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以P25纳米粉体和NaOH为原料,采用水热合成法制备出钛酸盐纳米管。通过TEM和XRD表征手段,研究了水热温度和酸洗浓度对钛酸盐纳米管微观形貌和晶型组成的影响。结果表明,用去离子水或低浓度的酸处理反应产物时,纳米管的结构清晰完整,其成分主要是H2Ti2O5.H2O;用高浓度的酸处理反应产物时会破坏纳米管结构,其成分主要是锐钛矿型TiO2。反应温度对产物的微观结构和晶型组成也有显著影响:水热温度90℃时的产物只能得到膜状物和少量纳米管,而水热温度从110℃升至190℃时,纳米管的长度逐渐增长,而管径基本不变;低温反应得到的产物晶型与原料类似,较高反应温度的产物为锐钛矿。
P25 nano-powder and NaOH as raw materials, hydrothermal synthesis of titanate nanotubes. The effects of hydrothermal temperature and pickling concentration on the morphology and crystalline composition of titanate nanotubes were investigated by means of TEM and XRD. The results show that the structure of the nanotubes is clear and complete when the reaction product is treated with deionized water or a low concentration of acid. The composition of the nanotubes is mainly composed of H2Ti2O5.H2O. When the reaction product is treated with a high concentration of acid, the nanotube structure is destroyed, Is anatase TiO2. The reaction temperature also has a significant effect on the microstructure and crystal composition of the product: the product at hydrothermal temperature of 90 ℃ can only get the film-like material and a few nanotubes, while the hydrothermal temperature rises from 110 ℃ to 190 ℃, The length increases gradually, but the diameter is basically the same. The product obtained by the low temperature reaction is similar to the raw material, and the product with the higher reaction temperature is anatase.