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TiO2/Fe2O3 heterostructures with enhanced photocatalytic reduction of Cr(vi) under visible light irradiation

机译：TiO2 / Fe2O3异质结构在可见光下增强了Cr（vi）的光催化还原

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We report a study on the synthesis of TiO _(2) /Fe _(2) O _(3) (TF) nanocomposites and their photocatalytic performance under visible-light irradiation. The characterization of structure and morphology shows that hematite Fe _(2) O _(3) was deposited on anatase TiO _(2) nanoparticles with particle sizes in the range of 20–100 nm. In contrast to pure TiO _(2) and pure Fe _(2) O _(3) , the nanocomposites exhibited remarkable photocatalytic activity. For example, the photoreduction efficiency of TF0.5 reaches 100% for a 100 ppm Cr( VI ) solution within 160 minutes. The photochemical properties were studied by various methods. Finally, we conclude that the excellent performance of the photocatalysts is mainly attributed to two aspects: the enhanced absorption of visible light and the synergistic effect of an internal electric field at the heterojunction and citric acid for promoting the separation of electron–hole pairs.
机译：我们报告了对TiO _（2）/ Fe _（2）O _（3）（TF）纳米复合材料的合成及其在可见光照射下的光催化性能的研究。结构和形态表征表明，赤铁矿Fe _（2）O _（3）沉积在粒径为20–100 nm的锐钛矿型TiO _（2）纳米粒子上。与纯TiO _（2）和纯Fe _（2）O _（3）相比，纳米复合材料表现出显着的光催化活性。例如，对于160 ppm的100 ppm Cr（VI）溶液，TF0.5的光还原效率达到100％。通过各种方法研究了光化学性质。最后，我们得出结论，光催化剂的优异性能主要归因于两个方面：可见光吸收增强以及内部电场在异质结和柠檬酸处的协同效应，以促进电子-空穴对的分离。

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