Chem. J. Chinese Universities ›› 2024, Vol. 45 ›› Issue (8): 20240069.doi: 10.7503/cjcu20240069

• Analytical Chemistry • Previous Articles     Next Articles

Fluorescent Detection of Hydrogen Sulfide Using Metal-organic Framework CAU-10-NH-DNBA Functionalized with 3,5-Dinitrobenzoic Acid

GONG Wenpeng(), ZHOU Linnan   

  1. College of Chemistry and Chemical Engineering,Huanggang Normal University,Huanggang 438000,China
  • Received:2024-02-04 Online:2024-08-10 Published:2024-05-17
  • Contact: GONG Wenpeng E-mail:1539380469@qq.com
  • Supported by:
    the Hubei Provincial Teaching Reform Research Project for Undergraduate Universities, China(2023473);the Major Cultivation Project of Huanggang Normal University, China(202211104);the Huanggang Normal University Doctoral Research and Innovation Fund, China(2042021036)

Abstract:

Fluorescent probe based on 3,5-dinitrobenzoic acid functionalized metal-organic framework CAU-10-NH-DNBA was designed for the direct detection of H2S. Firstly, Metal-organic framework CAU-10-NH2 was synthesized using AlCl3 and 5-amino-m-phthalic acid as raw materials under solvothermal conditions. Subsequently, CAU-10-NH-DNBA was synthesized in an aqueous solution using CAU-10-NH2 and 3,5-dinitrobenzoic acid(DNBA) as raw materials under the action of coupling agents 1-(3-dimethylaminopropyl)-3-ethylcarbimide(EDC) and N-hydroxy-succinamide(NHS). The excitation and emission wavelengths of the prepared CAU-10-NH-DNBA are 320 and 412 nm, respectively. The product was characterized by infrared spectroscopy, X-ray diffraction, solid state NMR, X-ray photoelectron spectroscopy and scanning electron microscopy. The influence of pH value, time and temperature on the detection effect was explored. Under the optimal conditions, the detection limit of H2S was 2.43 μmol/L, and the linear range was 3.9—62.5 μmol/L. The CAU-10-NH-DNBA has the advantages of high sensitivity and selectivity, and can be applied to the determination of H2S in human serum samples with a recovery range of 94.5%—96.1%.

Key words: Metal-organic framework, 3, 5-Dinitrobenzoic acid, Functionalization, Fluorescent detection, Hydrogen sulfide

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