Journal
BIOMACROMOLECULES
Volume 14, Issue 5, Pages 1705-1709Publisher
AMER CHEMICAL SOC
DOI: 10.1021/bm400377e
Keywords
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Funding
- Japan Society for the Promotion of Science (JSPS) [21228007, 21-6112]
- Grants-in-Aid for Scientific Research [13J07327, 11J03027, 21228007, 23688020] Funding Source: KAKEN
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Biobased membranes that can selectively permeate hydrogen gas have been developed from aqueous dispersions of 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-oxidized cellulose nanofibrils (TOCN) prepared from wood cellulose: TOCN-coated plastic films and self-standing TOCN films. Compared with TOCNs with sodium, lithium, potassium, and cesium carboxylate groups, TOCN with free carboxyl groups (TOCN-COOH) had much high and selective H-2 gas permeation performance. Because permeabilities of H-2, N-2, O-2, and CO2 gases through the membranes primarily depended on their kinetic diameters, the gas permeation behavior of the various TOCNs can be explained in terms of a diffusion mechanism. Thus, the selective H-2 gas permeability for TOCN-COOH was probably due to a larger average size in free volume holes present between nanofibrils in the layer and film than those of other TOCNs with metal carboxylate groups. The obtained results indicate that TOCN-COOH membranes are applicable as biobased H-2 gas separation membranes in fuel cell electric power generation systems.
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