二氧化钛/聚酰胺正渗透复合膜的制备与表征

以钛酸四丁酯为原料,在水/丁醇界面区进行水解,制备了锐钛矿型二氧化钛。将TiO2分别分散在水相(MPD溶液)和油相(TMC溶液)中,以界面聚合方法制备了TiO2/聚酰胺正渗透复合膜,初步研究了TiO2分散在油相和水相中制备的二氧化钛/聚酰胺复合膜的结构及其在正渗透过程中分离性能。SEM图谱结果表明,TiO2添加到水相中时,其主要存在于聚砜基膜的指状孔道中;当TiO2添加到油相中时,其主要分布在复合膜表面。膜分离性能的研究结果表明,TiO2添加在水相和油相中都能显著提高膜的水通量和截盐率;TiO2添加在油相中对膜的分离性能改进更大,膜的水通量为未添加TiO2聚酰胺复合膜的两倍,截盐率可达99.9%。

PREPARATION AND CHARACTERIZATION OF TiO2/ POLYAMIDE NANOCOMPOSITE FORWARD 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 was compact and exhibited the familiar "peak and valley".The TFN membranes with TiO2 added in the TMC organic phase had presented better forward osmosis performance than which with TiO2 added in MPD aqueous solution.