Abstract
In this work, iron phosphate (FePO4 or FP) nanosheets (NSs) were subjected to a direct high-temperature heating method in the air (FP-Air), argon (FP-Ar), and vacuum (FP-Vac) atmospheres. The conversion of FP NSs from amorphous to crystalline was confirmed using XRD and the induced defects due to the different annealing atmospheres were identified by Rietveld refinement of the XRD data. Valence XPS was used to determine the valence band maximum of these structures; the FP-Air sample was found to have the largest bandgap, while the FP-Vac sample had the narrowest bandgap. The three FP NSs samples were compared in terms of their ability to degrade crystal violet (CV), a cationic dye. The FP-Vac, FP-Ar, FP-Air samples were used as photo-Fenton type catalysts and catalytic efficiencies 83%, 77%, and 62% were achieved. This work suggests a new direction for the development of an inexpensive and highly efficient catalyst for the photo-Fenton reactions under solar light.
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