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为了提高有机高分子材料聚偏氟乙烯(PVDF)超滤膜的亲水性,增强其在污水处理中的抗污染能力,采用无机纳米氧化钛(TiO2)和氧化铝(Al2O3)颗粒对PVDF进行改性,制备(TiO2+Al2O3)/PVDF改性复合超滤膜。为考察无机纳米颗粒对复合超滤膜成膜过程的影响,采用浊点滴定法测定铸膜液体系的分相点,绘制三元相图,以考察纳米颗粒的加入对PVDF超滤膜成膜过程中的热力学影响;采用紫外分光光度计测定铸膜液体系的透光度下降曲线,考察纳米颗粒对PVDF成膜过程中的动力学影响。结果表明:纳米颗粒的加入降低了铸膜液容纳非溶剂的能力,使其在较小的非溶剂浓度下即可固化成膜;纳米颗粒使铸膜液中溶剂与非溶剂双向扩散的传质阻力增加,缩短了铸膜液浸入凝胶浴瞬间至固化成膜的时间。
In order to improve the hydrophilicity of polyvinylidene fluoride (PVDF) ultrafiltration membrane of organic polymers and enhance its anti-pollution ability in sewage treatment, PVDF was prepared by using inorganic nano-titanium oxide (TiO2) and aluminum oxide (Al2O3) Modified, prepared (TiO2 + Al2O3) / PVDF composite modified ultrafiltration membrane. In order to investigate the effect of inorganic nanoparticles on the membrane formation process of composite ultrafiltration membrane, the titration point of the membrane system was determined by turbidimetric titration and the ternary phase diagram was drawn to investigate the effect of the addition of nano-particles on the membrane formation process of PVDF ultrafiltration membrane In the thermodynamic influence; using UV spectrophotometer to measure the transmittance of the cast solution drop curve to investigate the kinetics of nanoparticles during PVDF filming process. The results showed that the addition of nano-particles reduced the ability of the casting solution to contain non-solvent, which could be cured at a relatively low concentration of non-solvent. The nano-particle mass transfer of two-way diffusion of solvent and non- Resistance increases, shortening the casting solution immersed in the gel bath instantly to the curing time into the film.