Chem. J. Chinese Universities ›› 2025, Vol. 46 ›› Issue (8): 20250108.doi: 10.7503/cjcu20250108

• Analytical Chemistry • Previous Articles     Next Articles

Cataluminescent Sensing of 1,2-Epoxypropane Using Dy₂O₃/La₂O₃ Rare Earth Composite Oxides

ZHANG Yuwei, DU Yihao, ZHANG Yantu, LI Yunyun()   

  1. College of Chemistry and Chemical Engineering,Yan'an University,Yan’an,716000,China
  • Received:2025-04-11 Online:2025-08-10 Published:2025-06-03
  • Contact: LI Yunyun E-mail:liyun233@126.com
  • Supported by:
    the Project of the Department of Science and Technology of Shannxi Province, China(2024JC-YBQN-0120);the Doctoral Research Initiation Project of Yan’an University, China(YAU202303811);the College Student Innovation and Entrepreneurship Training Program Project of Yan’an University, China(D2024247);the Yan’an University Campus level Scientific Research Program Project of Yan’an University, China(YDQ22019-20);the National Natural Science Foundation of China(52063029)

Abstract:

In this study, we developed a high-performance cataluminescence(CTL) sensing platform based on Dy₂O₃/La₂O₃ rare-earth composite oxides for specific detection of 1,2-epoxypropane(PO). Through optimized composition regulation of the rare-earth oxides, the Dy₂O₃/La₂O₃ heterointerface demonstrated remarkable synergistic catalytic effects, achieving both high sensitivity(LOD=82.8 μmol/L) and exceptional selectivity(10-fold higher response to PO than interferents). Under optimal conditions(detection wavelength: 575 nm; temperature: 360 ℃; gas flow rate: 320 mL/min), the CTL intensity showed excellent linear correlation with PO concentration(y=701.25x+15085.19, R²=0.9969), with an ultralow detection limit(8.28×10⁻⁵ mol/L). The sensing system exhibited outstanding stability(RSD<3% over 11 cycles) and satisfactory recovery rates(96-108%). A "photoexcitation-oxygen activation-selective oxidation-characteristic luminescence" sensing mechanism was proposed. This work provides a novel strategy for developing rare-earth oxide-based sensing materials and offers an innovative solution for environmental VOC monitoring.

Key words: Rare-earth composite oxides, Interfacial synergistic effect, Propylene oxide detection, Cataluminescence sensor, Gas-sensing reaction mechanism

CLC Number: 

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