Study on Hg2+ Detection Using a Zinc Metal-Organic Framework Material

KeyWord:zinc metal organic framework material£¨Zn-MOF£©  fluorescence spectrometry  Hg2+  selective sensing

Abstract:

      A zinc metal-organic framework material,{£ÛZn£¨FDC£©£Ý¡¤ H2O}n£¨Zn-MOF£©,was synthesized with 2,5 furandicarboxylic acid£¨H2FDC£© and zinc nitrate hexahydrate as raw materials,and N,N dimethylformamide and water as the mixed solvent.The fluorescent properties of the material were characterized,and the results showed that the strongest fluorescence emission peak occurred at 470 nm when using an excitation wavelength of 350 nm.The effects of 15 metal ions in food on fluorescence intensity of the material were investigated.It was found that Hg2+ could selectively quench the fluorescence of the material.In addition,the effects of different Hg2+ concentrations,different soaking times and Hg2+ on the sensitivity of fluorescence quenching were also investigated.The results showed that the zinc metal-organic framework material has a highly selective sensing ability toward Hg2+,which could be utilized in the detection of Hg2+ residue in food.Hg2+ could be efficiently detected by fluorescence spectroscopy with this Zn-MOF material as a fluorescent probe.