纳米二氧化钛和羟甲基纤维素对聚偏氟乙烯 超滤膜结构和性能的影响

利用相分离法制备了聚偏氟乙烯/纳米TiO2/羧甲基纤维素复合微滤膜,通过膜的渗透性能(渗透流量,截留率)和表征测试(电镜扫描,孔隙分析),研究纳米二氧化钛和羧甲基纤维素的添加量对膜性能的影响.结果表明:随着纳米二氧化钛粒子和羟甲基纤维素的添加量的增多,膜表现出不同的微观结构和性能;当纳米粒子的质量分数在2%、羧甲基纤维素的添加质量分数在4%时,复合膜表面均匀分布许多微细孔,表现出最优异的渗透性能.当复合膜中纳米二氧化钛粒子的质量分数超过3%、羧甲基纤维素的质量分数达6%时,复合膜中的纳米粒子出现团聚现象,孔隙率、渗透性能均下降.

Influence of Nano-Sized TiO2 and CMC on Morphologies and Properties of PVDF Ultrafiltration Membrane

Poly(vinylidene fluoride)(PVDF)/nano-sized TiO2/carboxy-methylcellulose (CMC) organic-inorganic composite ultrafiltration membranes were prepared by phase-separating method.The influence of the additive amounts of nano-sized TiO2 and CMC on the properties of organic-inorganic composite membranes were investigated through the methods of SEM, porosity analysis and ultrafiltration experiments. The results showed that the PVDF/TiO2 /CMC composite membranes exhibited differences in morphologies and properties due to nano-sized TiO2 and CMC addition. At 2wt.% TiO2 and 4wt.% CMC, the composite membranes were of uniform microstructure and held excellent water permeability, while the addition of TiO2 over 3 % and CMC to 6 %, nanoparticles of the composite membranes appeared agglomeration, the porosity and ultrafiltration properties would decline.