Remarkable catalytic degradation of malachite green by zinc supported on hydroxyapatite encapsulated magnesium ferrite (Zn/HAP/MgFe2O4) magnetic novel nanocomposite
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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.
The authors are highly grateful to the Department of Chemistry, NIT, Silchar and G. C. College, Silchar, Assam, India, for providing infrastructure to carry out the research work. The authors would also like to offer their sincere thanks to CIF, NIT, Silchar, Assam; STIC, Cochin, Kerala; SAIC, Tezpur University, Assam and IIT, Guwahati and IIT Roorkee for providing analytical facilities.
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