以胶原纤维为模板,硫酸钛为钛源,通过 Ti (Ⅳ)与胶原纤维发生配位反应,将其负载于胶原纤维上,经过煅烧除去胶原纤维模板而获得具有介孔结构的TiO2纤维.通过场发射扫描电镜、N2吸附-脱附、广角XRD衍射、分子荧光光谱等分析手段对所制备的TiO2纤维的表面结构、孔结构和晶体结构等进行表征.实验结果表明,硫酸钛与胶原纤维质量比及煅烧温度明显影响TiO2纤维的表面形貌和孔结构.当硫酸钛与胶原纤维质量比为8∶5,煅烧温度为600℃,所制备的TiO2纤维能较完整地保留天然胶原纤维的形貌和有序的介孔结构,孔径分布集中在4．3 nm.酸性橙Ⅱ的光催化降解实验表明,具有介孔结构的 TiO2纤维的光催化活性明显高于无介孔结构的 Degussa P25.
Mesoporous TiO2 fiber was prepared using collagen fiber as the template and Ti(SO4 )2 as the titanium source.The Ti(Ⅳ)was loaded on collagen fiber by chelation reaction,and then the mesoporous TiO2 fiber was obtained after heat-treatment to remove the template of collagen fiber.The surface morphology and pore struc-ture of the as-prepared mesoporous TiO2 fiber were characterized by means of field emission scanning electron microscopy,N2 absorption-desorption isothermal method,wide angle XRD and photoluminescence spectra (PL).The experimental results indicated that the mass ratio of Ti(SO4 )2 to collagen fiber and calcination tem-perature significantly influenced the surface morphology and mesoporous structure of TiO2 fiber.When the mass ratio was 8∶5 and calcination temperature was 600 ℃,the morphology of nature collagen fiber was well preserved in the as-prepared mesoporous TiO2 fiber,and the mesoporous structure was in ordered and the pore size distribution was centered in 4.3 nm.The photo-catalytic degradation of acid orange Ⅱ experiments indicated that the photo-catalytic activity of the as-prepared mesoporous TiO2 fiber was much higher than that of Degussa P25 without mesoporous structure.
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