Synthesis and characterization of lanthanum-doped magnetite and its photocatalytic application in the degradation of methyl orange.
Keywords:
Chemical co-precipitation, Magnetite, Methyl orange, Nanoparticles, PhotocatalysisAbstract
In this work, the structural, morphological, magnetic, and photocatalytic properties of magnetite nanoparticles doped with lanthanum were studied. Magnetic nanoparticles with the general formula LaxFe3-xO4 (where x = 0.0, 0.2, and 0.4 mol%) were synthesized by inverse chemical co-precipitation. X-ray diffraction studies show that the nanoparticles have an inverse spinel-type cubic crystalline structure and that the diffraction peaks are shifted towards smaller 2θ angles, indicating doping of the nanoparticles. Studies using vibrating sample magnetometry show that the nanoparticles exhibit close to superparamagnetic behavior; undoped magnetite presented a saturation magnetization of 61.80 emu/g that decreases in relation to the amount of doping to 28.56 emu/g. According to the morphological analysis using transmission electron microscopy, the synthesized nanoparticles present a hemispherical shape with a size range between 6-16 nm for undoped magnetite and an irregular morphology and sizes between 12-36 nm for the doped magnetite. Photocatalysis studies demonstrated that lanthanum-doped magnetite nanoparticles degraded methyl orange up to 85% in 120 min of treatment.
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