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Abstract
Capacitive deionization (CDI) is a desalination technique that can be applied for the separation of target ions from water streams. For instance, mono- and divalent cation selectivities were studied by other research groups in the context of water softening. Another focus is on removing Na+ from recirculated irrigation water (IW) in greenhouses, aiming to maintain nutrients. This is important as an excess of Na+ has toxic effects on plant growth by decreasing the uptake of other nutrients. In this study, we investigated the selective separation of sodium (Na+) and magnesium (Mg2+) in MCDI using a polyelectrolyte multilayer (PEM) on a standard grade cation-exchange membrane (Neosepta, CMX). Alternating layers of poly(allylamine hydrochloride) (PAH) and poly(styrene sulfonate) (PSS) were coated on a CMX membrane (CMX-PEM) using the layer-by-layer (LbL) technique. The layer formation was examined with X-ray photoelectron spectroscopy (XPS) and static water contact angle measurements (SWA) for each layer. For each membrane, i.e., the CMX-PEM membrane, CMX membrane, and for a special-grade cation-exchange membrane (Neosepta, CIMS), the Na+/Mg2+ selectivity was investigated by performing MCDI experiments, and selectivity values of 2.8 ± 0.2, 0.5 ± 0.04, and 0.4 ± 0.1 were found, respectively, over up to 40 cycles. These selectivity values indicate flexible switching from a Mg2+-selective membrane to a Na+-selective membrane by straightforward modification with a PEM. We anticipate that our modular functionalization method may facilitate the further development of ion-selective membranes and electrodes.
Original language | English |
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Pages (from-to) | 34746-34754 |
Number of pages | 9 |
Journal | ACS applied materials & interfaces |
Volume | 12 |
Issue number | 31 |
DOIs | |
Publication status | Published - 5 Aug 2020 |
Keywords
- capacitive deionization
- cation-exchange membrane
- mono/divalent cation selectivity
- polyelectrolyte multilayers
- sodium removal
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Dive into the research topics of 'Modification of Cation-Exchange Membranes with Polyelectrolyte Multilayers to Tune Ion Selectivity in Capacitive Deionization'. Together they form a unique fingerprint.Projects
- 1 Finished
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E-motion: Electro-motion for the sustainable recovery of high-value nutrients from waste water
1/11/16 → 31/10/22
Project: EU research project