Synthesis of samarium metal-organic framework material and its fluorescence sencing of bismuth(Ⅲ) in water
WANG Nana1, GAO Loujun1, CHAI Hongmei*1, REN Yixia1, ZHANG Gangqiang2
1. Shaanxi Provincial Key Laboratory of Chemical Reaction Engineering,College of Chemistry and Chemical Engineering, Yan′an University, Yan′an 716000,China; 2. Xinjiang Xuanli Environmental Protection Energy Co.,Ltd.,Hami 839000,China
Abstract：A new samarium metal-organic framework (Sm-MOF) material of [Sm2(CPA)3(H2O)4]n was prepared by hydrothermal method with samarium nitrate as the metal source and 6-(4′-carboxyphenyl) pyridinic acid (H2CPA) as the ligand. The structure and basic physicochemical properties of this material were characterized by single crystal X-ray diffraction (SXRD), powder X-ray diffraction (PXRD), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), elemental analysis (EA), fourier transform infrared spectroscopy (FTIR) and fluorescence spectrometry (FS). The results showed that the material had a three-dimensional porous structure with hexagonal prism morphology, high phase purity and good thermal stability. The fluorescence analysis showed that the material had a unique fluorescence response to Bi3+ ions in aqueous solution. Based on this, a fluorescence sensing detection method of Bi3+ in water was established. The linear range of Bi3+ was 20-90 μmol/L, and the limit of detection was 1.06 μmol/L. The proposed method was applied to the detection of Bi3+ ions in actual water samples. The relative standard deviations (RSD, n=8) were between 2.6% and 3.4%, and the recoveries were between 98% and 100%.
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