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目的提高陶瓷膜对水包油乳化液的分离能力。方法将纤维素粉末充分溶解在氢氧化钠、尿素、水配制的溶解液中,低温真空下在多孔陶瓷分离膜表面构筑亲水性纤维素涂层。通过X射线衍射仪(XRD)、场发射扫描电子显微镜(SEM)、接触角测量仪、紫外-可见分光光度计表征纤维素/陶瓷复合膜的组成、结构、表面润湿性及水包油(甲苯)乳液分离效率。结果纤维素成功复合到多孔陶瓷膜孔隙表面,空气中水滴在膜表面的接触角为0°,水中油滴的接触角高达155°左右,使多孔陶瓷膜具备了在空气中超亲水-水下超疏油的特性。通过油水分离实验发现,在常温常压下,多孔陶瓷膜对水包甲苯乳液高效分离,其油水分离能力(>99.26%)、抗污染性(经20次循环分离后,三种复合的平板陶瓷膜的水通量变化不大)得到显著提高,表现出较好的油水分离性能。结论陶瓷分离膜经纤维素修饰后,表面亲水性和水下超疏油性都得到了提高,油水分离能力可达99.26%,重复使用20次的纯水通量无明显衰减。
Objective To improve the separation ability of ceramic membrane to oil-in-water emulsion. Methods The cellulose powder was fully dissolved in the solution of sodium hydroxide, urea and water, and the hydrophilic cellulose coating was formed on the surface of porous ceramic separation membrane under low temperature and vacuum. The composition, structure, surface wettability and oil-in-water of oil-in-water (oil-in-water) composite membranes were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (SEM), contact angle measurement and UV-visible spectrophotometer Toluene) emulsion separation efficiency. Results Cellulose successfully complexed to the porous ceramic membrane pore surface, the air contact angle of the water drop on the membrane surface is 0 °, the contact angle of water droplets up to 155 °, so that the porous ceramic membrane with a super-hydrophilic in the air - underwater Super oleophobic properties. Through the oil-water separation experiment, it was found that the porous ceramic membrane can effectively separate the water-in-toluene emulsion under the normal temperature and pressure, with the oil-water separation ability (> 99.26%) and the anti-contamination Membrane water flux little change) has been significantly improved, showing better oil-water separation performance. Conclusions After the cellulose membrane was modified by cellulose, the surface hydrophilicity and superhydrophobicity of the ceramic separation membrane were improved. The separation ability of oil and water was up to 99.26%, and the pure water flux of repeated use for 20 times had no obvious decay.