N掺杂TiO_2陶瓷膜的制备及其光催化性能研究

Preparation of N-doped TiO_2 ceramic membrane and its photocatalytic properties

采用溶胶-凝胶法制备N掺杂TiO2溶胶,用浸渍-提拉方法将溶胶涂敷在陶瓷膜表面,制备具有抗污染性能的光催化陶瓷膜。光催化与膜分离技术相结合,处理含盐直接耐酸大红4BS染料废水,考察了料液pH值、初始浓度、跨膜压差、膜面流速等因素对含盐染料废水处理效果的影响。结果表明,该复合陶瓷膜对4BS染料的截留率在99%以上,对无机盐的截留率低于1%,光催化膜分离耦合的膜通量较单一膜分离的通量提高90%。

N-doped TiO2 sol was synthesized by sol-gel method. The sol was coated on an inorganic ceramic membrane by dipping-raise method to make a photocatalytic ceramic membrane with antifouling characteristics. Dye wastewater containing salt （direct fast scarlet dye 4BS） was treated by the combination of photocatalytic technique and membrane separation. Initial concentration, pH, trans-membrane pressure and cross-flow veloci- ty on treatment effect of the dye wastewater was investigated. The results showed that the rate of rejection was 99% for the dye and less than 1% for inorganic salt in composite ceramic membrane. The permeate flux of the composite membrane was increased by 90 % in irradiation, without irradiation. compared with the processes of membrane separation