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在乙醇和乙二醇混合溶剂中,180℃条件下,反应12h,用溶剂热法,成功制备了LaF3:Ce3+/Tb3+晶体(PDF 72-1435)。用X射线衍射仪对材料进行了表征。并用聚丙烯酸(PAA)对LaF3:Ce3+/Tb3+进行了功能化,红外吸收光谱显示LaF3:Ce3+/Tb3+表面成功修饰羧基(—COOH)。COOH—LaF3:Ce3+/Tb3+功能化材料为供体,汞离子(Ⅱ)为受体,研究了体系的荧光共振能量转移(FRET)。在最佳条件下,功能化荧光材料的荧光强度和汞离子(Ⅱ)的浓度(0.20~10.0μg/mL)呈线性关系,线性方程为ΔF=98.451-3.003c,检测限为0.035μg/mL,相关系数R=0.998 9,相对标准偏差(RSD)为4.8%(n=7)。并成功用于水样中汞的测定。
LaF3: Ce3 + / Tb3 + crystals (PDF 72-1435) were successfully prepared by solvothermal method in a mixture of ethanol and ethylene glycol at 180 ℃ for 12h. The materials were characterized by X-ray diffractometer. LaF3: Ce3 + / Tb3 + was functionalized with polyacrylic acid (PAA). The infrared absorption spectra showed that the carboxyl group (-COOH) was successfully modified on the surface of LaF3: Ce3 + / Tb3 +. The COOH-LaF3: Ce3 + / Tb3 + functionalized materials were used as donors and Hg (Ⅱ) as acceptor. The fluorescence resonance energy transfer (FRET) of the system was studied. Under optimal conditions, the fluorescence intensity of functionalized fluorescent material has a linear relationship with the concentration of mercury ion (0.20 ~ 10.0μg / mL), the linear equation is ΔF = 98.451-3.003c, the detection limit is 0.035μg / mL , The correlation coefficient R = 0.998 9, and the relative standard deviation (RSD) was 4.8% (n = 7). And successfully used in the determination of mercury in water samples.