六钛酸钾晶须的低能耗制备和光催化性能

Preparation of extra-fine K_2Ti_6O_(13) by low energy consumption method and its photocatalysis properties

用TiCl4作为钛源,用环氧化物驱动溶胶-凝胶化动力学过程,预制备出纳米TiO2粉末;将此纳米粉与乙酸钾混合,经烧结制备出K_2Ti_6O_(13)晶须。研究不同烧结温度和保温时间对晶须结构与形貌影响;利用XRD和SEM对其晶相组成和形貌进行分析,并对其光催化活性进行分析表征。结果表明,样品在1 000℃保温3h,自然冷却,可获得超细六钛酸钾晶须;晶须平均直径在0.3μm,长径比(L/D)最大可达到12,粗细均匀,分散性良好;在500 W汞灯照射1h条件下,制备的六钛酸钾晶须对抗生素(四环素tetracycline,TC)为模型探针分子具有优异的光催化性能。

The nano TiO2 powders were prepared by an epoxide epoxy-driven sol-gel method with TiCl4 solution as titanium source.Then,the self-made nano TiO2 powders were mixed with potassium acetate to prepare K2Ti6O13 whisker.The effects of sintering temperature and holding time on the crystal structure and morphology of potassium titanate were investigated in detail.The phase composition and morphology of the prepared whiskers were analyzed by XRD and SEM and the photochemical reaction apparatus was utilized to analyze the photocatalytic activity of whiskers.The results indicated that high quality of potassium hexatitanate whiskers with a better yield could be obtained under the calcining condition of 900 ℃ for 3 h.The average diameter of prepared whisker with uniform thickness and good dispersion is in the range of 0.3μm,the ratio of length to diameter（L/D）can approach as 12.Furthermore,TC modeling molecular can be decomposed completely by the whiskers irradiated for 1 h with a 500 W mercury lamp,which shows that the prepared potassium titanate whiskers are a good type of materials for the pollution management.