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Photocatalytic Characteristics For The Nanocrystalline TiO2 Supported On Sr4Al14O25: Eu2+, Dy3+ Phosphor Beads

Hyun-Je Sung¹, Byung-Min Kim¹, Sang-Chul Jung² and Jung-Sik Kim^1*

¹Department of Materials Science and Engineering, The University of Seoul, Seoul, 130-743 Korea

²Department of Environmental Engineering, Sunchon National University, Jeonnam, 540-742 Korea

Adv. Mater. Lett., 2016, 7 (1), pp 36-41

DOI: 10.5185/amlett.2016.6106

Publication Date (Web): Dec 22, 2015

E-mail: jskim@uos.ac.kr

Full Article

Abstract

The photocatalytic behaviors of TiO₂-supported on the long lasting phosphor beads were examined. Nanocrystalline TiO₂ was coated on ellipsoidal-spherical beads of an alkaline earth aluminate phosphor, Sr₄Al₁₄O₂₅:Eu²⁺, Dy³⁺, by low pressure chemical vapor deposition (LPCVD). The photocatalytic reaction was examined by measuring the decomposition of benzene and toluene gases by gas chromatography under ultraviolet, visible light (λ> 410 nm) irradiation, as well as in the dark. The LPCVD TiO₂-coated Sr₄Al₁₄O₂₅:Eu²⁺, Dy³⁺ showed an active photocatalytic reaction under visible irradiation. The mechanisms of the photocatalytic reactivity for the TiO₂-coated Sr₄Al₁₄O₂₅:Eu²⁺, Dy³⁺ phosphor beads were discussed in terms of the crystal structure at the interface, energy band structure and phosphorescence. The coupling of TiO₂ with the Sr₄Al₁₄O₂₅:Eu²⁺, Dy³⁺ phosphor resulted in energy band bending in the junction region between TiO₂ and Sr₄Al₁₄O₂₅:Eu²⁺, Dy³⁺ phosphor, which makes the TiO₂ crystal at the interface photo-reactive under visible light irradiation. The LPCVD TiO₂-coated Sr₄Al₁₄O₂₅:Eu²⁺, Dy³⁺ phosphor beads were also photo-reactive in the dark through the light photons emitted from the Sr₄Al₁₄O₂₅:Eu²⁺, Dy³⁺ phosphor.

Keywords

Photocatalyst, TiO_2,phosphor beads, Sr₄Al₁₄O₂₅:Eu²⁺, Dy³⁺, LPCVD.

Full Article

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Photocatalytic Characteristics For The Nanocrystalline TiO2 Supported On Sr4Al14O25: Eu2+, Dy3+ Phosphor Beads

1Department of Materials Science and Engineering, The University of Seoul, Seoul, 130-743 Korea 2Department of Environmental Engineering, Sunchon National University, Jeonnam, 540-742 Korea

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¹Department of Materials Science and Engineering, The University of Seoul, Seoul, 130-743 Korea

²Department of Environmental Engineering, Sunchon National University, Jeonnam, 540-742 Korea

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