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采用相转化法将聚偏氟乙烯(PVDF)、二氧化钛(TiO2)和聚乙二醇(PEG)共混制得TiO2光催化有机-无机杂化超滤膜。利用实验室自制有机-无机杂化超滤膜在有无紫外光照条件下,对腐殖酸(HA)和水库源水样中天然有机物(NOM)的去除率和膜污染情况进行研究和分析,并比较了不同溶液环境(pH和离子强度)和有无紫外光照条件下对腐殖酸水样超滤过程的影响。结果表明,pH较低、离子强度较高的溶液环境有助于提高PVDF-PEG-TiO2膜对HA的去除率;光催化作用可以显著减少膜通量衰减,减少膜污染。
TiO2 photocatalytic organic-inorganic hybrid ultrafiltration membrane was prepared by the phase inversion method using polyvinylidene fluoride (PVDF), titanium dioxide (TiO2) and polyethylene glycol (PEG). The removal efficiency and membrane fouling of humic acid (HA) and natural organic matter (NOM) in reservoir water samples were studied and analyzed by using laboratory-made organic-inorganic hybrid ultrafiltration membranes in the presence of UV light. The effects of different solution environments (pH and ionic strength) and UV irradiation on the ultrafiltration process of humic acid were also compared. The results show that the solution environment with lower pH and higher ionic strength can help to improve the removal rate of HA by PVDF-PEG-TiO2 membrane. Photocatalytic activity can significantly reduce membrane flux attenuation and reduce membrane fouling.