胶原纤维为模版制备TiO_2及La/TiO_2纳米纤维及光催化活性研究  

Synthesis and Photo-Catalytic Activities of TiO_2 and La/TiO_2 Nano-Fiber Using Collagen Fiber as Template

作　　者：蔡莉[1,2] 吴昊[1,2] 廖学品[1,2] 石碧[2] 

机构地区：[1]四川大学生物质化学与工程系,成都610065 [2]四川大学制革清洁技术国家工程实验室,成都610065

出　　处：《无机化学学报》2011年第4期611-618,共8页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金重点项目(20536030);国家自然科学基金(No.20776090);全国百篇优秀博士论文作者专项基金(FANEDD200762)资助项目

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。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.

关 键 词：胶原纤维 模版 La/TiO2纳米纤维 光催化 

分 类 号：O614.411[理学—无机化学] O614.331[理学—化学]