One-step exfoliation and etching of layered double hydroxide nanosheets to construct nanofiltration membranes with high water permeance

Lu, Yahua; He, Yafei; Li, Jie; Wang, Naixin; An, Quan-Fu

doi:10.1016/j.seppur.2024.129180

Separation and Purification Technology

2025

DOI: 10.1016/j.seppur.2024.129180

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One-step exfoliation and etching of layered double hydroxide nanosheets to construct nanofiltration membranes with high water permeance

Yahua Lu,

Yafei He,

Jie Li

et al.

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Composite Anion Exchange Membranes Containing a Long-Side Chain Ionomer and Exfoliated Lamellar Double Hydroxides

Narducci,

Syahputra,

Di Vona

et al. 2024

Membranes

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Anion Exchange Membranes (AEMs) are promising materials for electrochemical devices, such as fuel cells and electrolyzers. However, the main drawback of AEMs is their low durability in alkaline operating conditions. A possible solution is the use of composite ionomers containing inorganic fillers stable in a basic environment. In this work, composite anion exchange membranes are prepared from poly (2,6-dimethyl-1,4-phenylene oxide) with quaternary ammonium groups on long-side chains (PPO-LC) and exfoliated Mg/Al lamellar double hydroxide (LDH) as inorganic filler added in different percentages (2, 5, and 10%). The mechanical stiffness of the membranes increases significantly by the addition of exfoliated LDH up to 5%. The ionic conductivity is measured as a function of the temperature in fully humidified conditions and as a function of relative humidity (RH). The maximum conductivity is observed for 5% LDH. The average activation energy for conductivity amounts to 0.20 ± 0.01 eV in fully humidified conditions and >50% RH. Thermogravimetric analysis of membranes before and after alkaline degradation tests (2 M KOH @ 80 °C, 48 h) reveals that the sample with 5% LDH has improved stability (19% vs. 36% of degradation). The stability tests are also investigated, measuring the ionic conductivity and the water uptake. A protective effect of LDH on the alkaline degradation of quaternary ammonium groups is clearly evidenced and opens the way to the use of different compounds and exfoliation methods in the LDH family.

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Composite Anion Exchange Membranes Containing a Long-Side Chain Ionomer and Exfoliated Lamellar Double Hydroxides

Narducci,

Syahputra,

Di Vona

et al. 2024

Membranes

View full text Add to dashboard Cite

show abstract

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One-step exfoliation and etching of layered double hydroxide nanosheets to construct nanofiltration membranes with high water permeance

Cited by 1 publication

References 31 publications

Composite Anion Exchange Membranes Containing a Long-Side Chain Ionomer and Exfoliated Lamellar Double Hydroxides

Composite Anion Exchange Membranes Containing a Long-Side Chain Ionomer and Exfoliated Lamellar Double Hydroxides

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