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采用两种技术路线合成了钙钛矿型SrFeO3光催化剂,并对其光催化行为进行深入研究。结果表明,聚乙二醇的加入对纯相SrFeO3的形成有一定的影响。当体系中不加入聚乙二醇时,无论怎样改变反应条件,最终产物中仍含有SrCO3杂质;当体系中加入聚乙二醇时,能够得到纯相SrFeO3。甲基橙光降解实验结果表明,与纯相的SrFeO3相比,杂相的SrFeO3在可见光下具有较高的活性。光催化稳定性研究表明,含有杂相的SrFeO3光催化实验后其自身结构发生晶格坍塌,而纯相SrFeO3光催化测试后样品的结构没有明显变化,由此可以推出SrFeO3所显示的光催化活性有可能来自于其晶格内的Fe4+离子和表面氧空位的共同作用。
The perovskite-type SrFeO3 photocatalyst was synthesized by two technical routes and its photocatalytic activity was further studied. The results show that the addition of polyethylene glycol has a certain impact on the formation of pure SrFeO3. When polyethylene glycol is not added in the system, the final product still contains SrCO3 impurity no matter how the reaction conditions are changed. When polyethylene glycol is added into the system, pure phase SrFeO3 can be obtained. The experimental results of methyl orange photodegradation show that compared with the pure phase of SrFeO3, heterogeneous SrFeO3 has high activity in visible light. Photocatalytic stability studies show that the lattice structure of SrFeO3 with heterogeneous phase after photocatalysis experiment collapses, while the pure phase SrFeO3 photocatalytic test sample structure does not change significantly, which can be introduced SrFeO3 photocatalytic activity It is possible that the interaction between Fe4 + ions in the crystal lattice and the oxygen vacancies on the surface of the crystal lattice is possible.