水热法制备TiO2纳米管及其影响因素的研究

分别以金属钛(Ti)和氧化钛(TiO2)为原料,通过水热法制备TiO2纳米管,研究水热温度、pH、不同钛源和n(TiO2)/n(NaOH)的比值对TiO2纳米管形貌的影响。结果表明,在最佳实验条件(t=150℃,pH=10~12,n(TiO2)/n(NaOH)=6.25×10-4)下,以TiO2作钛源时制备出管壁厚度和外径分别为2 nm和8~10 nm的TiO2纳米管;以金属钛粉作钛源所制备的TiO2纳米管,其壁厚、外径分别约为1~1.5 nm和3~5 nm,明显小于前者。在温度为130℃~170℃、pH=8~12范围内,温度、pH对TiO2纳米管的壁厚和管径基本无影响。

Research on Affecting Factors of Preparation of TiO2 through Hydrothermal Method

The influence of different factors, such as hydrothermal temperature, pH, titanium sources and n （TiO2）/n （NaOH）, on the morphology of TiO2 was studied, using Ti and TiO2 as titanium source, respectively. The results indicated that, under the best experiment condition （t=150 , pH=10-12 and n（TiO2）/n （NaOH）= 6.25＆#215;10-4）, the TiO2 nanotubes that were 2 nm in wall thickness and 8-10 nm in outer diameter were made through hydrothermal preparation. When the titanium source was titanium powder, the wall thickness of the prepared TiO2 nanotubes was 1-1.5 nm and the outer diameter was 3-5 nm, which was obviously smaller than that of the former. When temperature was in the range of 130 ℃ to 170 ℃ and pH was in the range of 8 to 12, the wall thickness and the outer diameter were hardly influenced by temperature and pH.