Chen Zhuwen, Zeng Jiaying, Lv Dong, Gao Jinqiang, Zhang Jian, Bai Shan, Li Ruili, Hong Mei, Wu Jingshen
Guangdong Provincial Key Laboratory of Nano-Micro Materials Research, School of Chemical Biology and Biotechnology , Peking University Shenzhen Graduate School , Shenzhen 518055 , People's Republic of China.
Department of Mechanical and Aerospace Engineering , The Hong Kong University of Science and Technology , Clear Water Bay, Hong Kong SAR , People's Republic of China.
R Soc Open Sci. 2016 Dec 21;3(12):160552. doi: 10.1098/rsos.160552. eCollection 2016 Dec.
Some key parameters of supports such as porosity, pore shape and size are of great importance for fabrication and performance of zeolite membranes. In this study, we fabricated millimetre-thick, self-standing electrospun ceramic nanofibre mats and employed them as a novel support for zeolite membranes. The nanofibre mats were prepared by electrospinning a halloysite nanotubes/polyvinyl pyrrolidone composite followed by a programmed sintering process. The interwoven nanofibre mats possess up to 80% porosity, narrow pore size distribution, low pore tortuosity and highly interconnected pore structure. Compared with the commercial α-AlO supports prepared by powder compaction and sintering, the halloysite nanotube-based mats (HNMs) show higher flux, better adsorption of zeolite seeds, adhesion of zeolite membranes and lower Al leaching. Four types of zeolite membranes supported on HNMs have been successfully synthesized with either crystallization or a secondary growth method, demonstrating good universality of HNMs for supporting zeolite membranes.
载体的一些关键参数，如孔隙率、孔形状和尺寸，对于沸石膜的制备和性能至关重要。在本研究中，我们制备了毫米厚的自支撑电纺陶瓷纳米纤维垫，并将其用作沸石膜的新型载体。通过对埃洛石纳米管/聚乙烯吡咯烷酮复合材料进行电纺，然后进行程序烧结工艺来制备纳米纤维垫。交织的纳米纤维垫具有高达80%的孔隙率、窄的孔径分布、低的孔曲折度和高度互连的孔结构。与通过粉末压实和烧结制备的商用α-AlO载体相比，基于埃洛石纳米管的垫子（HNMs）表现出更高的通量、对沸石晶种更好的吸附、对沸石膜更好的附着力以及更低的铝浸出。通过晶化或二次生长方法已成功合成了四种负载在HNMs上的沸石膜，证明了HNMs对支撑沸石膜具有良好的通用性。
