基于α-Al2O3载体管的新型MXene膜异丙醇脱水性能

doi:10.16085/j.issn.1000-6613.2022-2065

摘要/Abstract

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

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

中图分类号:

TQ028

张国春, 周志辉, 吴红丹. 基于α-Al₂O₃载体管的新型MXene膜异丙醇脱水性能[J]. 化工进展, 2023, 42(10): 5381-5389.

ZHANG Guochun, ZHOU Zhihui, WU Hongdan. Isopropanol dehydration performance of a novel MXene membrane based on a α-Al₂O₃ carrier tube[J]. Chemical Industry and Engineering Progress, 2023, 42(10): 5381-5389.

图/表 14

图1 MXene膜自交联反应示意图

图2 膜层示意图

表1 不同MXene负载量

项目	抽吸时间/min	负载量/mg·cm^-2
M1	10	0.98
M2	15	1.48
M3	20	1.97
M4	25	2.46
M5	30	2.95

图3 MXene纳米片的表征

图4 Mxene纳米片的XPS图

图5 SEM图像

图6 MXene膜表面的EDS谱图

图7 MXene膜的水接触角

图8 不同负载量的MXene膜的渗透汽化性能

图9 不同负载量的MXene膜表面与其对应截面

图10 MXene膜对不同异丙醇含水率的渗透汽化性能及溶胀度测试

图11 MXene膜在不同评价温度下的渗透汽化性能及膜材料的Arrhenius曲线

图12 MXene膜的长期稳定性测试

图13 渗透汽化性能测试前后的MXene膜表面SEM图

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基于α-Al₂O₃载体管的新型MXene膜异丙醇脱水性能

Isopropanol dehydration performance of a novel MXene membrane based on a α-Al₂O₃ carrier tube

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