Preparation Of Tio2 And La/Tio2 Nanofibers Using Collagen Fibers As Templates And Research On Their Photocatalytic Activity
Keywords
Collagen Fiber, Template, La/Tio2 Nanofiber, Photocatalysis
Abstract
Collagen fibers are used as templates to load titanium (ti4+) or titanium (ti4+) and lanthanum (la3+) respectively, and are calcined at high temperatures to obtain tio2 and la/tio2 nanofibers. Through scanning electron microscopy (sem), field emission scanning electron microscopy (fesem), x-ray diffraction (xrd), specific surface area and pore size analysis, x-ray photoelectron spectroscopy (xps), ultraviolet-visible spectroscopy (uv-vis), etc. The structure and physical properties of the two nanofibers were characterized. The results showed that tio2 and la/tio2 relatively intactly maintained the fibrous structure of collagen fibers. As the calcination temperature increases in the range of 600~800¡ãC, the grain sizes of tio2 and la/tio2 gradually increase, and the lattice constants change anisotropically. The phase transition temperature of la/tio2 is between 700 and 800¡ãC, which is significantly higher than the phase transition temperature of undoped tio2. The n2 adsorption-desorption isotherm is classified as type IV by Langmiur, indicating that tio2 and la/tio2 nanofibers have mesoporous structure. Compared with degussap25, the absorption spectral ranges of tio2 and la/tio2 are significantly red-shifted. When visible light was used as the light source to carry out the photocatalytic degradation reaction of acid orange ¢¢, both tio2 and la/tio2 nanofibers showed higher catalytic activity than degussap25.
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Original research was done by Cai Li, Wu Hao, Liao Xuepin, Shi Bi
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