高等学校化学学报

高等学校化学学报

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基于铈基金属有机骨架材料UIO-66-(COOH)2构建荧光法检测SO32-

龚文朋,周林楠   

  1. 黄冈师范学院化学化工学院
  • 收稿日期:2025-02-28 修回日期:2025-04-20 网络首发:2025-05-07 发布日期:2025-05-07
  • 通讯作者: 周林楠 E-mail:zhouln@hgnu.edu.cn
  • 基金资助:
    湖北省教育厅基础教学研究项目(批准号：2023473)

Fluorescent Detection of Sulfite Ions (SO32-) Based on Cerium-Functionalized Metal-Organic Framework UiO-66-(COOH)2

GONG Wenpeng, ZHOU Linnan   

  1. College of Chemistry and Chemical Engineering, Huanggang Normal University
  • Received:2025-02-28 Revised:2025-04-20 Online First:2025-05-07 Published:2025-05-07
  • Contact: ZHOU Linnan E-mail:zhouln@hgnu.edu.cn
  • Supported by:
    Supported by the Basic Education Research Project of Hubei Provincial Department of Education, China(No. 2023473)

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摘要： 构建了一种基于金属有机骨架Ce-UIO-66-(COOH)2的荧光策略，用于检测SO32-。首先通过溶剂热法，以均苯四甲酸为有机配体、Ce4+为中心离子合成了Ce-UIO-66-(COOH)2材料，并采用X射线衍射（XRD）、红外光谱（IR）、X射线光电子能谱（XPS）、扫描电子显微镜（SEM）等表征手段确认了其结构特征。在Ce-UIO-66-(COOH)2催化作用下，SO32-与苯甲酸组成的反应体系中，SO32-被催化转化为硫酸根自由基（SO4•−），进而诱导苯甲酸转化为具有荧光特性的2-羟基苯甲酸（水杨酸），由此实现SO32-的定量检测。通过荧光光谱和电子自旋共振谱（ESR）验证了该检测机理。系统考察了反应时间、温度、MOF材料用量及苯甲酸浓度等因素对检测性能的影响，在优化条件下获得40~120 mM的线性检测范围，检出限达8.3 ?M。该方法对常见无机阴离子表现出良好的抗干扰性能，成功应用于雨水和自来水样品中SO32-。

关键词: UIO-66-(COOH)2, 自由基反应, SO2, 亚硫酸盐

Abstract: A fluorescence strategy was constructed based on the metallic organic framework Ce-UIO-66-(COOH)2 was constructed to detect SO32-. Firstly, under solvothermal conditions, the Ce-UIO-66-(COOH)2 was synthesized using homophthallic acid and Ce4+ as the organic ligand and central ion. The structure was characterized by XRD, IR, XPS, SEM and EDS. Employing a reaction system using Ce-UIO-66-(COOH)2, SO32- and benzoic acid, under the catalysis of Ce-UIO-66- (COOH)2, the SO32- was conversed to sulfate radical SO4•−, and then induced benzoic acid to transform into fluorescent molecule 2-hydroxybenzoic acid (salicylic acid), which realizes the detection of SO32-. The detection mechanism was confirmed by fluorescence spectrum and ESR. The influences of time, temperature, dosages of MOF and benzoic acid were explored. Under the optimal conditions, a linear detection range was obtained as 40~120 mM, and the detection limit was 8.3 ?M. The method possesses favourable anti-interference property for common inorganic anions. Meanwhile, it was applied to the determination of SO32- in rainwater and tap water samples, the results are satisfactory.

Key words: UIO-66-(COOH)2, Radical-Mediated Reaction, Sulfur Dioxide (SO2), Sulfite Species (SO?2?)

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