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