Chem. J. Chinese Universities ›› 2025, Vol. 46 ›› Issue (7): 20250062.doi: 10.7503/cjcu20250062

• Analytical Chemistry • Previous Articles     Next Articles

Fluorescent Detection of Sulfite Ions(SO23 -) 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,Huanggang 438000,China
  • Received:2025-02-28 Online:2025-07-10 Published:2025-05-07
  • Contact: ZHOU Linnan E-mail:1539380469@qq.com;zhouln@hgnu.edu.cn
  • Supported by:
    the Basic Education Research Project of Hubei Provincial Department of Education, China(2023473)

Abstract:

A fluorescence strategy was constructed based on the metallic organic framework Ce-UIO-66-(COOH)2 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 X-ray diffraction(XRD), infrared spectroscopy(IR), X-ray photoelectron spectroscopy(XPS), scanning electron microscope(SEM) and energy dispersive spectroscopy(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 μmol/L, and the detection limit was 8.3 μmol/L. The method possesses the 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

CLC Number: 

TrendMD: