⁷  Arne Verliefde⁸  Leonardo Gutierrez⁸  Malgorzata Roman⁸ 

[1] Centre for Advanced Process Technology for Urban Resource Recovery (CAPTURE), Particle and Interfacial Technology Group, Ghent University, Coupure Links 653, 9000 Ghent, Belgium;Corresponding author;Facultad del Mar y Medio Ambiente, Universidad Del Pacifico, Ecuador;Centre for Advanced Process Technology for Urban Resource Recovery (CAPTURE), Particle and Interfacial Technology Group, Ghent University, Coupure Links 653, 9000 Ghent, Belgium;Centre for Membrane Separations, Adsorption, Catalysis and Spectroscopy for Sustainable Solutions (cMACS), KU Leuven, Celestijnenlaan 200F p. o. box 2461, 3001 Leuven, Belgium;Heinz Maier-Leibnitz Zentrum (MLZ), Technische Universität München, Lichtenbergstr. 1, 85748 Garching, Germany and Physik-Department E21, Technische Universität München, James-Franck-Str. 1, 85748 Garching, Germany;Institut für Angewandte Physik und Messtechnik, Universität der Bundeswehr München, Werner-Heisenberg-Weg 39, 85577 Neubiberg, Germany;Wetsus, European Centre of Excellence for Sustainable Water Technology, Oostergoweg 9, 8911 MA Leeuwarden, the Netherlands;

关键词: chemistry;    environmental chemical engineering;    environmental science;    chemical engineering;   

DOI  :  

来源: DOAJ

【 摘 要 】

Summary: There is no efficient wastewater treatment solution for removing organic micropollutants (OMPs), which, therefore, are continuously introduced to the Earth's surface waters. This creates a severe risk to aquatic ecosystems and human health. In emerging water treatment processes based on ion-exchange membranes (IEM), transport of OMPs through membranes remains unknown. We performed a comprehensive investigation of the OMP transport through a single IEM under non-steady-state conditions. For the first time, positron annihilation lifetime spectroscopy was used to study differences in the free volume element radius between anion- and cation-exchange membranes, and between their thicknesses. The dynamic diffusion-adsorption model was used to calculate the adsorption and diffusion coefficients of OMPs. Remarkably, diffusion coefficients increased with the membrane thickness, where its surface resistance was more evident in thinner membranes. Presented results will contribute to the improved design of next-generation IEMs with higher selectivity toward multiple types of organic compounds.

【 授权许可】

Unknown