采用溶胶-凝胶法制备了LiF掺杂的TiO2光催化剂,并采用X射线衍射、 X射线光电子能谱和光致发光光谱等技术对样品进行了表征. 以亚甲基蓝的光催化降解为反应模型,考察了LiF掺杂量、退火温度和溶液pH值对催化剂光催化性能的影响. 结果表明, LiF的掺杂降低了金红石相的形成温度,同时在TiO2表面引入大量羟基氧并提高了TiO2表面氧空穴浓度,因此提高了TiO2的光催化性能. 在LiF掺杂量为8%, 退火温度为500 ℃和反应液pH值为6.6的条件下, LiF掺杂的TiO2的光催化活性是未掺杂TiO2的6倍.
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