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采用XPS和ESR表征技术研究表明，Cr（Ⅵ）离子在TiO2表面的光催化还原过程中，有Ti3+物种生成并参与了Cr（Ⅵ）离子的还原反应。实验结果表明，Cr（Ⅵ）离子的光催化还原主要以从Ti3+上得到电子的间接还原为主，同时也存在着从TiO2导带捕获先激发电子发生直接还原的可能性。
The results of XPS and ESR characterization indicated that Ti3 + species was formed and involved in the reduction of Cr (Ⅵ) ions during the photocatalytic reduction of Cr (Ⅵ) ions on TiO2 surface. The experimental results show that the photocatalytic reduction of Cr (Ⅵ) ions is mainly dominated by the indirect reduction of electrons from Ti3 +, and the possibility of direct reduction of the first excited electrons captured by the conduction band of TiO2 exists.