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将锐钛矿TiO_2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TiO_2改性PVDF膜,并对复合膜的结构进行了表征,研究了TiO_2纳米粒子含量对复合膜性能的影响。结果表明,随着TiO_2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(TiO_2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%、TiO_2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,TiO_2/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%。
The anatase TiO 2 nanoparticles were blended into the casting solution and the nano-TiO 2 modified PVDF membrane was prepared by the solution phase transformation separation method. The structure of the composite membrane was characterized. The effects of TiO 2 nanoparticle content on the composite membrane The impact of performance. The results showed that with the increase of the content of TiO 2 nanoparticles, the surface water contact angle of the composite membrane decreased, the hydrophilicity increased, the pure water flux increased gradually (TiO 2 concentration <8%), the adsorption capacity of the composite membrane decreased, Anti-pollution ability. When the concentration of LiC1 (mass fraction) is 2%, the concentration of PEG600 is 2%, the concentration of PVDF is 20% and the concentration of TiO2 is 5% -8%, the pore size of the hybrid membrane is uniform. Load in PVDF membrane skeleton. Compared with the PVDF membrane, the hydrophilicity of the TiO 2 / PVDF composite membrane is enhanced, the adsorption of the protein is reduced, and the anti-pollution ability is enhanced. The composite membrane showed good adsorption-desorption properties for Cu (Ⅱ), and the adsorption rate of Cu (Ⅱ) was 82.19% within 150 min.