A novel hydrophilic organic-ceramic composite membrane was prepared by low temperature chemical vapor deposition (LTCVD) and free-radical graft polymerization of acrylic acid (AA) onto a porous ceramic membrane. By means of FTIR, SEM, EDS and contact angle measurement, the chemical composition, membrane morphology, elemental distribution and hydrophilicity of the grafting layer were studied. By optimizing the LTCVD and graft polymerization conditions, a selective and permeable membrane for dehydration of alcohol was obtained when LTCVD was performed at 175 ℃ with 5 mL of tetraethyl orthosilicate (TEOS) and AA grafting was carried out in solution of 7.5% AA.

Key words: low temperature chemical vapor deposition, pervaporation, composite membrane, acrylic acid, graft polymerization