TiO2/聚酰胺反渗透复合膜的制备及表征

以钛酸四丁酯为原料,在水/丁醇界面区进行水解,制备了锐钛矿型TiO2。分别将不同量的TiO2分散在水相或油相中,以界面聚合方法制备了TiO2/聚酰胺反渗透复合膜,研究了TiO2含量对所制备复合膜结构和分离性能的影响。SEM图谱结果表明,当TiO2添加到水相中时,其同时存在于聚酰胺复合膜皮层的底层以及聚砜基膜的指状孔道中;当TiO2添加到油相中时,复合膜表面结构致密,峰谷结构明显,可看到在膜皮层的表面有TiO2存在。膜分离性能的研究结果表明,与TiO2添加在水相中相比,TiO2添加在油相中能更好地提高膜分离性能。膜抑菌性能研究表明TiO2/聚酰胺反渗透膜在紫外光照下对大肠杆菌表现出良好的杀灭性能。

Preparation and characterization of TiO2/polyamide nanocomposite reverse osmosis membrane

Titanium dioxide(TiO2) particles composed of anatase,were prepared by a hydrolytic method at interface of butanol and water from trabutoxytitanium.The polyamide thin film nanocomposite(TFN) membranes were formed on the top of polysulfone ultrafiltration membranes by interfacial polymerization in the presence of TiO2 either in trimesoyl chloride(TMC)/n-hexane solution or in m-phenylenediamine(MPD) aqueous solution.The structure and performance of the new TFN membranes loaded with TiO2 were characterized by standard protocols.According to SEM morphologies,the TiO2 particles were found in the bottom of skin layer and finger-like pore of polysulfone support layer when they were added in MPD aqueous solution.When the TiO2 particles were added in TMC/n-hexane solution,the surface morphology of the TFN membranes is compact and exhibits the familiar "peak and valley" and TiO2 particles are visible on the membrane surface.The TFN membraness with TiO2 added in the TMC organic phase had presented better performance than which with TiO2 added in MPD aqueous solution.The antibacterial experimental had revealed that the hybrid TFN membranes loaded with TiO2 possess excellent bactericidal effect on escherchia coli(E.coli) under UV light irradiation.