Zhou Siyu, Guan Kecheng, Li Zhan, Xu Ping, Fang Shang, Zhang Aiwen, Wang Zheng, He Shengnan, Nakagawa Keizo, Matsuyama Hideto
Research Center for Membrane and Film Technology, Kobe University, 1-1 Rokkodai, Nada, Kobe, 657-8501, Japan.
Department of Chemical Science and Engineering, Kobe University, 1-1 Rokkodai, Nada, Kobe, 657-8501, Japan.
Small. 2024 Aug;20(34):e2311237. doi: 10.1002/smll.202311237. Epub 2024 Apr 9.
Chemically converted graphene oxide laminate membranes, which exhibit stable interlayered nanochannels in aqueous environments, are receiving increasing attention owing to their potential for selective water and ion permeation. However, how the molecular properties of conversion agents influence the stabilization of nanochannels and how effectively nanochannels are stabilized have rarely been studied. In this study, mono-, di-, and tri-saccharide molecules of glucose (Glu), maltose (Glu2), and maltotriose (Glu3) are utilized, respectively, to chemically modify graphene oxide (GO). The aim is to create nanochannels with different levels of stability and investigate how these functional conversion agents affect the separation performance. The effects of the property differences between different conversion agents on nanochannel stabilization are demonstrated. An agent with efficient chemical reduction of GO and limited intercalation in the resulting nanochannel ensures satisfactory nanochannel stability during desalination. The stabilized membrane nanochannel exhibits a permeance of 0.69 L m h bar and excellent NaSO rejection of 96.42%. Furthermore, this optimized membrane nanochannel demonstrates enhanced stability under varying external conditions compared to the original GO. This study provides useful information for the design of chemical conversion agents for GO nanochannel stabilization and the development of nanochannel membranes for precise separation.
化学转化的氧化石墨烯层压膜在水性环境中表现出稳定的层间纳米通道，因其在选择性水和离子渗透方面的潜力而受到越来越多的关注。然而，转化剂的分子性质如何影响纳米通道的稳定性以及纳米通道的稳定效果如何，鲜有研究。在本研究中，分别利用葡萄糖（Glu）、麦芽糖（Glu2）和麦芽三糖（Glu3）的单糖、二糖和三糖分子对氧化石墨烯（GO）进行化学改性。目的是创建具有不同稳定程度的纳米通道，并研究这些功能性转化剂如何影响分离性能。展示了不同转化剂之间性质差异对纳米通道稳定化的影响。一种能有效化学还原GO且在所得纳米通道中插层有限的试剂，可确保在脱盐过程中纳米通道具有令人满意的稳定性。稳定后的膜纳米通道的渗透通量为0.69 L m⁻² h⁻¹ bar，对Na₂SO₄的截留率高达96.42%。此外，与原始的GO相比，这种优化后的膜纳米通道在不同外部条件下表现出更高的稳定性。本研究为设计用于稳定GO纳米通道的化学转化剂以及开发用于精确分离的纳米通道膜提供了有用信息。
