Abstract—

In this study, porous network-like α-Fe₂O₃ and α/γ-Fe₂O₃ nanoparticles (NPs) were synthesized by auto-combustion method and their photocatalytic performance was evaluated using methylene blue (MB) as a dye model. Calcination of the synthesized nanoparticles resulted in α/γ-Fe₂O₃ heterophase magnetite material at 450°С and pure α-Fe₂O₃ at 700 and 800°С. The magnetic property of α/γ-Fe₂O₃ makes the photocatalyst to be easily collected from the photocatalytic system and increases its potential in industrial applications. The α/γ-Fe₂O₃ heterophase material showed a photocatalytic performance almost similar to that of the α-Fe₂O₃ NPs calcined at 800°С, but higher than that of the α-Fe₂O₃ NPs calcined at 700°С. The cliff-like band structure between α-Fe₂O₃ and γ-Fe₂O₃ reduced recombination of photoelectrons and photoholes, thereby improving photocatalytic performance of the α/γ-Fe₂O₃ heterophase material.

中文翻译：

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多孔网络状α-Fe2 O 3和α/γ-Fe2 O 3纳米粒子的合成及其光催化性能的研究

摘要—

在这项研究中，多孔网络状的α-Fe ₂ ö ₃和α/γ-的Fe ₂ ö ₃纳米颗粒（NP）通过自动燃烧法合成，并使用亚甲基蓝（MB）作为染料模型及其光催化性能进行评价。所述合成的纳米颗粒的煅烧导致α/γ-的Fe ₂ ö ₃多相磁铁矿材料在450℃和С纯的α-Fe ₂ ö ₃在700和800°С。的α/γ-铁的磁特性₂ ö ₃使光催化剂从光催化系统可以容易地收集，并增加了其潜在的工业应用中。α/γ-的Fe ₂ ö ₃多相材料显示出光催化性能几乎类似于的α-Fe的_2个ö ₃纳米颗粒在800℃煅烧С，但高于所述的α-Fe的_2个ö ₃纳米颗粒在700℃煅烧С。的α-Fe之间的峭壁状带结构₂ ö ₃和γ-的Fe ₂ ö ₃光电子和光穴的降低的重组，从而改善了α/γ-铁的光催化性能₂ ö ₃多相的材料。