三层同轴静电纺丝技术制备TiO2@SiO2同轴双壁亚微米管及光催化性能研究

采用三层同轴静电纺丝技术,以钛酸丁酯、正硅酸乙酯、聚乙烯吡咯烷酮、无水乙醇、芝麻油、山梨糖醇酐油酸酯和氯仿为原料,成功制备出TiO2@SiO2同轴双壁亚微米管.用差热–热重分析、X射线衍射、红外光谱仪、扫描电镜、透射电镜和能谱仪对样品进行了表征.结果表明,得到的产物为TiO2@SiO2同轴双壁亚微米管,以非晶态SiO2为外壳,晶态金红石型TiO2为内壁,同轴双壁亚微米管平均直径约680 nm,管壁厚约70 nm、内壁厚约40 nm、外壳厚约30 nm,长度大于20μm,对其形成机理进行了分析.同轴双壁亚微米管对罗丹明B显示了较好的光催化活性.

Preparation of TiO2@SiO2 Coaxial Double-walled Submicrotubes by Trifluidic Coaxial Electrospinning and Its Photocatalytic Property

Coaxial double-walled submicrotubes have potential extensive applications in many fields owing to their peculiar submicrostructures.The electrospinning has become a major method for preparation of one-dimensional nano-or micromaterials.In order to invent a facile technique to fabricate coaxial double-walled submicrotubes,a modified electrospinning was employed.TiO2@SiO2 coaxial double-walled submicrotubes were successfully synthesized by trifluidic coaxial electrospinning technique using tetrabutyl titanate,tetraethyl orthosilicate,polyvinyl pyrrolidone,absolute ethanol,sesame oil,span-80 and chloroform as starting materials.The samples were characterized by thermogravimetry and differential thermal analysis,X-ray diffractometry,Fourier transform infrared spectrometry,scanning electron microscopy,transmission electron microscopy and energy dispersive spectrometry.The results indicated that the products are TiO2@SiO2 coaxial double-walled submicrotubes with an amorphous SiO2outer shell,a crystalline rutile-typed TiO2inwall.The submicrotubes possess an average diameter of ca.680 nm,wall thickness of the tubes of ca.70 nm,inwall of ca.40 nm and outer shell of ca.30 nm.The length of submicrotubes is greater than 20 μm.The formation mechanism of TiO2@SiO2 coaxial double-walled submicrotubes is preliminarily investigated.TiO2@SiO2 coaxial double-walled submicrotubes present better photocatalytic activity on rhodamine B.The simple preparation method is also appropriate for fabricating other coaxial multi-walled nano-or submicrotubes of inorganics.