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选取氧化铝分散体(Al2O3)、Linde A型沸石(LTA)、Linde L型沸石(LTL)和X型八面沸石(FAU-X)4种纳米颗粒,采用原位植入的方法对超滤膜进行表面改性,以提高聚砜超滤膜的抗生物污染性能.通过扫描电子显微镜、接触角测定、抗生物污染性能测试等方法来表征改性前后膜结构和性能的变化.结果表明,纳米颗粒在膜表面的原位植入具有其可行性,该方法只改变超滤膜的表面形貌,对断面和底面的结构没有影响;纳米颗粒原位植入法改性后,超滤膜的亲水性有显著提高.就抗生物污染性能而言,纳米颗粒的植入提高了膜的抗粘附性能,在纳米颗粒覆盖的区域没有大肠杆菌粘附生长;在这4种膜中,UF-LTA和UF-LTL膜的抗粘附性能优于UF-Al2O3和UF-FAU-X膜.相较而言,LTA型沸石在膜表面分散效果良好,原位植入后显著改善了膜的亲水性并且表现出较好的抗粘附性能,可作为理想的材料用于下一步研究.但LTA型沸石的抗水流剪切的能力较弱,要想提高该种纳米颗粒在膜表面的结合牢固性,应考虑减小颗粒的粒径.
Four kinds of nanoparticles, alumina (Al 2 O 3), Linde A zeolite (LTA), Linde L zeolite (LTL) and X-type faujasite zeolite (FAU-X) Membrane surface modification to improve the biofouling performance of polysulfone ultrafiltration membrane.The changes of membrane structure and properties before and after modification were characterized by scanning electron microscopy, contact angle measurement and anti-biofouling performance test.The results showed that, The in situ implantation of nanoparticles on the membrane surface has its feasibility, this method only changes the surface morphology of the ultrafiltration membrane, and has no effect on the structure of the cross section and the bottom surface. After the nanoparticles are in situ modified, the ultrafiltration membrane In terms of anti-biofouling performance, the nanoparticle implants increased the anti-adhesion properties of the membrane, and no E. coli adhesion growth was observed in the area covered by the nanoparticles. Among the four membranes, The anti-adhesive properties of UF-LTA and UF-LTL films are better than that of UF-Al2O3 and UF-FAU-X films.LTA-type zeolites disperse well on the surface of the films, Hydrophilicity and shows better anti-adhesion properties, which can be used as the ideal material for the next step But resistance to shear flow of the LTA type zeolite is weak, in order to improve this kind of nanoparticles of the film surface with a solid, particle size reduction should be considered.