Investigation of photochemical properties of La-Er/CeO2 and La-Y/ CeO(2 )composites


Kirkgecit R., ÖZLÜ TORUN H., KILIÇ DOKAN F. , ÖZTÜRK E.

JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY, vol.423, 2022 (Journal Indexed in SCI) identifier

  • Publication Type: Article / Article
  • Volume: 423
  • Publication Date: 2022
  • Doi Number: 10.1016/j.jphotochem.2021.113602
  • Title of Journal : JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
  • Keywords: Rare earth, Oxygen vacancy, Raman spectroscopy, Dye degradation, Photoluminescence, HOST-SENSITIZED PHOSPHORESCENCE, PHOTOLUMINESCENCE PROPERTIES, RED PHOSPHORS, X-RAY, MN4+, NANOPARTICLES, RAMAN, EU3+, LUMINESCENCE, DEGRADATION

Abstract

In this study, CeO2 and composites of (La, Er)- and (La,Y)- codoped CeO2 were prepared via the sol-gel method and characterized by X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) analysis, field-emission scanning electron microscopy (FESEM), scanning transmission electron microscopy (STEM), Fourier-transform infra-red spectroscopy (FT-IR), energy dispersive X-ray spectroscopy (EDX), Raman spectroscopy, UV/vis absorption, and photoluminescence spectra, respectively. The XRD results indicated that the undoped CeO2 and the compounds were well crystallized with a cubic structure. The FESEM images illustrated that the average particle size was in the range of 10-20 mu m. The synthesized compounds were used to degrade methylene blue dye. The variance in degradation percentages was due to the oxygen vacancies created by doping La, Er, and Y into the CeO2 lattice structure. The absorption spectra indicated that CeO2 and CeO2:La3+ (Er3+, Y3+) had different band gaps that varied between 3.03 and 2.58 eV. In addition, the (La,Y)-doped CeO2 showed predominantly red emissions, whereas the (La, Er)-doped CeO2 exhibited predominantly green emissions.