采用紫外接枝法增加PVDF膜的亲水性,以聚甲基丙烯酸聚乙二醇酯(pOEGMA)为主要改性材料。通过紫外光照射引发和聚合,使pOEGMA接枝到PVDF膜上。从红外谱图和X射线光电子能谱可以看出pOEGMA接枝在PVDF滤膜上。改性之后的PVDF膜对乳化油的分离效率增加,通量有所降低。随着油含量(D5)的增加,分离效率变差。在重复使用性测试过程中,发现使用D5/水乳液行测试时,膜的抗污染性优异,分离效率和通量略微上升,分离效率第五次高达99.9%。对实际的染色废水分离时,由于膜膜的表面沾污污染物,容易堵塞孔道,通量下降非常快,但没有对油的截留产生影响,对油的过滤效率依旧高达99%,明显降低了化学需氧量(COD)和浊度。
The hydrophilicity of PVDF membrane was improved through grafting polyethylene glycol methacrylate (pOEGMA) on PVDF membrane under UV irradiation.FT-IR and XPS spectrogram showed that pOEGMA was successfully grafted on PVDF filter membrane.The separation efficiency of the modified PVDF membrane for emulsified oil increased,while the flux decreased.With the increase of oil content,the separation efficiency got worse.During reusability test of D5/water emulsion test,the membrane presented good antifouling performance.Separation efficiency and flux was increased slightly.The fifth separation efficiency reached 99.9%.When separating the actual dyeing wastewater,because the surface of the membrane was contaminated with pollutants,pores were easily blocked,and the flux decreased very fast,but it had no impact on the interception of oil.The filtration efficiency of oil was still as high as 99%,and COD and turbidity were significantly reduced.
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基金资助
国家自然科学基金(22072089);“十三五”重点研发项目(2017YFB0309600);新疆生产建设兵团重大科技项目(2019AAA001);上海工程技术大学研究生科研创新项目(20KY0908)
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