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MXene/rGO中空纤维复合膜的构建及气体分离性能

作者：包焕忠，乔俊豪，王钦圣，王玉明，曹国强，于庆华，李嵩，张连宝，靳昀

单位： 1.淄博蓝景膜环保科技有限公司，淄博 255400；2.山东理工大学化学化工学院，淄博255049；3.山东美陵中联环境工程有限公司，淄博 255400

关键词： MXene/rGO；膜分离；层间距；气体分离；渗透性

DOI号：

分类号： TQ028.2+1

出版年,卷(期):页码： 2023,43(5):118-126

摘要：

通过聚二烯丙基二甲基氯化铵（PDDA）对rGO表面进行修饰，表面带有正电荷的柔性rGO纳米片插层带有负电的MXene纳米片之间以调控层间距，形成排列良好的交替有序2D-2D复合结构，采用真空辅助抽滤法在Al2O3中空纤维沉积制备中空纤维MXene/rGO复合膜。采用扫描电子显微镜（SEM）对MXene/rGO复合膜进行表面微观形貌分析，通过X 射线衍射仪（XRD）和X 射线衍射光电子能谱仪（XPS）进行层间距、化学晶型分析和元素价态分析，对膜结构和表面的带电性及气体渗透性进行测试。结果表明：表面带有正电荷的rGO作为插层材料，可调控MXene纳米片层间距至3.15Å，介于H2（2.89 Å）和CO2（3.30 Å）分子动力学直径之间，从而提高MXene/rGO复合膜的分离性能。25 oC时，MXene/rGO复合膜的H2渗透性为5.13×10-8 mol/(m2·s·Pa)，H2/CO2选择性为125。同时经过200 h的膜稳定性测试，MXene/rGO复合膜表现出优秀的稳定性。

MXene/rGO composite membranes were prepared through rGO modified by polyallyl dimethyl ammonium chloride (PDDA) inserted into the MXene nano-sheet with negative charge to inhibit the self-stacking of MXene. Scanning electron microscopy (SEM) was used to analyze the surface morphology of MXene/rGO composite membranes. X-ray diffraction (XRD) and X-ray diffraction photoelectron spectroscopy (XPS) were used to analyze the layer spacing, chemical crystal pattern and valence state of elements. The results show that MXene/rGO can achieve inter-spacing of 3.15 Å through intercalating regulation. Moreover, MXene/rGO composite hollow fiber membranes show excellent H2 permeability of 5.13×10-8 mol/(m2·s·Pa), H2/CO2 selectivity of 125 at 25 oC, and excellent stability over 200 h.

基金项目：

国家自然科学基金（21878179）；山东省重大科技创新工程项目（2019JZZY020224）

作者简介：

包焕忠（1970-），男，吉林省梅河口市人，高级工程师，学士，研究方向为分离膜的研发、应用和制备，E-mail：bhz@mayling.com.cn

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