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以市售廉价的锐钛矿型二氧化钛粉体为原料,在10 mol/L的氢氧化钠溶液中,采用超声辅助水热法合成出超长的二氧化钛纳米管;利用扫描电镜,透射电镜,数码显微镜和X射线衍射仪对超声处理和超声辅助水热处理得到的产物分别进行表征;研究了超声波功率、超声波频率和温度对产物形貌和晶体结构的影响。结果表明,在研究的超声功率和频率范围内,当超声作用温度≥60℃时,超声作用使二氧化钛颗粒在碱液中溶胀得到一种多触角的絮状中间产物,该中间产物在90℃,5 h的温和水热条件下即可以合成出几十微米长的二氧化钛纳米管。初步分析了合成机理,超声波处理得到的多触角絮状产物对合成几十微米长的二氧化钛纳米管起着至关重要的作用。
Titanium dioxide nanotubes with ultra-long length were synthesized by ultrasonic assisted hydrothermal method in the market of 10 mol / L sodium hydroxide solution using commercially available low-cost anatase titanium dioxide powder as raw material. Scanning electron microscopy, transmission electron microscopy, The products obtained by ultrasonic treatment and ultrasonic assisted hydrothermal treatment were characterized by means of microscope and X-ray diffraction. The effects of ultrasonic power, ultrasonic frequency and temperature on the morphology and crystal structure of the product were studied. The results showed that under the ultrasonic power and frequency range of the study, when the ultrasonic action temperature is ≥60 ℃, the ultrasonic action makes the titanium dioxide particles swell in alkaline solution to obtain a kind of multi-antenna flocculent intermediate product. The intermediate product is stable at 90 ℃, 5 h of mild hydrothermal conditions that can be synthesized tens of microns long titanium dioxide nanotubes. The synthesis mechanism was analyzed preliminarily. The multi-antenna flocculent product obtained by ultrasonic treatment played a crucial role in the synthesis of titania nanotubes of tens of micrometers in length.