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硅酸盐通报 ›› 2026, Vol. 45 ›› Issue (5): 1790-1800.DOI: 10.16552/j.cnki.issn1001-1625.2025.1054

• 功能材料 • 上一篇    下一篇

基于铕金属有机框架封装Cs3Bi2Br9量子点的土霉素比率荧光检测

郑佳红(), 郭康()   

  1. 长安大学材料科学与工程学院,西安 710061
  • 收稿日期:2025-10-29 修订日期:2026-01-26 出版日期:2026-05-15 发布日期:2026-06-10
  • 通信作者: 郑佳红,副教授。E-mail: jhzheng@chd.edu.cn
  • 作者简介:郭 康(2001—),男,硕士研究生。主要从事荧光传感器的研究。E-mail: 1784360960@qq.com
  • 基金资助:
    陕西省重点研发项目(2024GX-YBXM-384);大学生创新创业训练计划(S202510710379);大学生创新创业训练计划(X202510710607)

Oxytetracycline Ratio Fluorescence Detection Based on Europium Metal-Organic Framework Encapsulated Cs3Bi2Br9 Quantum Dots

ZHENG Jiahong(), GUO Kang()   

  1. School of Materials Science and Engineering,Chang’an University,Xi’an 710061,China
  • Received:2025-10-29 Revised:2026-01-26 Published:2026-05-15 Online:2026-06-10

摘要:

土霉素(OTC)残留的特异性检测对食品安全和环境监测具有重要意义,快速特异性测定环境中的OTC仍然是一项挑战。本文将Cs3Bi2Br9封装在Eu金属有机框架(Eu-MOF)中,构建比率荧光传感器Cs3Bi2Br9@Eu-MOF用于OTC的检测。结果表明,采用无水乙醇作为反溶剂,在油浴温度60 ℃和pH=7的环境下制备得到的传感器性能最佳。传感研究机制表明,随着OTC浓度的增加,在0~16 μmol·L-1,由于内滤效应,Cs3Bi2Br9@Eu-MOF在424 nm处的蓝色荧光发射峰强度逐渐减弱,而由于OTC对Eu3+的敏化作用,在616 nm处出现了红色荧光发射峰,且强度逐渐增强。基于此比率信号(F616/F424),Cs3Bi2Br9@Eu-MOF比率荧光传感器对OTC表现出高灵敏度和低检测限,并具有优良选择识别能力和抗干扰能力。

关键词: Cs3Bi2Br9, Eu-MOF, 土霉素, 比率荧光, 水稳定性, 无铅

Abstract:

The specific detection of oxytetracycline (OTC) residues is of great significance for food safety and environmental monitoring. The rapid and specific determination of OTC in the environment remains a challenge. In this study, Cs3Bi2Br9 was encapsulated in an Eu-based metal-organic framework (Eu-MOF) to construct a ratio fluorescence sensor, Cs3Bi2Br9@Eu-MOF, for the detection of OTC. The results show that the sensor exhibits optimal performance when anhydrous ethanol is used as the anti-solvent and the preparation is carried out under an oil bath temperature of 60 ℃ and pH=7. The sensing mechanism indicates that, with increasing OTC concentration in the range of 0~16 μmol·L-1, the blue fluorescence emission peak intensity of Cs3Bi2Br9@Eu-MOF at 424 nm gradually decreases due to the inner filter effect, while a red fluorescence emission peak at 616 nm appears and its intensity gradually increases due to the sensitization of Eu3+ by OTC. Based on the ratio signal (F616/F424), the Cs3Bi2Br9@Eu-MOF ratio fluorescence sensor demonstrates high sensitivity and a low detection limit for OTC, and excellent selectivity and anti-interference ability.

Key words: Cs3Bi2Br9, Eu-MOF, oxytetracycline, ratio fluorescence, water stability, lead-free

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