Abstract
A facile method of synthesis of cobalt ferrite (CoFe2O4) and nickel ferrite (NiFe2O4) nanoparticles (NPs) was developed using urea as a hydroxylating agent and Paederia foetida Linn. (family: Rubiaceae) leaf extract as a bio-template. The synthesised ferrite NPs were characterised in a detailed manner by powder X-ray diffraction (XRD), transmission electron microscopy, Fourier transform-infrared spectroscopy and vibrating sample magnetometer analysis. The XRD patterns revealed the formation of cubic face-centred phase for both CoFe2O4 and NiFe2O4 NPs. These quasi-spherical particles of CoFe2O4 and NiFe2O4 were shown to have sizes in the range of 10–80 and 5–50 nm, respectively. The photocatalytic activity of metal ferrites was evaluated in H2O2 assisted oxidative degradation of methylene blue (MB) and rhodamine B (RhB) under irradiation of solar light. Both metal ferrite photocatalysts exhibited pronounced activity in degradation of MB and RhB, respectively, but relatively higher activity was observed for NiFe2O4. After completion, the catalysts were recovered using an external magnet. Recycling of these recovered catalysts up to five times showed no noticeable change in the efficiency.
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