Preparation and Characterization of Alumina Membranes on Capillary Supports:Effect of Film-coating on Crack-free Membrane Preparation

›› 2010, Vol. 18 ›› Issue (3): 377-383.

• SEPARATION SCIENCE AND ENGINEERING • Previous Articles Next Articles

Preparation and Characterization of Alumina Membranes on Capillary Supports:Effect of Film-coating on Crack-free Membrane Preparation

ZHU Jin, FAN Yiqun, XU Nanping

State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemistry and Chemical Engineering, Nanjing University of Technology, Nanjing 210009, China

Received:2009-10-26 Revised:2010-03-31 Online:2010-06-28 Published:2010-06-28
Supported by:
Supported by the National High Technology Research and Development Program of China(2007AA030303);the National Basic Research Program of China(2009CB623400);the National Natural Science Foundation of China(20776067)

Preparation and Characterization of Alumina Membranes on Capillary Supports:Effect of Film-coating on Crack-free Membrane Preparation

朱瑾, 范益群, 徐南平

State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemistry and Chemical Engineering, Nanjing University of Technology, Nanjing 210009, China

通讯作者: FAN Yiqun,E-mail:yiqunfan@njut.edu.cn
基金资助:
Supported by the National High Technology Research and Development Program of China(2007AA030303);the National Basic Research Program of China(2009CB623400);the National Natural Science Foundation of China(20776067)

Abstract

Abstract: Ceramic capillary membrane has received much attention due to its relatively high pack density and favorable mechanical strength.However,it is difficult to prepare capillary membrane on its thin support by a dip-coating method.In this study,alumina microfiltration membranes were prepared on the inner surface of alumina capillary support(outer diameter 4 mm,inner diameter 2.5 mm)by a dip-coating method.Scanning electron microscopy(SEM)observation,gas bubble pressure(GBP)method and membrane permeation test were carried out to evaluate membrane performance.Two major effects in preparation of crack-free membrane,capillary filtration and film-coating,upon the thin support were studied.The as-prepared crack-free membrane presents a narrow pore size distribution,a mean pore size of about 0.6μm and a high pure water flux of 86000 L·m^-2·h^-1·MPa.It is proved that the membrane thickness should be sufficiently large to overcome the defects of support surface,but it is only one of the prerequisites for the formation of crack-free membrane.Furthermore,it is demonstrated that the capillary filtration effect is greatly restricted for thin capillary support with the dip-coating method and the film-coating effect plays a crucial role in the formation of crack-free membrane.

Key words: capillary, film coating, dip-coating, ceramic membrane

摘要： Ceramic capillary membrane has received much attention due to its relatively high pack density and favorable mechanical strength.However,it is difficult to prepare capillary membrane on its thin support by a dip-coating method.In this study,alumina microfiltration membranes were prepared on the inner surface of alumina capillary support(outer diameter 4 mm,inner diameter 2.5 mm)by a dip-coating method.Scanning electron microscopy(SEM)observation,gas bubble pressure(GBP)method and membrane permeation test were carried out to evaluate membrane performance.Two major effects in preparation of crack-free membrane,capillary filtration and film-coating,upon the thin support were studied.The as-prepared crack-free membrane presents a narrow pore size distribution,a mean pore size of about 0.6μm and a high pure water flux of 86000 L·m^-2·h^-1·MPa.It is proved that the membrane thickness should be sufficiently large to overcome the defects of support surface,but it is only one of the prerequisites for the formation of crack-free membrane.Furthermore,it is demonstrated that the capillary filtration effect is greatly restricted for thin capillary support with the dip-coating method and the film-coating effect plays a crucial role in the formation of crack-free membrane.

关键词: capillary, film coating, dip-coating, ceramic membrane

ZHU Jin, FAN Yiqun, XU Nanping. Preparation and Characterization of Alumina Membranes on Capillary Supports:Effect of Film-coating on Crack-free Membrane Preparation[J]. , 2010, 18(3): 377-383.

朱瑾, 范益群, 徐南平. Preparation and Characterization of Alumina Membranes on Capillary Supports:Effect of Film-coating on Crack-free Membrane Preparation[J]. , 2010, 18(3): 377-383.

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Preparation and Characterization of Alumina Membranes on Capillary Supports:Effect of Film-coating on Crack-free Membrane Preparation

Preparation and Characterization of Alumina Membranes on Capillary Supports:Effect of Film-coating on Crack-free Membrane Preparation

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