Study of molecular interfaces in polymer thin-film composite membranes for the efficient gas separations

用于高效气体分离的聚合物薄膜复合膜分子界面研究

• 批准号: 22K04806
• 负责人: Selyanchyn Roman
• 金额: $ 2.58万
• 依托单位: Kyushu University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2022
• 资助国家: 日本
• 起止时间: 2022-04-01 至 2025-03-31
• 项目状态: 未结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-22K04806/
• 关键词: gas separation; thin-film composite; carbon dioxide; molecular interface; interface selectivity; selective interface; CO2/N2 separation; polymer interface; CO2 philicity

This work is devoted to developing and investigating thin-film composite (TFC) membranes with selective molecularly-thin interfaces between polymers to achieve efficient carbon dioxide (CO2) separation from complex mixtures with other gases. During the first year, the research is progressing according to the original plan. The focus was to investigate how the surface modification of the hydrophobic polymer layer by water vapor-generated plasma influences the formation of the selective interface with the hydrophilic selective layer. It was found that some minimum critical amount of surface modification is essential to form the proper laminate structure. Furthermore, the influence of surface modification by the plasma treatment alone was found insufficient to increase the membrane's selectivity towards CO2.The gas transport of CO2, O2, and N2 was thoroughly studied. The existence of the molecular interface was found to be the essential factor in the highly selective CO2/N2 and CO2/O2 separation. With the inclusion of the selective interface in the structure of the TFC, the selectivity increased to about 35 and 13 for CO2/N2 and CO2/O2 separation, respectively (~10 and ~5 in the membranes without the selective layer and interface). Finally, this work focuses on their membrane application for the direct air capture of CO2. Direct air capture is an important technology to mitigate the effects of climate change. By capturing carbon dioxide directly from the air, we can reduce the amount of greenhouse gases in the atmosphere and slow down the rate of global warming.

这项工作致力于开发和研究薄膜复合（TFC）膜与聚合物之间的选择性分子薄界面，以实现有效的二氧化碳（CO2）从复杂的混合物与其他气体的分离。在第一年，研究工作正在按原计划进行。重点是研究如何通过水蒸气产生的等离子体的疏水性聚合物层的表面改性的影响与亲水性选择性层的选择性界面的形成。有人发现，一些最小的临界量的表面改性是必不可少的，以形成适当的层压结构。此外，发现单独的等离子体处理的表面改性的影响不足以提高膜对CO2的选择性。CO2，O2和N2的气体传输进行了深入的研究。发现分子界面的存在是高选择性分离CO2/N2和CO2/O2的关键因素。在TFC结构中包括选择性界面的情况下，对于CO2/N2和CO2/O2分离的选择性分别增加到约35和13（在没有选择性层和界面的膜中为约10和约5）。最后，这项工作的重点是他们的膜应用直接空气捕获二氧化碳。直接空气捕获是减缓气候变化影响的一项重要技术。通过直接从空气中捕获二氧化碳，我们可以减少大气中温室气体的数量，减缓全球变暖的速度。

项目成果

CO2 preconcentration from air with the aid of membranes and its potential for distributed CO2 utilization systems

借助膜从空气中预浓缩二氧化碳及其分布式二氧化碳利用系统的潜力

• 发表时间: 2022
• 作者: 執筆者：59名;技術情報協会;Roman Selyanchyn
• 通讯作者: Roman Selyanchyn