MgAl Oxide Coatings Modified with CeO<sub>2</sub> Particles Formed by Plasma Electrolytic Oxidation of AZ31 Magnesium Alloy: Photoluminescent and Photocatalytic Properties
MgAl oxide coatings composed of MgO and MgAl<sub>2</sub>O<sub>4</sub> phases were doped with CeO<sub>2</sub> particles via plasma electrolytic oxidation (PEO) of AZ31 magnesium alloy in a 5 g/L NaAlO<sub>2</sub> water solution. Subsequently, particles...
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MDPI AG
2024-03-01
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| Online Access: | https://www.mdpi.com/2075-4701/14/3/366 |
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| author | Stevan Stojadinović Nenad Radić |
| author_facet | Stevan Stojadinović Nenad Radić |
| author_sort | Stevan Stojadinović |
| collection | DOAJ |
| description | MgAl oxide coatings composed of MgO and MgAl<sub>2</sub>O<sub>4</sub> phases were doped with CeO<sub>2</sub> particles via plasma electrolytic oxidation (PEO) of AZ31 magnesium alloy in a 5 g/L NaAlO<sub>2</sub> water solution. Subsequently, particles of CeO<sub>2</sub> up to 8 g/L were added. Extensive investigations were conducted to examine the morphology, the chemical and phase compositions, and, most importantly, the photoluminescent (PL) properties and photocatalytic activity (PA) during the photodegradation of methyl orange. The number of CeO<sub>2</sub> particles incorporated into MgAl oxide coatings depends on the concentration of CeO<sub>2</sub> particles in the aluminate electrolyte. However, the CeO<sub>2</sub> particles do not significantly affect the thickness, phase structure, or surface morphology of the coatings. The PL emission spectrum of MgAl oxide coatings is divided into two bands: one in the 350–600 nm range related to structural defects in MgO, and another much more intense band in the 600–775 nm range attributed to the F<sup>+</sup> centres in MgAl<sub>2</sub>O<sub>4</sub>. The incorporated CeO<sub>2</sub> particles do not have a significant effect on the PL intensity of the band in the red spectral region, but the PL intensity of the first band increases with the concentration of CeO<sub>2</sub> particles. The PA of MgAl/CeO<sub>2</sub> oxide coatings is higher than that of pure MgAl oxide coatings. The MgAl/CeO<sub>2</sub> oxide coating developed in aluminate electrolyte with a concentration of 2 g/L CeO<sub>2</sub> particles exhibited the highest PA. The MgAl/CeO<sub>2</sub> oxide coatings remained chemically and physically stable across multiple cycles, indicating their potential for applications. |
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| spelling | doaj.art-0a3a318a28b746399302cc4060f9d70d2024-03-27T13:54:34ZengMDPI AGMetals2075-47012024-03-0114336610.3390/met14030366MgAl Oxide Coatings Modified with CeO<sub>2</sub> Particles Formed by Plasma Electrolytic Oxidation of AZ31 Magnesium Alloy: Photoluminescent and Photocatalytic PropertiesStevan Stojadinović0Nenad Radić1Faculty of Physics, University of Belgrade, Studentski trg 12-16, 11000 Belgrade, SerbiaIChTM-Department of Catalysis and Chemical Engineering, University of Belgrade, Njegoševa 12, 11000 Belgrade, SerbiaMgAl oxide coatings composed of MgO and MgAl<sub>2</sub>O<sub>4</sub> phases were doped with CeO<sub>2</sub> particles via plasma electrolytic oxidation (PEO) of AZ31 magnesium alloy in a 5 g/L NaAlO<sub>2</sub> water solution. Subsequently, particles of CeO<sub>2</sub> up to 8 g/L were added. Extensive investigations were conducted to examine the morphology, the chemical and phase compositions, and, most importantly, the photoluminescent (PL) properties and photocatalytic activity (PA) during the photodegradation of methyl orange. The number of CeO<sub>2</sub> particles incorporated into MgAl oxide coatings depends on the concentration of CeO<sub>2</sub> particles in the aluminate electrolyte. However, the CeO<sub>2</sub> particles do not significantly affect the thickness, phase structure, or surface morphology of the coatings. The PL emission spectrum of MgAl oxide coatings is divided into two bands: one in the 350–600 nm range related to structural defects in MgO, and another much more intense band in the 600–775 nm range attributed to the F<sup>+</sup> centres in MgAl<sub>2</sub>O<sub>4</sub>. The incorporated CeO<sub>2</sub> particles do not have a significant effect on the PL intensity of the band in the red spectral region, but the PL intensity of the first band increases with the concentration of CeO<sub>2</sub> particles. The PA of MgAl/CeO<sub>2</sub> oxide coatings is higher than that of pure MgAl oxide coatings. The MgAl/CeO<sub>2</sub> oxide coating developed in aluminate electrolyte with a concentration of 2 g/L CeO<sub>2</sub> particles exhibited the highest PA. The MgAl/CeO<sub>2</sub> oxide coatings remained chemically and physically stable across multiple cycles, indicating their potential for applications.https://www.mdpi.com/2075-4701/14/3/366plasma electrolytic oxidationphotocatalysisphotoluminescenceMgOMgAl<sub>2</sub>O<sub>4</sub>CeO<sub>2</sub> |
| spellingShingle | Stevan Stojadinović Nenad Radić MgAl Oxide Coatings Modified with CeO<sub>2</sub> Particles Formed by Plasma Electrolytic Oxidation of AZ31 Magnesium Alloy: Photoluminescent and Photocatalytic Properties Metals plasma electrolytic oxidation photocatalysis photoluminescence MgO MgAl<sub>2</sub>O<sub>4</sub> CeO<sub>2</sub> |
| title | MgAl Oxide Coatings Modified with CeO<sub>2</sub> Particles Formed by Plasma Electrolytic Oxidation of AZ31 Magnesium Alloy: Photoluminescent and Photocatalytic Properties |
| title_full | MgAl Oxide Coatings Modified with CeO<sub>2</sub> Particles Formed by Plasma Electrolytic Oxidation of AZ31 Magnesium Alloy: Photoluminescent and Photocatalytic Properties |
| title_fullStr | MgAl Oxide Coatings Modified with CeO<sub>2</sub> Particles Formed by Plasma Electrolytic Oxidation of AZ31 Magnesium Alloy: Photoluminescent and Photocatalytic Properties |
| title_full_unstemmed | MgAl Oxide Coatings Modified with CeO<sub>2</sub> Particles Formed by Plasma Electrolytic Oxidation of AZ31 Magnesium Alloy: Photoluminescent and Photocatalytic Properties |
| title_short | MgAl Oxide Coatings Modified with CeO<sub>2</sub> Particles Formed by Plasma Electrolytic Oxidation of AZ31 Magnesium Alloy: Photoluminescent and Photocatalytic Properties |
| title_sort | mgal oxide coatings modified with ceo sub 2 sub particles formed by plasma electrolytic oxidation of az31 magnesium alloy photoluminescent and photocatalytic properties |
| topic | plasma electrolytic oxidation photocatalysis photoluminescence MgO MgAl<sub>2</sub>O<sub>4</sub> CeO<sub>2</sub> |
| url | https://www.mdpi.com/2075-4701/14/3/366 |
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