微波水热法合成钛酸钠盐纳米管

Synthesis of Sodium Titanate Nanotubes by Microwave Hydrothermal Method

采用微波水热法合成了钛酸钠盐纳米管,考察了原料、反应时间、NaOH浓度等主要影响因素.在微波功率195W、NaOH浓度8—12mol/L、反应时间>70min条件下,得到了形貌均一的钛酸钠盐纳米管,并用TEM、XRD、BET、EDAX和N2吸附/脱附等对产物进行了表征.研究表明,微波法制得的纳米管合成时间短、热稳定性高,其管壁塌陷温度高于500℃,比普通水热法合成的高100℃左右;所得样品在300℃以上煅烧,可转化为单晶钛酸纳盐纳米管.

The effects of raw material, reaction time, NaOH concentration were studied on the synthesis of sodium titanate nanotubes via a microwave hydrothermal method. Sodium titanate nanotubes with a uniform morphology were synthesized in NaOH solution (8 similar to 12mol/L), heated by a microwave power of 195W over 70min. The samples were investigated by means of TEM, XRD, BET, EDAX and N-2 adsorption/desorption technique. The nanotubes derived from the microwave hydrothermal method features shortened reaction time and higher thermal stability, with the tube structure collapsed at a temperature over 500 degrees C, 100 degrees C higher than that synthesized by the ordinary hydrothermal method. Furthermore, the samples after calcination at 300 degrees C will convert into single crystalline sodium titanate nanotubes.