中文摘要：

以廉价Ti（SO4）2为钛源、水热处理制备的Na2Ti3O7纤维为原料,通过两种方法制备锐钛矿型TiO2纤维：方法一,将Na2Ti3O7纤维在0.05mol/LHNO3水溶液中水热晶化;方法二,先将Na2Ti3O7纤维在0.1mol/L HCl中进行离子交换,然后在500～800℃焙烧。用扫描电镜、透射电镜、能量发散X射线衍射、X射线衍射和N2吸附/脱附等手段表征Na2Ti3O7纤维及不同方法制备的TiO2纤维的结构与性能。结果表明：Na2Ti3O7纤维为层状结构的实体纤维,其平均长径比在100以上。采用方法一制得的TiO2纤维为锐钛矿型,长约5～15μm,宽约80nm,纤维表面附有粒径约为25nm的TiO2颗粒;采用方法二通过离子交换和焙烧实现了由钛酸-TiO2（B）-锐钛矿TiO2的转变,纤维形貌基本保持完整,长约5～10μm,宽约200nm。

英文摘要：

Fibers Na2Ti3O7 were prepared using cheap Na（SO4） 2 as titania precursor,and two methods were developed to produce anatase TiO2 fibers.The first method is hydrothermal treatment of Na2Ti3O7 fibers in 0.05 mol/L HNO3 solution,and the second method is to ion-exchange the Na2Ti3O7 fibers with 0.1 mol/L HCl,followed by calcining at 500-800℃.Themicrostructure and properties of samples were characterized by the scanning electron microscope,transmission electron microscope,energy dispersive X-ray analysis,X-ray diffraction,and N2 adsorption/desorption.The results indicate that Na2Ti3O7 fibers are of a solid structure and the length/width ratio is over 100.Anatase TiO2 fibers prepared using the first method had lengths of 5-15μm and a width of ca 80 nm,with some TiO2 nanoparticles with a size of ca 25 nm covered on the fibers.The titania fibers prepared by the second method experience the structural changes from H2TiO3-TiO2（B） -anatase TiO2 fibers when Na2Ti3O7 fibers are ion-exchanged and calcined. The final anatase TiO2 fibers have integrity and have lengths of 5-10μm and a width of ca 200 nm.