Selective Permeation of Hydrogen Gas Using Cellulose Nanofibril Film
Selective Permeation of Hydrogen Gas Using Cellulose Nanofibril Film
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DOI：
10.1021/bm400377e
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发表时间：
2013-05-01
影响因子：
6.2
通讯作者：
Isogai, Akira
中科院分区：
文献类型：
--
作者：
Fukuzumi, Hayaka;Fujisawa, Shuji;Isogai, Akira
从木质纤维素制备的2，2，6，6-四甲基哌啶-1-氧基（克里思）-氧化纤维素纳米纤丝（TOCN）的水分散体中开发了可选择性渗透氢气的生物基膜：TOCN涂覆的塑料膜和自立式TOCN膜。与含羧酸钠、羧酸锂、羧酸钾和羧酸铯的TOCN相比，含游离羧基的TOCN（TOCN-COOH）具有更高的选择性H-2气体渗透性能。由于H-2，N-2，O-2和CO2气体通过膜的渗透性主要取决于它们的动力学直径，因此各种TOCN的气体渗透行为可以用扩散机制来解释。因此，TOCN-COOH的选择性H-2气体渗透性可能是由于层和膜中的纳米原纤维之间存在的自由体积孔的平均尺寸大于具有金属羧酸盐基团的其他TOCN的自由体积孔的平均尺寸。所获得的结果表明TOCN-COOH膜可用作燃料电池发电系统中的生物基H-2气体分离膜。
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.