溶胶-凝胶法制备聚砜/二氧化钛有机-无机杂化超滤膜

采用溶胶-凝胶法制备了不同TiO₂含量的PSF/TiO₂杂化超滤膜, 并通过SEM, XRD TG/DTA, 超滤实验, 机械性能测试, 水接触角测试等手段对膜的结构和性能进行了表征. 结果表明: 当TiO₂的质量分数为9.3%时, 膜亚层的指状孔消失, 形成了以纳米TiO₂颗粒为交联点的网络状孔, 同时膜的亲水性、机械性能和热稳定性都有明显的改善, 并在截留滤基本保持不变的情况下, 水通量明显提高. 但过高的TiO₂含量(w≥11.9%)会产生严重的纳米颗粒团聚现象而造成膜的各项性能指标下降.

Polysulfone/TiO2 Hybrid Ultrafiltration Membrane Prepared by The Sol-Gel Process

Polysulfone (PSF)/TiO₂ hybrid ultrafiltration (UF) membranes with different TiO₂ content were prepared by sol-gel method. The microstructure and the performances of such PSF/TiO₂ membrane were investigated through the methods of SEM, XRD, TG/DTA, contact angle goniometer, UF experiments and mechanical strength tests. The results showed that at w(TiO₂)＝9.3%, the macrovoids of PSF/TiO₂ membranes disappeared, a network structure by bond conjunction between TiO₂ particles and PSF/PVP macromolecules was formed, the hydrophilicity, mechanical strength and thermal stability of the membranes were all improved, and the permeability was increased drastically combining with retention unchanged. However higher TiO₂ content (w≥11.9%) caused a serious nanoparticle aggregation to result in the performance decline of PSF/TiO₂ membranes.