疏水性FAS-Al_2O_3复合陶瓷膜的制备与表征  

Preparation and Characterization of the Hydrophobic FAS/α-Al_2O_3 Composite Ceramic Membrane

作　　者：唐超[1] 陈志[1] 朱神平 王继尧[1] 李建明[1] 

机构地区：[1]四川大学化学工程学院,四川成都610065

出　　处：《过滤与分离》2016年第3期5-12,共8页Journal of Filtration & Separation

摘　　要：选用1H,1H,2H,2H-全氟癸基三乙基氧硅烷对自制的孔梯度结构氧化铝陶瓷膜表面进行改性,制备疏水性FAS-Al_2O_3氧化铝陶瓷复合膜。通过正交实验和膜表面接触角测试确定改性液浓度、改性时间和改性次数对膜接触角的影响。通过扫描电镜分析(SEM)、孔径及其分布测试、纯水通量以及红外光谱分析测试(IR)对改性前后的氧化铝陶瓷膜理化性质进行表征。对FAS-Al_2O_3复合疏水膜进行NaCl盐溶液的气隙式膜蒸馏实验,考察疏水性FAS-Al_2O_3复合陶瓷膜对NaCl溶液的膜蒸馏通量和对NaCl的截留性能。结果表明:接触角均在130°以上,最大达到156.2°,疏水效果显著;在进料温度为80℃,冷却侧温度为15℃,进料流量为12h/L的实验条件下,对质量分数为2%的NaCl溶液的截留率为98.5%,渗透通量为12.68kg/m2·h。The alumina ceramic membrane surface with diverging pores was modified by the chloroform solution of 1H, 1H,2H, 2H-perfluorodecytriethoxysilane（FAS） to prepare hydrophobic FAS/α-Al2O3 composite membrane. The effects of FAS solution concentration, reaction time and modification times on the contact angle were investigated by orthogonal experiments with contact angle as the test index. The physical and chemical properties of modified and unmodified ceramic membranes were characterized by the SEM analysis, FT-IR analysis, pore size and its distribution measurements. The salt rejection and the permeate flux of FAS/α-Al2O3 composite membrane were investigated by air-gap membrane distillation（AGMD）. The results showed that the contact angles were all above 130°, the maximum reach 156.2° and the hydrophobicity was quite obvious. When the temperature of feed solution was kept at 80°C, the inlet temperature of cooling water was maintained at 15° C and flow rate of cross flow was 12h·L-1in the experiments, the salt rejection was 98.5% and the permeate flux was 12.68kg·m·2·h-1for 2% NaCl solution.

关 键 词：膜蒸馏 FAS 陶瓷膜 改性 

分 类 号：TQ028.8[化学工程]