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Photocatalytic characteristics for the nanocrystalline TiO2 supported on Sr4Al14O25:Eu2+, Dy3+ phosp

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 Kim1*

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

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, TiO2,phosphor beads, Sr4Al14O25:Eu2+, Dy3+, LPCVD.

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