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γ-Al2O3中孔陶瓷膜的制备及表征
引用本文:漆虹,邢卫红,范益群.γ-Al2O3中孔陶瓷膜的制备及表征[J].化工学报,2009,60(10):2628-2632.
作者姓名:漆虹  邢卫红  范益群
作者单位:南京工业大学膜科学技术研究所,材料化学工程国家重点实验室
摘    要:以粒径为0.3~0.4 μm的α-Al2O3为原料,通过悬浮液真空抽吸法,制备出平均孔径约为70 nm的完整无缺陷的片状α-Al2O3支撑体;以仲丁醇铝为前驱体,采用颗粒溶胶路线制备出稳定的Boehmite溶胶,以此溶胶采用浸浆法,在制备的α-Al2O3支撑体上制备出完整无缺陷的γ-Al2O3中孔膜,并考察了烧成温度对γ-Al2O3中孔膜性能的影响。结果表明,本文制备出的γ-Al2 O3膜的孔径约为3 nm,对PEG的截留分子量为2800~5300,纯水渗透通量为11.5~25.9 L.m-2.h-1[7.6×105 Pa,(14±1)℃]。说明在孔径为70 nm左右的载体上直接制备孔径为3 nm的完整的中孔膜是可行的。

关 键 词:中孔陶瓷膜  γ-Al2O3  溶胶-凝胶法  
收稿时间:2009-2-13
修稿时间:2009-3-28  

Preparation and characterization of mesoporous γ-Al2O3 membranes
QI Hong,XING Weihong,FAN Yiqun.Preparation and characterization of mesoporous γ-Al2O3 membranes[J].Journal of Chemical Industry and Engineering(China),2009,60(10):2628-2632.
Authors:QI Hong  XING Weihong  FAN Yiqun
Abstract:Starting from alumina with particle size of 0.3—0.4 μm,disk α-Al2O3 supports were prepared via colloidal filtration with a mean pore size of ca.70 nm as determined by Hg intrusion method.The polished supports with mirror-like surface were used for mesoporous membrane preparation.A stable Boehmite sol with a mean particle size of about 20 nm was successfully synthesized with aluminium sec-butoxide(ALSB)as a precursor through particle colloidal sol-gel route.Defect-free γ-Al2O3 mesoporous membranes with pore size of ca.3 nm superimposed on the disk α-Al2O3 supports were then prepared by dip-coating with the Boehmite sol and subsequently calcined in a temperature range of 400—800℃The molecular weight cut-off(MWCO)for PEG and the flux for pure water of these membranes are 2800—5300 and 11.5—25.9 L.m-2.h-1[7.6×105 Pa,(14±1)℃],respectively,which confirms the integrity of the mesoporous membranesThe results presented in this paper provide a feasible method for the preparation of defect free mesoporous membranes with a pore size of about 3 nm directly by coating onto macroporous Al2O3 support with a pore size of about 70 nm.
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