合成温度对二氧化钛纳米管的影响

The influence of synthesis temperature on the titania nanotube

以P25纳米粉体和NaOH为原料,采用水热合成法,在不同的合成温度下制备TiO2纳米管。用XRD、TEM、BET、TG-DSC、Uv-vis等方法对TiO2纳米管的形貌、成分和性能进行了表征。结果表明,合成温度对产物有显著影响:随着反应温度的升高,纳米管的比表面积逐渐增大,长度逐渐增长,而管径基本不变,纳米管的产率也有增加的趋势。150℃反应制得粉体的比表面积为641.855m2/g,管外径为8nm。160℃反应制得的粉体经560℃处理后降解亚甲基蓝的能力要远优于市售的P25纳米粉体。鉴于以前水热处理温度对纳米管形成方面的影响研究报道较少,系统的研究了温度对纳米管形成的影响。

TiO2 nanotube was synthesized successfully within a range of temperature by hydrothermal process, using P25 powder and NaOH （A. R grade） as the precursor. The titania nanotube was characterized by XRD, TEM,BET,TG-DSC and Uv-vis. These results suggest that the surface area and the length of the nanotube increase and the diameter of the nanotube almost keep a fixed value with the temperature; the productivity of the nanotube also increases with the temperature. The as-prepared nanotube at 150℃ with outer diameters of - 8nm has surface area of 641. 855m^2/g. The powder prepared at 160℃ and then treated at 560℃ shows an great enhancement in the photodegradation efficiency of methylene blue under ultraviolet irradiation compared to commercially available P25. As there are few reports in literatures about the influence of synthesis temperature on the titania nanotube, so we study the influence of synthesis temperature on the titania nanotube systematically.