摘要
采用等温氮吸附、毛细孔凝聚和液体渗透以及截留分子量等方法表征溶胶凝胶法制备的γ－Al2O3纳滤膜的孔结构、活性孔径及其分布、纯水渗透率和截留分子量等膜结构和性能结果表明：在典型情况下，γ－Al2O3顶层纳滤膜为孔径3～5nm，孔径分布窄，膜层平整，平均粗糙度为2．2nm活性孔半径为3～5nm，顶层厚度为2－3.5μm的不对称膜，室温时的H2渗透率达0.1cm3（m2·s·Pa）-1量级；10～20℃、压差△P为0．20MPa时的纯水渗透率为1cm3（m2·s）-1；活性孔半径为3．0、4．8和7.4nm的膜，其分离率为90％的截留分子量分别为2×103、4×103和2×104，符合实用的纳滤股要求气体渗透性表征表明，本工作已成功制备了大面积完整。
Microstructure and permeability of nanofiltration γ-Al2O3 membranes were characterized by means of isothermal nitrogen adsorption-desorption(BET), capillary condensation, gas and liquid difFusion, and molecular weight cut-off. It was shown that the top γ-Al2O3 layer of the asymmetric γ-Al2O3/ α-Al2O3 membrane had a narrow pore size distribution with pore diameter of 3 ～sum. Hydrogen permeability for membrane with Kelvin pore radius of 3 ～ 5nm and 2 ～ 3.5μmthick was at the magnitude of 0.1cm3(m2.s.Pa)-1 and pure water flux 1cm3(m2 .s)-1 at pressure of 0.2MPa. Molecular cut-ofF for membrane with Kelvin pore radius of 3.0, 4.8 and 7.4nm were 2 ×103,4×103 and 2×104 respectively. All these together with gas permeability experiments showed that fine nanofiltration membrane without surface defects had been successfully prepared.
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
1998年第2期133-138,共6页
Chinese Journal of Materials Research
基金
国家自然科学基金!29170025
关键词
无机膜
多孔胸瓷膜
纳滤膜
三氧化二铝
透过性能
inorganic membrane,porous membrane,membrane characterization ,permeability
