摘要：为了考察pH值及含水量对溶胶-凝胶自蔓燃法制备TiO₂粉体光催化性能的影响,以TiO(NO₃)₂为前驱体,在原料、燃烧剂和燃烧助剂的物质的量比为n(TiCl₄)∶n(C₆H₈O₇)∶n(NH₄NO₃)=1∶1∶3,以及煅烧温度550℃不变的情况下,改变溶胶pH值和含水量,制备TiO₂粉体,利用X射线衍射和扫描电镜进行结构表征,通过降解亚甲基蓝验证光催化性能。结果表明:该条件下制备的TiO₂粉体具有松散、多孔的特性,晶型为锐钛矿。在pH值为7、含水质量分数为50%的条件下,TiO₂的光催化活性最高。

关键词： pH值;含水量;光催化活性

Abstract： In order to investigate the effects of pH value and water content on the photocatalytic activity of TiO₂ prepared by sol -gel auto-igniting synthesis （SAS） method， TiO₂ powders were prepared by changing pH value and water content， while using TiO （NO₃） ₂ prepared by the TiCl4 as precursor， and fixing the ratio of n(TiCl₄)∶n(C₆H₈O₇)∶n(NH₄NO₃)=1 ∶ 1 ∶ 3， the sintering temperature was 550 ℃. The results showed that the photodegradation rates constant gave the highest values with TiO₂ powders prepared with pH value of 7 and water mass fraction of 50%. The powders showed as excellent loose and porous materials.

Keywords： pH value； water content； photocatalytic activity