Abstract:
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 °C. 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%.