先进的TiO2 / Fe2TiO5 / Fe2O3三异质结，具有增强的和稳定的可见光驱动的芬顿反应，可去除有机污染物,Applied Catalysis B: Environment and Energy

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先进的TiO2 / Fe2TiO5 / Fe2O3三异质结，具有增强的和稳定的可见光驱动的芬顿反应，可去除有机污染物
Applied Catalysis B: Environment and Energy ( IF 20.2 ) Pub Date : 2017-04-22 10:49:54
Yuanxin Deng, Mingyang Xing, Jinlong Zhang

对于非均相的光-芬顿反应（PFR），高效和稳定的催化剂结构一直是有机污染物降解的主要挑战。在这里，我们成功地开发了一种先进的TiO ₂ / Fe ₂ TiO ₅ / Fe ₂ O ₃三异质结结构，该方法以介孔TiO ₂球为基质，通过简单的离子交换方法。XRD和HRTEM结果表明，在TiO ₂和Fe ₂ O ₃的界面上生成了Fe ₂ TiO ₅，可以用作“桥”来转移TiO中的光激发电子。₂至Fe ₂ O ₃。所制备的三异质结具有丰富的相间边界，极大地改善了光激发电荷在不同组分之间的迁移。结果，与Fe ₂ O ₃和TiO ₂的单一催化剂相比，制得的三异质结对可见光驱动的甲基橙（MO）和苯酚的无色有机污染物的降解具有显着增强的PFR活性，和TiO ₂ / Fe ₂ O ₃的二元异质结。与传统的Fe ₂ O _3相比基于PFR，三重异质结上的MO和苯酚的降解率可以在10min内从4％增加到87％，在60min内从38％增加到100％。苯酚的总有机碳（TOC）降解率可高达85％。而且，这种先进的三异质结在PFR中具有广泛的pH值应用范围。在pH值为4.0或7.0时，与Fe ₂ O ₃和TiO ₂ / Fe ₂ O ₃的催化剂相比，它对MO的降解表现出更高，更稳定的PFR活性。TiO ₂ / Fe ₂ TiO ₅ / Fe ₂ O ₃的反应速率即使经过第10个循环，其几乎仍保持不变，表明其在环境污染物处理中的广阔应用前景。

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An advanced TiO2/Fe2TiO5/Fe2O3 triple-heterojunction with enhanced and stable visible-light-driven fenton reaction for the removal of organic pollutants

The construction of catalysts with high efficiency and stability for heterogeneous Photo-Fenton reaction Heterogeneous (PFR) has been a major challenge for the degradation of organic pollutants. Here, we successfully develop an advanced TiO₂/Fe₂TiO₅/Fe₂O₃ triple-heterojunction structure by using the mesoporous TiO₂ spheres as the substrate via a simple ion-exchange method. The XRD and HRTEM results demonstrate the generation of Fe₂TiO₅ on the interface between TiO₂ and Fe₂O₃, which can be used as a “bridge” to transfer the photo-excited electrons from TiO₂ to Fe₂O₃. The as-prepared triple-heterojunction has abundant interphase boundaries which greatly improve the migration of photo-excited charges among different components. As a result, the prepared triple-heterojunction has a significantly enhanced PFR activity for the visible-light-driven degradation of methyl orange (MO) and colorless organic pollutant of phenol, compared with the single catalysts of Fe₂O₃ and TiO₂, and the binary-heterojunction of TiO₂/Fe₂O₃. Compared to the traditional Fe₂O₃ based PFR, the degradation rates of MO and phenol over triple-heterojunction can be increased from 4% to 87% within 10min irradiation and from 38% to 100% within 60min irradiation, respectively. And the total organic carbon (TOC) degradation rate of phenol can be up to 85%. Moreover, this advanced triple-heterojunction has a wide pH value range of application in PFR. Either at a pH of 4.0 or 7.0, it shows a much higher and more stable PFR activity for the degradation of MO than the catalysts of Fe₂O₃ and TiO₂/Fe₂O₃. And the reaction rate of TiO₂/Fe₂TiO₅/Fe₂O₃ almost keeps changeless even after 10th cycles, suggesting its vast application foreground in the environmental pollutant treatment.

更新日期：2017-04-23

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