VISIBLE LIGHT ACTIVE FLUORITE-TYPE NANOCOMPOSITES FORMED IN THE CeO2-La2O3-Dy2O3 SYSTEM
DOI:
https://doi.org/10.15421/jchemtech.v32i4.311116Keywords:
nanocomposite, CeO2-La2O3-Dy2O3, fluorite-type structure, visible light photocatalytic activity, Malachite Green, dye destructionAbstract
Fluorite-type nanocomposite materials with a content of 95–60 mol.% CeO2, 10–20 mol.% La2O3, and 5–20 mol.% Dy2O3 were obtained by the chemical co-precipitation method using REЕ (rare earth elements) nitrate solutions. The primary particle size (coherent scattering region) increased from 11.3 to 26.5 nm when the calcination temperature increased from 600 to 800 °C. The highest photocatalytic activity in the destruction of Malachite green dye under the influence of visible light was shown by the sample with the composition of CeO2 (80 mol.%) - La2O3 (10 mol.%) - Dy2O3 (10 mol.%), thermally treated at 600 °C for 5 hours. The results of the experimental study showed that at the initial concentration of the Malachite green (MG) solution of 20 mg/dm3 under the influence of visible light for 1 hour, its residual concentration was only 0.45 mg/dm3, and the degree of decolorization of the solution reached 98 %. It is assumed that nanocomposites based on a CeO2-La2O3-Dy2O3 solid solution with a fluorite-type structure can be used to create effective photocatalysts designed for the destruction of cationic dyes in an aqueous medium.
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