一种锌金属有机骨架材料对Hg~(2+)检测的应用研究
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摘要
以2,5-呋喃二甲酸(H_2FDC)和六水合硝酸锌为原料,N,N-二甲基甲酰胺和水为混合溶剂合成了一种锌金属有机骨架材料{[Zn(FDC)]·H_2O}n(Zn-MOF)。该材料在350 nm激发波长下,于470 nm处有最强的荧光发射峰。考察了食品中常见15种不同金属离子对该材料荧光强度的影响,发现Hg~(2+)能选择性地使该材料产生荧光猝灭现象。此外,还探讨了Hg~(2+)的浓度、浸泡时间的影响。结果表明,该锌金属有机骨架材料对Hg~(2+)具有高度的选择性传感功能,这一特性可以应用于食物中Hg~(2+)残留的检测,以该Zn-MOF材料作为荧光探针用荧光光谱法可以高效检测Hg~(2+)。
A zinc metal-organic framework material,{ [Zn(FDC) ]· H_2O}n(Zn-MOF),was synthesized with 2,5-furandicarboxylic acid(H_2FDC) 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 Hg~(2+)could selectively quench the fluorescence of the material. In addition,the effects of different Hg~(2+)concentrations,different soaking times and Hg~(2+)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 Hg~(2+),which could be utilized in the detection of Hg~(2+)residue in food. Hg~(2+)could be efficiently detected by fluorescence spectroscopy with this Zn-MOF material as a fluorescent probe.
A zinc metal-organic framework material,{ [Zn(FDC) ]· H_2O}n(Zn-MOF),was synthesized with 2,5-furandicarboxylic acid(H_2FDC) 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 Hg~(2+)could selectively quench the fluorescence of the material. In addition,the effects of different Hg~(2+)concentrations,different soaking times and Hg~(2+)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 Hg~(2+),which could be utilized in the detection of Hg~(2+)residue in food. Hg~(2+)could be efficiently detected by fluorescence spectroscopy with this Zn-MOF material as a fluorescent probe.
引文
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