Enhanced Photodecomposition Performance of (TiO2-CeO2) Composite Supported on Sr4Al14O25:Eu,Dy Long-Persistent Phosphor

Ji-Hyeon Kim; Jung-Sik Kim

doi:10.3740/MRSK.2025.35.8.390

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2025 Vol.35, Issue 8 Preview Page

Research Paper

Enhanced Photodecomposition Performance of (TiO₂-CeO₂) Composite Supported on Sr₄Al₁₄O₂₅:Eu,Dy Long-Persistent Phosphor (TiO₂-CeO₂)/Sr₄Al₁₄O₂₅:Eu,Dy 이종 접합 광촉매 복합소재의 광분해 성능 향상

27 August 2025. pp. 390-398

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Abstract

This study prepared a (TiO₂-CeO₂)/Sr₄Al₁₄O₂₅: Eu²⁺,Dy³⁺ heterojunction photocatalyst by coating (TiO₂-CeO₂) nanoparticles on a Sr4Al14O25:Eu,Dy phosphor substrate using a hydrothermal reaction method. The fabricated (TiO₂-CeO₂)/Sr₄Al₁₄O₂₅: Eu²⁺,Dy³⁺ composites were characterized with X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray photo electron spectroscopy (XPS), UV-visible diffuse reflectance spectroscopy (UV/Vis DRS), Brunauer-Emmett-Teller (BET), and Raman spectroscopy. The photocatalytic performance of the (TiO₂-CeO₂)/Sr₄Al₁₄O₂₅: Eu²⁺,Dy³⁺ composites was investigated through the decomposition of toluene gas for various ratios of TiO₂ to CeO₂ (3:7, 5:5, and 7:3) and heat treatment ranging from 300 to 700 °C. The coupling between (TiO₂-CeO₂) and the highly persistent Sr₄Al₁₄O₂₅:Eu²⁺,Dy³⁺ phosphor reduced the energy band gap and enhanced visible light absorption. In particular, the 5:5 ratio of TiO₂ to CeO₂ on Sr₄Al₁₄O₂₅:Eu²⁺,Dy³⁺ showed excellent photocatalytic performance, decomposing over 85 % of the toluene gas within 150 min even under visible-light irradiation. The results suggest that the CeO₂ particles might increase the specific surface area, and effectively suppress the recombination of electrons and holes generated from TiO₂, thereby enhancing the photocatalytic reactivity.

Keywords

TiO₂

CeO₂

Sr₄Al₁₄O₂₅:(Eu,Dy)

heterojunction photocatalyst

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Information

Publisher :Materials Research Society of Korea
Publisher(Ko) :한국재료학회
Journal Title :Korean Journal of Materials Research
Journal Title(Ko) :한국재료학회지
Volume : 35
No :8
Pages :390-398
Received Date : 2025-07-25
Revised Date : 2025-08-06
Accepted Date : 2025-08-07
DOI :https://doi.org/10.3740/MRSK.2025.35.8.390

Korean Journal of Materials Research ISSN:1225-0562(Print) 2287-7258(Online) 한국재료학회지

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