Heo Jiwoong, Choi Moonhyun, Chang Jungyun, Ji Dahye, Kang Sang Wook, Hong Jinkee
School of Chemical Engineering & Material Science, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul, 06974, Republic of Korea.
Department of Chemistry, Sangmyung University, Seoul, 03016, Republic of Korea.
Sci Rep. 2017 Mar 28;7(1):456. doi: 10.1038/s41598-017-00433-z.
Separation of CO from other gasses offers environmental benefits since CO gas is the main contributor to global warming. Recently, graphene oxide (GO) based gas separation membranes are of interest due to their selective barrier properties. However, maintaining selectivity without sacrificing permeance is still challenging. Herein, we described the preparation and characterization of nanoscale GO membranes for CO separation with both high selectivity and permeance. The internal structure and thickness of the GO membranes were controlled by layer-by-layer (LbL) self-assembly. Polyelectrolyte layers are used as the supporting matrix and for facilitating CO transport. Enhanced gas separation was achieved by adjusting pH of the GO solutions and by varying the number of GO layers to provide a pathway for CO molecules. Separation performance strongly depends on the number of GO bilayers. The surfaces of the multilayered GO and polyelectrolyte films are characterized by atomic force microscopy and scanning electron microscopy. The (poly (diallyldimethylammonium chloride) (PDAC)/polystyrene sulfonate (PSS)) (GO/GO) multilayer membranes show a maximum CO/N selectivity of 15.3 and a CO permeance of 1175.0 GPU. LbL-assembled GO membranes are shown to be effective candidates for CO separation based on their excellent CO/N separation performance.
从其他气体中分离出一氧化碳具有环境效益，因为一氧化碳气体是全球变暖的主要促成因素。近来，基于氧化石墨烯（GO）的气体分离膜因其选择性阻隔特性而备受关注。然而，在不牺牲渗透率的情况下保持选择性仍然具有挑战性。在此，我们描述了用于一氧化碳分离的具有高选择性和渗透率的纳米级氧化石墨烯膜的制备与表征。氧化石墨烯膜的内部结构和厚度通过逐层（LbL）自组装来控制。聚电解质层用作支撑基质并促进一氧化碳传输。通过调节氧化石墨烯溶液的pH值以及改变氧化石墨烯层数以为一氧化碳分子提供通道，实现了增强的气体分离。分离性能强烈依赖于氧化石墨烯双层的数量。多层氧化石墨烯和聚电解质膜的表面通过原子力显微镜和扫描电子显微镜进行表征。（聚二烯丙基二甲基氯化铵（PDAC）/聚苯乙烯磺酸盐（PSS））（GO/GO）多层膜显示出最大一氧化碳/氮气选择性为15.3，一氧化碳渗透率为1175.0 GPU。基于其优异的一氧化碳/氮气分离性能，逐层组装的氧化石墨烯膜被证明是一氧化碳分离的有效候选材料。
