Photocatalytic Degradation of Rhodamine B Dye in Aqueous Suspension by ZnO and M-ZnO (M = La3+, Ce3+, Pr3+ and Nd3+) Nanoparticles in the Presence of UV/H2O2

In this study, nanoparticles of five photocatalytic systems based on pure zinc oxide and with rare earths ions M-ZnO (M = La3+, Ce3+, Pr3+ or Nd3+) calcined at 500 °C or 700 °C were synthesized and investigated as potential photocatalysts for the removal of dyes. The addition of rare earth ions caus...

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Bibliographic Details
Published in:Processes 2021-10, Vol.9 (10), p.1736
Main Authors: González-Crisostomo, José C., López-Juárez, Rigoberto, Petranovskii, Vitalii
Format: Article
Language:English
Subjects:
Catalytic activity
Cerium
Degradation
Dyes
Fourier transforms
Hydrogen peroxide
Metal ions
Nanoparticles
Nitrates
Photocatalysis
Photodegradation
Radiation
Rare earth elements
Rhodamine
Roasting
Spectrum analysis
Synthesis
Zinc oxide
Zinc oxides
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Summary:In this study, nanoparticles of five photocatalytic systems based on pure zinc oxide and with rare earths ions M-ZnO (M = La3+, Ce3+, Pr3+ or Nd3+) calcined at 500 °C or 700 °C were synthesized and investigated as potential photocatalysts for the removal of dyes. The addition of rare earth ions causes a decrease in the bandgap of ZnO; therefore, it can be well used to improve the photocatalytic properties. The photocatalytic activity of the synthesized nanoparticles was evaluated by the degradation of Rhodamine B in the presence of H2O2 under ultraviolet illumination. The results indicate that all the synthesized nanoparticles show good dye degradation efficiency. The highest degradation efficiency was 97.72% for the Ce-ZnO sample calcined at 500 °C and was achieved in 90 min with an excellent constant of the dye degradation rate k = 0.0363 min−1 following a first-order kinetic mechanism. The presence of oxychlorides as secondary phases inhibits the rate of the photocatalytic reaction.
ISSN:2227-9717
2227-9717
DOI:10.3390/pr9101736