A low-cost alumina-mullite composite hollow fiber ceramic membrane fabricated via phase-inversion and sintering method

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• 作者：Lingling Li^a ; ^b ; ^c ; Mingliang Chen^a ; ^b ; Yingchao Dong^a ; ^b ; ^{ycdong@iue.ac.cn" class="auth_mail" title="E-mail the corresponding author} ; ^{dongyc9@mail.ustc.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Xinfa Dong^c ; Sophie Cerneaux^d ; Stuart Hampshire^e ; Jingjie Cao^a ; ^b ; ^c ; Li Zhu^a ; ^b ; Zhiwen Zhu^a ; ^b ; Jing Liu^a ; ^b ; ^c
• 关键词：Hollow fiber membrane ; Ceramic membrane ; Alumina-mullite ; Phase inversion ; Weibull modulus ; Active surface hydroxyl site
• 刊名：Journal of the European Ceramic Society
• 出版年：2016
• 出版时间：July 2016
• 年：2016
• 卷：36
• 期：8
• 页码：2057-2066
• 全文大小：3490 K

文摘

With abundant bauxite mineral as starting material, a low-cost alumina-mullite composite hollow fiber ceramic membrane (HFCM) was fabricated via phase-inversion method followed by high temperature sintering. Process parameters, including bore fluid flow rate and air-gap distance, which affect structure and properties of the HFCM were systematically explored. A low bore fluid flow rate would lead to the deformation of inner walls of the HFCM as a result of insufficient solidification, while a large air-gap distance would induce the distortion of finger-like voids. Effects of sintering on the microstructure, pore size distribution, nitrogen gas flux and mechanical properties were investigated in details. Acid-base titration was first proposed to quantitatively determine concentration of surface active sites of membrane surface after sintering. An increase in sintering temperature leads to significantly enhancing strength but almost linearly reduces concentration of active surface hydroxyl sites. Compared with its alumina counterpart, this low-cost composite membrane can be sintered at lower sintering temperature, and exhibits higher mechanical strength and active surface hydroxyl site concentration.