(1. 南华大学 铀矿冶生物技术国防重点学科实验室,衡阳 421001;
2. 南华大学 公共卫生学院,衡阳 421001)
摘 要: 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+-UiO-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pH=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333.13 mg/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200 μg/L至10 mg/L 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232.7 μg/L,该方法操作简便、选择性强、灵敏度较高。
关键字: 铀;金属有机骨架材料;吸附;荧光识别
(1. Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang 421001, China;
2. College of Public Health, University of South China, Hengyang 421001, China)
Abstract:A luminescent MOFs material Tb3+-UiO-66-(COOH)2(Ln-MOFs) was prepared by hydrothermal synthesis. The structure of Tb3+-UiO-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: pH 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 300 and 540 nm, respectively. There is a good linear relationship in the concentration range of 200 μg/L to 10 mg/L with a correlation coefficient of 0.9924. Limit of detection (LOD) is 232.7 μg/L. The proposed method is simple, selective and sensitive.
Key words: uranyl ions; MOFs; adsorption; fluorescence recognition