Abstract:

Two-dimensional transition metal carbon (nitrogen) compound MXene (Ti₃C₂T _x ) has been widely concerned in the field of membrane separation because of its hydrophilicity and adjustable layer spacing. However, laminar flow MXene films are easy to be peeled off from the substrate. Therefore, the key to its industrial application is to select appropriate substrate materials and increase the adhesion between MXene films and substrate materials. The MXene pervaporation separation membrane material was prepared by self-cross-linking reaction using α-Al₂O₃ particles and SiO₂-ZrO₂ sol as the support of macroporous α-Al₂O₃ ceramic tube. The effects of Ti₃C₂T _x nanosheet loading, isopropanol concentration and operating temperature on the pervaporation separation performance of MXene membrane in isopropanol/water system were investigated. The results showed that: The layered structure formed by MXene nanosheets was conducive to blocking large diameter isopropanol molecules from passing through the interlayer pore. When the loading of MXene nanosheets was 1.97mg/cm², MXene membrane exhibited high dehydration performance at 55℃ for 90% isopropanol/water system, and the water content of the permeation side was 95.51%. The flux can reach 485.13g/(m²·h). The new MXene membrane based on macroporous α-Al₂O₃ carrier tube had stable structure and good separation performance, and had broad application prospects in pervaporation of organic solvent dehydration.

Key words: MXene, Ti₃C₂T _x nanosheet, α-Al₂O₃ carrier tube, pervaporation, isopropanol, separation

摘要：

二维过渡金属碳（氮）化合物MXene（Ti₃C₂T _x ）因其亲水性且层间距可调在膜分离领域得到了广泛关注，但层流状MXene膜易从基底上剥离，因而选取合适的基底材料并增加MXene膜与基底材料的黏附性是其工业应用的关键。以大孔α-Al₂O₃陶瓷管为载体，采用α-Al₂O₃颗粒和SiO₂-ZrO₂溶胶对其进行修饰，通过自交联反应制备得到MXene渗透汽化分离膜材料。探究了Ti₃C₂T _x 纳米片负载量、异丙醇浓度、运行温度对MXene膜在异丙醇/水体系中渗透汽化分离性能的影响。结果表明：MXene纳米片形成的层状结构有利于阻隔大直径的异丙醇分子通过层间孔道，当MXene纳米片负载量为1.97mg/cm²时，MXene膜在55℃对质量分数为90%的异丙醇/水溶液表现出较高的脱水性能，其渗透侧含水率为95.51%，通量可达485.13g/(m²·h)。基于大孔α-Al₂O₃载体管的新型MXene膜结构稳定，分离性能良好，在渗透汽化有机溶剂脱水方面具有广阔的应用前景。

关键词: 二维过渡金属碳（氮）化合物, Ti₃C₂T _x 纳米片, α-Al₂O₃载体管, 渗透汽化, 异丙醇, 分离