采用气相扩散火焰燃烧合成铁掺杂TiO2纳米晶, 研究了铁掺杂TiO2纳米晶在可见光辐照下降解罗丹明B的活性, 探讨了可见光染料敏化光催化机理. Fe3+掺杂可显著提高TiO2纳米晶的可见光催化活性, Fe3+最佳掺杂摩尔分数为0.12％. 经过铁掺杂改性后, Fe3+的3d电子也可被可见光激发引发光催化反应, 从而促进整个染料敏化光催化降解过程.
Fe3+ doped TiO2 nanoparticles were synthesized by diffusion flame method. The activity of Fe-TiO2 nanoparticles on the photodegradation of RhB was investigated under visible light irradiation. And the photosensitized degradation mechanism was elaborated to demonstrate the improved photocatalytic activity of F-doped TiO2 nanoparticles. The best of photocatalytic activity of 0.12mol％ Fe3+ doped TiO2 nanoparticles are attributed to the charge-transfer transition from 3d orbital of Fe3+ to the conduction band of TiO2 under visible light irradiation, which can lead to effectively hpotocatalytic reaction.
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