Remarkable catalytic degradation of malachite green by zinc supported on hydroxyapatite encapsulated magnesium ferrite (Zn/HAP/MgFe2O4) magnetic novel nanocomposite
2020
Das, Krishna Ch | Dhar, Siddhartha S.
The present study reports the synthesis, characterization and catalytic activity of zinc/hydroxyapatite/magnesium ferrite (Zn/HAP/MgFe₂O₄) as a novel nanocomposite. The nanocomposite was characterized by powder XRD, FTIR, SEM–EDX, TEM, VSM and XPS. The presence of Zn(0) and Zn(II) in the Zn/HAP/MgFe₂O₄ was confirmed by XPS studies. The composite was applied as a heterogeneous catalyst for the degradation of malachite green in the presence as well as in the absence of H₂O₂. In the presence of the oxidant H₂O₂, 100% degradation was achieved in just 2 min while in the absence of H₂O₂ it took almost 2 h for complete degradation. The enhancement in the rate of the degradation of the dye in the presence of H₂O₂ was due to fenton and fenton-like mechanism involving the formation of reactive oxygen species, such as hydroxyl and perhydroxyl radicals (HO· and HOO·). The Zn/HAP/MgFe₂O₄ showed high stability and because of its super-paramagnetic behaviour it could be easily separated by external magnet from the reaction mixture. Kinetic studies showed that the degradation of the dye follows first order.
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