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研究了不同比例的混合添加剂PEG600-LiCl、丙酮-LiCl、丙三醇-LiCl和PVP-LiCl对TiO2/PVDF平板超滤膜性能和结构的影响,并利用扫描电子显微镜(SEM)和接触角测量仪表征了复合膜的结构。结果表明,PEG600-LiCl、丙酮-LiCl、丙三醇-LiCl和PVP-LiCl 4种混合添加剂均可以改善膜性能,其中PEG600-LiCl、丙三醇-LiCl、PVP-LiCl 3种混合添加剂加到铸膜液中,明显改善了PVDF膜表面的亲水性,可以将膜表面接触角降低至55°。当PVP与LiCl的质量比为1:2时,膜的性能达到最优,孔隙率为82.5%,平均孔径为0.1μm,水通量为100.5 L.m-2.h-1,截留率为95.4%。
The effects of different proportions of PEG600-LiCl, acetone-LiCl, glycerol-LiCl and PVP-LiCl on the properties and structure of TiO2 / PVDF ultrafiltration membranes were investigated. Scanning electron microscopy (SEM) and contact angle The instrument characterizes the structure of the composite membrane. The results showed that the four kinds of additives such as PEG600-LiCl, acetone-LiCl, glycerol-LiCl and PVP-LiCl could improve the performance of the membrane. Among them, PEG600-LiCl, glycerol-LiCl and PVP-LiCl mixed additives Casting solution significantly improves the hydrophilicity of the PVDF membrane surface and reduces the contact angle of the membrane surface to 55 °. When the mass ratio of PVP to LiCl is 1: 2, the performance of the membrane is optimized, the porosity is 82.5%, the average pore size is 0.1 μm, the water flux is 100.5 Lm-2.h-1, the rejection is 95.4% .