HE Rujie ,WU Yefan, ZHOU Jian'er, SHI Jijun, YU Ting, PAN Xia, WEI Fei

(University Key Laboratory of Inorganic Membrane in Jiangxi Province, Jingdezehn Ceramic Institute, Jingdezhen 333001)

Abstract:Ceramic microfiltration membranes unmodified and modified with a titanate coupling agent were characterized by hightemperature pyrolysis gas -chromatography and FTIR. The density of hydroxyl groups on the unmodified and modified membranes was monitored by a nonaqueous titration. After modification, the lipophilic degree increased markedly, and the water absorption ability decreased greatly. In a certain pressure range, the water flux of ceramic microfiltration membranes reduced obviously as the hydrophilicity of inner pore walls in the modified membranes decreased. When the hydrophilicity reached a certain value, the water flux of the ceramic microfiltration membranes tended to be zero.

Keywords:hydrophilicity, hydrophobicity, water flux, hydroxyl, titanate coupling agent