陶瓷基中空纤维复合膜的制备及其CO_(2)/N_(2)分离性能  

Preparation of ceramic based hollow fiber composite membrane and its CO_(2)/N_(2)separation performance

作　　者：刘建超 曹东升 张国瑞 张雷 于道明 付维贵[1] 马小华 LIU Jianchao;CAO Dongsheng;ZHANG Guorui;ZHANG Lei;YU Daoming;FU Weigui;MA Xiaohua(School of Materials Science and Engineering,Tiangong University,Tianjin 300387,China)

机构地区：[1]天津工业大学材料科学与工程学院,天津300387

出　　处：《材料工程》2024年第12期171-178,共8页Journal of Materials Engineering

基　　金：国家自然科学基金(22078245)。

摘　　要：膜分离法相比于传统的气体分离方法,具有成本低、易操作、分离效果显著等优点。本工作以耐高温、强度高、通量大的晶须莫来石中空纤维膜(M0)作为支撑层,以黏度可控的PDMS作为中间过渡层,将PDMS涂覆到纤维膜表面并覆盖纤维膜表面的缺陷。通过水热合成法对UiO-66进行氨基修饰,以均苯三甲酰氯为油相单体,胱胺为水相单体进行界面聚合,通过界面聚合将UiO-66-NH_(2)固载到复合膜顶层,从而得到M0-PUi复合膜。通过FT-IR,XRD,SEM和膜表面水接触角等对膜改性前后进行表征测试,并采用自制气体分离装置测试膜对单一气体的渗透通量并计算CO_(2)/N_(2)的分离性能。结果表明:在室温、0.2 MPa的操作压力下,M0-PUi复合膜对CO_(2)的渗透通量高达2765.3 GPU,CO_(2)/N_(2)的分离选择性为3.2;在80℃和120℃条件下分别连续使用6 h,复合膜的CO_(2)/N_(2)的分离选择性稳定在3.2~3.4之间。Compared to traditional gas separation methods,membrane separation technology has advantages in low cost,easy operation,and high separation efficiency.In this study,the whisker mullite hollow fiber membrane(M0)with excellent high-temperature resistance,high strength,and large flux was used as the supporting layer.The PDMS with controllable viscosity was used as the intermediate transition layer.The PDMS coated on the surface of M0 and covered the defects on the substrate.Subsequently,the UiO-66-NH_(2)nanoparticles were modified with amino groups via the hydrothermal method.Trimesoyl chloride was used as the oil-phase monomer,and cysteamine was used as the water-phase monomer for interfacial polymerization.Through this interfacial polymerization process,UiO-66-NH_(2)was loaded on the top layer of the composite membrane to form the M0-PUi composite membrane.The properties of the membrane before and after modification were characterized by FT-IR,XRD,SEM,and water contact angle of the membrane surface.The CO_(2)/N_(2)separation performance of the membrane was tested using a self-made gas separation device.The results show that the CO_(2)permeance of the composite membrane reaches 2765.3 GPU at room-temperature and under 0.2 MPa operating pressure,and its separation selectivity for CO_(2)/N_(2)is 3.2.The stable separation selectivity of the composite membrane for CO_(2)/N_(2)is 3.2-3.4 after continuous use at 80℃or 120℃for 6 h.

关 键 词：晶须莫来石 中空纤维膜 PDMS MOF 界面聚合 CO_(2)/N_(2) 气体分离 渗透性 

分 类 号：TB332[一般工业技术—材料科学与工程]