Ln-MOFs的制备及其对铀酰离子的吸附和检测

Synthesis of Ln-MOFs and its adsorption and fluorescence recognition of uranyl ions

采用水热合成法制备一种稀土掺杂的金属有机骨架材料(MOFs) Tb3+-Ui O-66-(COOH)2(Ln-MOFs),采用扫描电镜(SEM)、红外光谱(IR)和荧光光谱(FL)对材料进行表征分析。结果表明:在最佳铀吸附条件为p H=7,吸附时间为10 h,温度为313 K,U的初始浓度60 mg/L条件下,吸附剂对铀酰离子的吸附量为333.13mg/g;该材料也可用于荧光检测U(Ⅵ),最佳激发波长和发射波长分别为300 nm和540 nm,在200μg/L至10 mg/LUO22(10)浓度范围内具有良好的线性关系,线性相关系数r=0.9924,检测限(LOD)为232.7μg/L,该方法操作简便、选择性强、灵敏度较高。

A luminescent MOFs material Tb3+-Ui O-66-(COOH)2(Ln-MOFs) was prepared by hydrothermal synthesis.The structure of Tb3+-Ui O-66-(COOH)2 was characterized by Fourier transform infrared (FT-IR),scanning electron microscopy (SEM) and fluorescence spectrum (FL).The results show that the best conditions of uranium adsorption are as follows:p H is 7,adsorption time is 10 h,temperature is 313 K,the initial U(Ⅵ)concentration is 60 mg/L,the maximum adsorption capacity of U(Ⅵ) is 333.13 mg/g.The material can also be used to detect U(Ⅵ) with fluorescence at the same time.The optimal excitation and emission wavelengths are 300and 540 nm,respectively.There is a good linear relationship in the concentration range of 200μg/L to 10 mg/L UO22(10) with a correlation coefficient of 0.9924.Limit of detection (LOD) is 232.7μg/L.The proposed method is simple,selective and sensitive.