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SEM images of prepared catalysts. The different catalyst images are (a) MnFe2O4 10PVA, (b) MnFe2O4 15PVA, (c) MnFe2O4 20PVA, (d) Mn0.5Fe2.5O4 15PVA, and (e) Mn2.5Fe0.5O4 15PVA. The formation of MnxFe3-xO4 was again confirmed with energy dispersive x-ray analysis (EDX) and the results showed that the peak heights of manganese and iron varied according to the different stoichiometric ratios used in their preparation as expected.
