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Enhanced ultraviolet light driven photocatalytic activity of ZnO particles incorporated by plasma electrolytic oxidation into Al2O3 coatings co-doped with Ce3+

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2020
Authors
Stojadinović, Stevan
Radić, Nenad
Tadić, Nenad
Vasilić, Rastko
Grbić, Boško
Article (Published version)
,
Elsevier
Metadata
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Abstract
This paper presents a new method for improvement of ultraviolet light driven photocatalytic activity of ZnO by immobilizing ZnO particles into Al2O3:Ce3+ coatings which emit intense radiation in the near ultraviolet region when excited by middle ultraviolet radiation. When Al2O3:Ce3+/ZnO coatings are illuminated by ultraviolet light in photocatalytic reactor, emitted ultraviolet radiation originating from Ce3+ ions synergistically participates in photocatalytic reactions on ZnO. Al2O3:Ce3+/ZnO coatings were formed by plasma electrolytic oxidation of aluminum in electrolyte containing 2 g/L of ZnO particles and up to 8 g/L of CeO2 particles. Structural, optical, photoluminescent, and photocatalytic properties of formed surface coatings were examined. All formed coatings feature virtually the same thickness, morphology, phase composition, and absorption properties. Concentration of incorporated Ce3+ ions into Al2O3 host and concentration of immobilized ZnO particles are the only paramet...ers by which the coatings differ from each other resulting in difference in photocatalytic activity. Al2O3:Ce3+/ZnO coatings show better photodegradation of methyl orange with respect to Al2O3/ZnO coatings. The best photocatalytic activity is observed for the coating formed in electrolyte containing 4 g/L of CeO2 particles.

Keywords:
Photocatalysis / ZnO / Plasma electrolytic oxidation / Ce3+ / Al2O3
Source:
Optical Materials, 2020, 101, 109768-
Publisher:
  • Elsevier B.V
Projects:
  • Ministry of Education, Science and Technological Development, Republic of Serbia, Grant no. 451-03-68/2020-14/200026 (University of Belgrade, Institute of Chemistry, Technology and Metallurgy - IChTM) (RS-200026)
  • nfo:eu-repo/grantAgreement/MESTD/inst-2020/200162/RS//

DOI: 10.1016/j.optmat.2020.109768

ISSN: 0925-3467

WoS: 000527936300057

Scopus: 2-s2.0-85079647470
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URI
https://cer.ihtm.bg.ac.rs/handle/123456789/3761
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