TiO2 coated on PVDF membrane for dye wastewater treatment by a photocatalytic membrane

摘要： This work investigated the membrane modi?cation to increase hydrophilicity aiming for application in a photocatalytic membrane. The modi?ed poly(vinylidene ?uoride) (PVDF) ?at sheet membrane was coated with titanium dioxide (TiO2). The chemical and physical changes of membranes were characterized by contact angle, SEM and porosity. The results found that TiO2 successfully modi?ed the PVDF membrane by decreasing the contact angle from 127.1° to 114.3° on increasing the TiO2 concentration from 0.1 to 1.0 g/L. The contact angles were decreased with the increase of coating time. The water permeation after PVDF membrane modi?cation decreased compared with the original membrane, whereas water ?uxes increased with the increase of TiO2 concentration. TiO2 particles were observed on the membrane surface while the porosity of the membrane coated with TiO2 decreased. The optimum condition of membrane coating was obtained at 1.0 g/L of TiO2 and 60 min of coating time. The decolorization of RB 19 by photolysis and photolysis followed by ?ltration was less than 10%; in contrast, the decolorization of RB 19 by photocatalytic oxidation was as well as a photocatalytic membrane for 60 min. The TiO2 photocatalytic membrane is a feasible technology for RB 19 decolorization in wastewater.