摘要
以甘薯为碳源,采用水热法制备了蓝色荧光水溶性碳点(CDs),并通过傅里叶变换红外光谱、紫外可见光谱和荧光光谱法对该碳点的性质进行了研究.研究结果显示,碳点溶液具有良好的稳定性,CDs表面存在羟基、羧基等亲水性官能团.碳点的最大激发波长和发射波长分别为390 nm和486 nm,且碳点具有典型的激发波长依赖性.考察pH对CDs荧光强度的影响显示,CDs荧光强度在pH为2.0~6.8范围内无明显变化.基于Fe3+能够选择性地猝灭CDs荧光的特性,建立了一种利用CDs检测实际水样品中Fe3+的方法.该方法的线性范围为10~1 670μmol/L,相关系数(R2)为0.994 4,检出限为5.64μmol/L;在加标样品中, Fe3+的加标回收率为94%~104%,RSD<2.4%.
Blue fluorescent water-soluble carbon dots(CDs) were prepared by hydrothermal method using sweet potato as carbon source. The properties of the carbon dots were studied by Fourier transform infrared spectroscopy, ultraviolet visible spectroscopy and fluorescence spectroscopy. The results show that the carbon dots solution has good stability, and hydrophilic functional groups such as hydroxyl groups and carboxyl groups existed on the surface of CDs. The maximum excitation and emission wavelengths of the carbon dots are 390 nm and 486 nm, respectively, and the carbon dots have a typical excitation wavelength dependence. The effect of pH on the fluorescence intensity of CDs was observed. The fluorescence intensity of CDs showed no significant change in the range of pH 2.0-6.8. Based on the ability of Fe3+ to selectively quench the fluorescence of CDs, a method for detecting Fe3+ in actual water samples using CDs was established. The linear range of the method is 10-1 670 μmol/L, the correlation coefficient(R2) is 0.994 4, and the detection limit is 5.64 μmol/L. In the spiked samples, the recoveries of Fe3+ are 94%-104%, RSD <2.4%.
作者
孙颖
金东日
SUN Ying;JIN Dongri(College of Science,Yanbian University,Yanji 133002,China)
出处
《延边大学学报（自然科学版）》
CAS
2019年第4期303-307,共5页
Journal of Yanbian University（Natural Science Edition）
基金
国家自然科学基金资助项目(21565027)
关键词
碳点
甘薯
水热法
荧光猝灭
Fe3+检测
carbon dots
sweet potato
hrdrothermal method
fluorescence quenching
Fe3+ detection
