以胶原纤维为模板分别负载钛(Ti4＋)或钛(Ti4＋)和镧(La3＋),经高温煅烧制得介孔 TiO 2和Lax/TiO 2纳米纤维.通过场发射扫描电镜(FESEM)、N2吸附-脱附等温线、X 射线衍射(XRD)、分子荧光光谱(PL)和紫外-可见吸收光谱(UV-Vis)等对这2类纳米纤维的结构和物理性能进行了表征.结果表明胶原纤维的纤维状结构能被较好地保留在TiO 2和 Lax/TiO 2纳米纤维中.TiO 2和 Lax/TiO 2纳米纤维的 N2吸附-脱附等温线属于典型的Ⅳ型,表明其具有介孔结构.XRD 分析表明,La3＋的掺杂减小了 TiO 2的晶粒尺寸.与 Degussa P25相比,介孔TiO 2和 Lax/TiO 2(x ≤0．02)纳米纤维的紫外-可见吸收光谱红移,分子荧光光谱强度明显减弱.以孔雀石绿的光催化降解为模型反应,在可见光和紫外光激发下,介孔 TiO 2和 Lax/TiO 2纳米纤维的光催化活性均高于 Degussa P25.此外,Lax/TiO 2在可见光激发下的光催化活性高于未掺杂的 TiO 2纳米纤维.
Mesoporous TiO 2 and Lax/TiO 2 nano-fiber were prepared by loading titanium (Ti4+ ),or titanium (Ti4+ )and lanthanum (La3 + )on collagen fiber template,respectively,and then heat treated.The physico-chemical properties of these nano-fibers were fully characterized by means of field emission scanning electron microscopy (FESEM),N2 adsorption-desorption,X-ray diffraction (XRD),photoluminescence spectra (PL) and UV-Vis absorption spectra.It was found that the fibrous morphology of collagen fiber was well preserved in the TiO 2 and La0.02/TiO 2 nano-fibers.The N2 adsorption-desorption isotherms of TiO 2 and Lax/TiO 2 nano-fi-bers were the typical type Ⅳ,which associated with the characteristics of mesoporous materials.XRD analysis showed that La3 + doped into TiO 2 has a significant influence on crystal size of TiO 2 .Compared with Degussa P25,the TiO 2 and Lax/TiO 2 (x ≤0.02)nano-fibers showed a red-shift in their UV-Vis absorption spectra,and their PL spectra intensity also exhibited a significant decrease.By using the photocatalytic degradation of mala-chite green (MG)as a model reaction,mesoporous TiO 2 and Lax/TiO 2 nano-fibers exhibited much higher pho-tocatalytic activities than Degussa P25 under visible light and UV light irradiation.In addition,Lax/TiO 2 nano-fibers showed remarkably improved visible light catalytic efficiency than that of un-doped TiO 2 nano-fibers.
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