期刊
CARBOHYDRATE POLYMERS
卷 278, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2021.118938
关键词
Nanocellulose; Membrane; Ion conductivity; Ion selectivity; Crosslinking
资金
- Digital Cellulose Centre
- Wallenberg Wood Science Center (Knut and Alice Wallenberg Foundation)
- Karl-Erik Onnesjo Foundation
- Treesearch, a collaboration platform for Swedish forest industrial research
This study presents a low-cost cation-selective membrane prepared from renewable nanocellulose and 1,2,3,4-butanetetracarboxylic acid. By controlling the degree of crosslinking, the nanochannel structure and surface charge concentration can be simultaneously adjusted to achieve desired ion transport properties.
Ion selective membranes are at the heart of energy conversion and harvesting, water treatment, and biotechnologies. The currently available membranes are mostly based on expensive and non-biodegradable polymers. Here, we report a cation-selective and low-cost membrane prepared from renewable nanocellulose and 1,2,3,4-butanetetracarboxylic acid which simultaneously serves as crosslinker and source of anionic surface groups. Charge density and structure of the membranes are studied. By using different degrees of crosslinking, simultaneous control over both the nanochannel structure and surface charge concentration is achieved, which in turn determines the resulting ion transport properties. Increasing negative charge concentration via higher crosslinker content, the obtained ion conductivity reaches up to 8 mS/cm (0.1 M KCl). Optimal ion selectivity, also influenced by the solution pH, is achieved at 20 wt% crosslinker addition (with ion conductivity of 1.6 mS/cm). As regular similar to 1.4 nm nanochannels were formed at this composition, nanofluidic contribution to ion transport is likely.
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