The preparation and photocatalytic performance of Bi2Fe4O9/NiFe2O4 composite photocatalyst
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The magnetic n–p type Bi2Fe4O9/NiFe2O4 heterostructures with different mass fraction ratios were synthesized by a simple hydrothermal method. A variety of characterization tools involving X-ray diffraction, scanning electron microscope, ultraviolet–visible diffuse reflectance (DRS UV–Vis), fluorescence were applied to analyze the basic characteristics of Bi2Fe4O9/NiFe2O4. The photocatalytic oxidation capacities of Bi2Fe4O9/NiFe2O4 composite were studied through the degradation of methylene blue under UV light. The as-prepared samples exhibited more efficient photocatalytic activities than pure Bi2Fe4O9 and NiFe2O4, which could be attributed to the formation of the n–p junction between n-Bi2Fe4O9 and p-NiFe2O4. Simple magnetic test showed Bi2Fe4O9/NiFe2O4 had good magnetic recovering properties. Continuous photocatalytic experiments demonstrated that the heterojunction structure of Bi2Fe4O9/NiFe2O4 was stable. Based on the results of trapping agents experiments and fluorescence characterization, the catalytic oxidation mechanism of Bi2Fe4O9/NiFe2O4 composite catalysts were further studied, which indicated that ·OH and h+ played critical roles in the process of photocatalytic degradation.
KeywordsBi2Fe4O9/NiFe2O4 Magnetic Photocatalytic degradation Catalytic oxidation mechanism
- Gadhi TA, Hemández S, Castellino M, Chiodoni A, Husak T, Barrera G, Allia P, Russo N, Tagliaferro A (2018) Single BiFeO3 and mixed BiFeO3/Fe2O3/Bi2Fe4O9 ferromagnetic photocatalysts for solar light driven water oxidation and dye pollutants degradation. J Ind Eng Chem 63:437–448. https://doi.org/10.1016/j.jiec.2018.03.004 CrossRefGoogle Scholar
- Zhang LS, Wong KH, Yip HY, Yip HY, Hu C, Yu JC, Chan CY, Wong PK (2010) Effective photocatalytic disinfection of E. coli K-12 using AgBr–Ag–Bi2WO6 nanojunction system irradiated by visible light: the role of diffusing hydroxyl radicals. Environ Sci Technol 44:1392–1398. https://doi.org/10.1021/es903087w CrossRefGoogle Scholar