Hybrid polyelectrolyte-anion exchange membrane and its interaction with phosphate

We have investigated in detail properties of hybrid polyelectrolyte-anion exchange membranes (AEMs) having different amounts of a guanidinium-modified poly(allylamine hydrochloride) (PAH-Gu) derivative (2, 5, and 8 wt%). The presence of guanidinium groups at the membrane surface was confirmed by XPS...

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Bibliographic Details
Published in:Reactive & functional polymers 2018-12, Vol.133, p.126-135
Main Authors: Paltrinieri, Laura, Poltorak, Lukasz, Chu, Liangyong, Puts, Theo, van Baak, Willem, Sudhölter, Ernst J.R., de Smet, Louis C.P.M.
Format: Article
Language:English
Subjects:
Anion exchanging
Anion-exchange membrane
Chemical reactions
Electrodialysis
Functional groups
Interaction
Ion transport
Membranes
Phosphate
Phosphates
Polyelectrolytes
Sodium
Sodium sulfate
Sulfate
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Summary:We have investigated in detail properties of hybrid polyelectrolyte-anion exchange membranes (AEMs) having different amounts of a guanidinium-modified poly(allylamine hydrochloride) (PAH-Gu) derivative (2, 5, and 8 wt%). The presence of guanidinium groups at the membrane surface was confirmed by XPS. For 2 and 5 wt% the blended membranes are homogeneous, while at 8 wt% segregation is observed by AFM. The membrane permselectivity and ionic electrical resistance for phosphate reduce upon incorporation of the PAH-Gu in the membrane, reflecting an increased co-ion (H+ and Na+) permeation. We conclude that PAH-Gu loaded in the AEM favors an interaction with phosphate. In electrodialysis, using sodium sulfate and sodium dihydrogen phosphate at equal concentrations in the source phase a slight preference for phosphate was observed. Our work shows that this facile membrane fabrication procedure shows great potential in terms of tuning the membrane properties. One way to boost selective ion transport could be by increasing the number of functional groups in the membrane.
ISSN:1381-5148
1873-166X
DOI:10.1016/j.reactfunctpolym.2018.10.005