Influence of Fe3O4 and CTABr on the Rate of Degradation of Methylene Blue by H2O2

¹Department of Applied Chemistry, Z.H. College of Engineering and Technology, Aligarh Muslim University, Aligarh 202002, India

²Department of Chemistry, King Abdul Aziz University, Jeddah, Saudi Arabia

Adv. Mater. Lett., 2021, 12 (2), 21021602

DOI: 10.5185/amlett.2021.021602

Publication Date (Web): Dec 16, 2020

Copyright © IAAM-VBRI Press

E-mail: drrafiquee@gmail.com

Abstract

The kinetics of the oxidation of methylene blue (MB) by H₂O₂ in the presence of iron oxide nanoparticles has been studied. The nanoparticles of iron oxide (Fe₃O₄) were synthesized and characterized physico-chemical techniques. The XRD studies showed its crystalline nature. The VSM study was carried out to determine the values of the magnetic saturation parameter ~ 40.00 emu/g. The particle were of spherical shape with particle size distribution centered at 12 ± 2 nm. The FT-IR spectra indicated the presence of peaks at 585 cm^-1 and 459 cm^-1 due to Fe-O bond vibrations. The peak at 3424 cm^-1 was assigned to the O-H stretching vibration. The H-O-H bending appeared at 1631 cm^-1. The Fe₃O₄ nanoparticles enhanced the rate of degradation of MB. The oxidation rate increased with the increase in Fe₃O₄. At pH 3, the maximum rate of oxidation of MB was observed. The rate of reaction increased with the increase in [H₂O₂] in the absence of Fe₃O₄. But in the presence of Fe₃O₄, the rate constant versus [H₂O₂] showed peaked behaviour. The CTABr increased the rate of oxidation of MB by H₂O₂ in the presence of Fe₃O₄ nanoparticles.

Keywords

Fe₃O₄ magnetic nanoparticles, co-precipitation method, methylene blue, degradation, waste water treatment.