Preparation, Characterization And Photocatalytic Activity Of Tio2 And Lax/Tio2 Nanofibers Using Collagen Fibers As Templates
Keywords
Collagen Fiber, Template, Tio2 Nanofiber, Mesoporous Material, Photocatalyst
Abstract
Collagen fibers are used as templates to load titanium (Ti4+) or titanium (Ti4+) and lanthanum (La3+) respectively, and then calcined at high temperature to prepare mesoporous TiO2 and Lax/TiO2 nanofibers. The two types of nanofibers were studied through field emission scanning electron microscopy (FESEM), N2 adsorption-desorption isotherm, X-ray diffraction (XRD), ultraviolet-visible absorption spectrum (UV-Vis) and molecular fluorescence spectrum (PL). The structure and physical properties were characterized. The results show that the fibrous structure of collagen fibers can be well retained in TiO2 and Lax/TiO2 nanofibers. The N adsorption-desorption isotherms of TiO2 and Lax/TiO2 nanofibers belong to the typical type IV, indicating that they have a mesoporous structure. XRD analysis shows that the doping of La3+ affects the grain size of TiO2. Compared with Degussa P25, the UV-visible absorption spectra of mesoporous TiO2 and Lax/TiO2 (x¡Ü0.02) nanofibers are red-shifted, and the molecular fluorescence spectrum intensity is significantly weakened. Using the photocatalytic degradation of malachite green as a model reaction, the photocatalytic activity of mesoporous TiO2 and Lax/TiO2 nanofibers was confirmed. Under visible light and ultraviolet light excitation, the photocatalytic activity of mesoporous TiO2 and Lax/TiO2 nanofibers is higher than that of Degussa P25. In addition, the photocatalytic activity of Lax/TiO2 under visible light excitation is higher than that of undoped TiO2 nanofibers.
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Original research was done by Cai Li
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