The influence of feedwater pH on membrane charge ionization and ion rejection by reverse osmosis: An experimental and theoretical study : научное издание
Библиографическое описание:The influence of feedwater pH on membrane charge ionization and ion rejection by reverse osmosis: An experimental and theoretical study : научное издание / E. M. Kimani, M. Pranić, S. Porada [et al.]. - Текст : непосредственный // Journal of Membrane Science. - 2022. - Т. 660, № . - P. 120800. - ISSN 0376-7388, DOI 10.1016/j.memsci.2022.120800.
Аннотация:Modeling mass transport of ions across the polyamide active layer of a reverse osmosis (RO) membrane requires a comprehensive understanding of membrane structure and chemistry. For instance, membrane charge ionization and thus salt transport greatly depend on feedwater pH and composition, but these relations are not yet well understood. To address this gap in understanding, a one dimensional model is developed that couples transport of all ions using the extended Donnan steric partitioning pore model. The model includes membrane charge ionization as well as interaction with H+ and OH−-ions. The dependence of ion rejection and permeate pH is described as function of feedwater pH. Finally, model predictions are quantitatively compared with experimental data by adjusting a few fitting parameters using the Nelder-Mead algorithm. Contrary to other RO studies, we show that the polyamide is only weakly charged, but this small charge still plays a key role to determine membrane performance. These findings reveal the key role of local pH in the ionization of membrane functional groups, and how local charge affects overall membrane rejection of ions as well as permeate pH.
Издательство:Elsevier Science Publishing Company, Inc.
Источник:Journal of Membrane Science
Выпуск:Т. 660
Номера страниц:120800
Держатель оригинала документа:Environmental Technology, Wageningen University, Bornse Weilanden 9, 6708 WG, Wageningen, the Netherlands, Institute of Computational Modeling SB RAS, Akademgorodok 50-44, 660036, Krasnoyarsk, Russia, Membrane Science and Technology Cluster, University of Twente, Drienerlolaan 5, 7522 NB, Enschede, the Netherlands, Oasen Drinking Water Company, Nieuwe Gouwe O.Z. 3, 2801 SB, Gouda, the Netherlands, Siberian Federal University, Svobodny 79, 660041, Krasnoyarsk, Russia, Wetsus, European Centre of Excellence for Sustainable Water Technology, Oostergoweg 9, 8911 MA, Leeuwarden, the Netherlands
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