| 胶原纤维为模版制备TiO2及La/TiO2纳米纤维及光催化活性研究 | |
| Synthesis and Photo-Catalytic Activities of TiO2 and La/TiO2 Nano-Fiber Using Collagen Fiber as Template | |
| 摘要: 以胶原纤维为模版分别负载钛(Ti4+)或钛(Ti4+)和镧(La3+)，在高温下煅烧制得TiO2和La/TiO2纳米纤维。通过扫描电镜(SEM)、场发射扫描电镜(FESEM)、X-射线衍射(XRD)、比表面积和孔径分析、X-射线光电子能谱(XPS)、紫外可见光谱(UV-Vis)等对这2种纳米纤维的结构和物理性能进行了表征。结果表明，TiO2和La/TiO2较完整地保持了胶原纤维的纤维状结构。在600~800 ℃范围内随着煅烧温度的升高，TiO2和La/TiO2的晶粒尺寸逐渐增大，晶格常数发生各相异性的变化。La/TiO2的相变温度在700~800 ℃之间，明显高于未掺杂TiO2的相变温度。N2吸附-脱附等温线按Langmiur分类为Ⅳ类，表明TiO2和La/TiO2纳米纤维具有介孔结构。与Degussa P25相比，TiO2和La/TiO2吸收光谱范围明显红移。当以可见光为光源进行酸性橙Ⅱ光助催化降解反应时，TiO2和La/TiO2纳米纤维均表现出比Degussa P25更高的催化活性。 | |
| 关键词: 胶原纤维 模版 La/TiO2纳米纤维 光催化 | |
| 基金项目: | |
| Abstract: TiO2 and La/TiO2 nano-fiber were prepared by loading Titanium (Ti4+), or Titanium (Ti4+) and Lanthanum (La3+) on collagen fiber template. Their structure and physical properties were characterized by means of scanning electron microscopy (SEM), field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), specific surface analyzer, X-ray photoelectron spectroscopy (XPS) and UV-Vis spectroscopy. The results show that the natural fiber morphology of collagen fiber is mostly preserved in the TiO2 and La/TiO2 nano-fibers. When the calcination temperature increases from 600 to 800 ℃, the particle sizes of TiO2 and La/TiO2 increase gradually and the changes of their crystal lattice constants (a and c) are different at each dimension. It is also found that the phase transformation temperature of La/TiO2 nano-fiber is in range of 700~800 ℃, which is higher than that of pure TiO2 nano-fiber. The N2 adsorption-desorption isotherms of TiO2 and La/TiO2 nano-fibers are the typical type IV associated with the characteristic of mesoporous materials. Compared with Degussa P25, the absorbance wavelength of TiO2 and La/TiO2 nano-fiber is apparently red shifted. By using the photo-assisted catalytic degradation of acidic orange II as model reaction, the visible light catalytic efficiencies of P25, TiO2 and La/TiO2 nano-fibers were evaluated. The reaction results show that the TiO2 and La/TiO2 nano-fibers exhibit higher visible light catalytic activities than that of Degussa P25. | |
| Keywords: collagen fiber template La/TiO2 nano-fiber photo-assisted catalysis | |
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| 蔡 莉,吴 昊,廖学品,石 碧.胶原纤维为模版制备TiO2及La/TiO2纳米纤维及光催化活性研究[J].无机化学学报,2011,27(4):611-618. | |
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