LTA型分子筛@地质聚合物复合自支撑膜的制备及醇水分离应用研究  

Study on the preparation of LTA-type zeolite@geopolymer composite self-supporting membranes and application for ethanol-water separation

作　　者：晋媛 马楠柯 JIN Yuan;MA Nanke(Hunan Key Laboratory of Biomedical Nanomaterials and Devices,Hunan University of Technology,Zhuzhou 412007,China)

机构地区：[1]湖南工业大学湖南省生物医用纳米材料与器件重点实验室,湖南株洲412007

出　　处：《湘潭大学学报（自然科学版）》2023年第1期98-106,共9页Journal of Xiangtan University(Natural Science Edition)

基　　金：湖南省自然科学基金项目(2020JJ6066);湖南省教育厅一般项目(20C0621);株洲市2020社会发展成果转化专项项目(202033)。

摘　　要：该文通过碱诱导聚合Al_(2)O_(3)-2SiO_(2)活性粉体得到片状地质聚合物,然后通过原位水热转化/凝胶合成法得到了LTA型分子筛@地质聚合物复合自支撑膜.采用扫描电子显微镜(SEM)、X射线衍射仪(XRD)、万能试验机及渗透汽化测试考察合成方法对复合自支撑膜的表面形貌、晶型、抗压强度及醇水分离性能的影响,并进一步研究渗透汽化温度对复合自支撑膜醇水分离性能的影响.结果表明,将地质聚合物直接置于100℃凝胶合成液中合成4 h,可以得到较为致密的LTA型分子筛@地质聚合物复合自支撑膜.该复合自支撑膜对渗透温度较为敏感,在30℃下展现出良好的渗透汽化醇水分离性能,分离90%乙醇/水溶液的分离因子为2023,通量为0.78 kg/(m^(2)·h).简单的制备方法为LTA型自支撑分子筛膜的工业化放大生产提供了可能的路径,并为应用地质聚合物合成其他类型的分子筛膜提供了良好的借鉴.In this study,geopolymer was obtained by alkali-induced polymerization of Al_(2)O_(3)-2SiO_(2)powder,and LTA-type zeolite@geopolymer composite self-supporting membranes were obtained by in-situ hydrothermal conversion/gel synthesis method.SEM,XRD,universal tester and pervaporation test were adopted to study the influence of the synthesis method on the surface morphology,crystalline phases,compressive strength and pervaporation performance of these composite self-supporting membranes.Moreover,the influence of pervaporation temperature on the separation performance was further investigated.It showed that the dense LTA-type zeolite@geopolymer composite self-supporting membrane could be obtained by placing geopolymer directly in the gel synthesis solution at 100℃for 4 h.These composite self-supporting membranes were very sensitive to the pervaporation temperature.It showed good pervaporation performance for 90%ethanol/aqueous solution at 30℃,namely,the separation factor was 2023 and the flux was 0.78 kg/(m^(2)·h).The simple preparation method provided a possible path for industrial scale production of LTA-type self-supporting zeolite membranes,and provided a good reference for the synthesis of other types of zeolite membranes by geopolymer.

关 键 词：地质聚合物 自支撑 LIA型分子筛膜 渗透汽化 醇水分离 

分 类 号：TQ319[化学工程—高聚物工业]