PVDF/TiO_(2)电纺纤维膜在光降解和油水分离方面的应用

Application of PVDF/TiO_(2) Electrospun Fiber Membrane in Photodegradation and Oil-Water Separation

通过将聚偏氟乙烯(PVDF)和钛酸四丁脂(TBOT)溶解在N,N’-二甲基甲酰胺(DMF)和丙酮的混合溶剂中电纺成纤维膜(PVDF/TBOT);然后在150℃下通过一步水热法将电纺纤维膜中的TBOT还原成二氧化钛(TiO_(2)),制得在纤维表面和内部原位生长有TiO_(2)的PVDF纤维膜材料(PVDF/TiO_(2))。采用扫描电子显微镜(SEM)、热重(TG)分析仪、X射线衍射(XRD)仪和傅里叶红外(FT-IR)光谱仪测定原位生长在PVDF纤维上的TiO_(2)的形貌和结构;通过紫外-可见分光光谱测试复合膜对罗丹明B、甲基橙、亚甲基蓝3种有机染料的降解效果;采用重力驱动的方法分离油水混合物;通过测试复合膜对水和油的接触角来探究复合膜的油水分离效率。研究表明:复合膜对罗丹明B、甲基橙、亚甲基蓝等有机染料都有很好的降解效果,而且具有良好的亲油疏水性能,通过对四氯甲烷和水的混合物进行分离,复合膜能够有效实现油水分离,分离效率可以高达98.2%。

Polyvinylidene fluoride(PVDF)and tetrabutyl titanate(TBOT)are dissolved in a mixed solvent of N,N'-dimethylformamide(DMF)and acetone to electrospun into a fiber membrane.Then,TBOT contained in the electrospun fiber membrane was reduced to titanium dioxide(TiO_(2))by a one-step hydrothermal method at 150℃.The PVDF fiber membrane material with TiO_(2) grown in situ on the surface and inside of the fiber was obtained.The morphology and structure of TiO_(2) grown on PVDF fibers in situ were determined by scanning electron microscopy(SEM),thermal gravity(TG),X-ray diffractometer(XRD)and Fourier infrared absorption spectroscopy(FT-IR).Then,the degradation effect of the composite film on the three organic dyes (rhodamine B, methyl orange and methylene blue) was tested by UV-visible spectroscopy. Finally, the gravity-driven method was used to separate the oil-water mixture, and the contact angle of the composite membrane to water and oil was tested to explore the oil-water separation effect of the composite membrane. Results show that the composite membrane has a good degradation effect on organic dyes such as rhodamine B, methyl orange, methylene blue. The composite membrane also has good lipophilic and hydrophobic properties. It is separated by a mixture of carbon tetrachloride and water. The composite membrane can effectively realize oil-water separation, and the oil-water separation efficiency can be as high as 98.2%.