采用溶胶-凝胶法制备了La3+非均匀掺杂的TiO2薄膜. 通过对甲基橙的光催化降解实验来评价催化剂薄膜的催化活性, 结果表明: La3+的掺杂方式对TiO2的催化活性有很大的影响, 采用非均匀掺杂方式可以明显提高TiO2的催化活性, 掺杂浓度以0.5%(原子分数)为最佳. 紫外-可见漫反射光谱显示其吸收带边明显红移;电化学行为表明其光生空穴-电子对的形成能力和分离效率得到提高. 通过比较太阳能光电池异质结的"窗口效应"理论, 初步探讨了La3+非均匀掺杂对TiO2的光催化活性的影响机制.
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