纳米TiO2共混改性PVDF复合膜的制备和性能

将锐钛矿TiO₂纳米颗粒共混于铸膜液中,用溶致相转换分离法制备了纳米TiO₂改性PVDF膜,并对复合膜的结构进行了表征,研究了TiO₂纳米粒子含量对复合膜性能的影响。结果表明,随着TiO₂纳米粒子含量的增加,复合膜的表面水接触角降低、亲水性提高,纯水通量逐渐增加（TiO₂浓度<8%）,复合膜对于蛋白质吸附量降低、膜的抗污染能力提高。当LiC1的浓度（质量分数,下同）为2%、PEG600的浓度为2%、PVDF的浓度为20%、TiO₂的浓度为5%-8%时,杂化膜的孔径大小均匀,TiO2颗粒负载于PVDF膜的骨架中。与PVDF膜比较,TiO₂/PVDF复合膜的亲水性提高、对蛋白质的吸附降低、抗污染能力增强。此复合膜对Cu（Ⅱ）表现出良好的吸附-脱附性能,在150 min内对Cu（Ⅱ）的吸附率为82.19%。

Synthesis and Properties of TiO2/PVDF Hybrid Membrane

The hybrid membrane was prepared through reversed phase cast method by blending the anatase-TiO₂ nanoparticles with the PVDF casting solutions.The metallographic microscope,scanning electron microscope（SEM） and Fourier transform infrared spectroscopy（FTIR） were used to character the hybrid films,and the effects of TiO₂ nanoparticle content on the properties of the TiO₂/PVDF hybrid membraine were investigated.The results showed that a promoted adsorption and elution efficiencies of PVDF/TiO₂ hybrid membranes were observed compared with that of the neat PVDF film.And with increase of TiO₂ nanoparticle content,the surface water contact angle of the hybrid membraine decreases, the hydrophily,pure water flux（TiO₂ nanoparticle content<8%） and the contamination resistance increase. The optimum conditions were determined as follows:w（LiCI）=2%,w（PEG600）=2%,w（PVDF）=20%and w（TiO₂）=5%-8%.