摘要
以对苯二胺为碳源,乙醇为溶剂,采用溶剂热法合成红色荧光碳点(R-CDs)。通过透射电子显微镜、紫外可见吸收光谱(UV-Vis)、红外光谱(FT-IR)、X射线光电子能谱(XPS)对其进行表征。合成的R-CDs粒径约为(3.63±0.20)nm。R-CDs的最大激发和发射波长分别为480和620 nm,具有激发波长独立性,光稳定性好。基于静态猝灭,R-CDs的荧光可以被过硫酸根(S2O8^2-)有效猝灭。在2.5~120μmol/L范围内,S2O2-8的浓度与R-CDs的荧光猝灭程度呈线性关系,相关系数(R^2)为0.9970,检出限为1.2μmol/L,具有良好的选择性和高灵敏度。同时,该荧光传感体系可应用于自来水和湖水样品中S2O8^2-的检测。
Red fluorescent carbon dots(R-CDs)were synthesized by one-step solvothermal method by using p-phenylenediamine and ethanol.The synthesized R-CDs were characterized by transmission electron microscopy(TEM),ultraviolet-visible spectroscopy(UV-Vis),Fourier transform infrared spectroscopy(FTIR),X-ray photoelectron spectroscopy(XPS)and fluorescence spectroscopy,respectively.The results indicate that the R-CDs are uniform with an average size of(3.63±0.20)nm.Abundant groups like hydroxyl and amine groups are linked on the surface of the synthesized R-CDs.The as-prepared R-CDs show excitation-independent property and the maximum excitation and emission wavelengths are 480 and 620 nm,respectively.Based on static quenching between R-CDs and persulfate,the fluorescence of R-CDs could be effectively quenched by persulfate.A fluorescent strategy is developed for detection of persulfate.The method showed a linear range of 2.5~120μmol/L with a correlation coefficient(R 2)of 0.9970.The limit of detection was 1.2μmol/L,showing excellent sensitivity and selectivity.Meanwhile,the as-proposed sensing system is successfully applied to the analysis of persulfate in tap water and lake water samples with satisfactory results.
作者
孟雅婷
焦媛
张羱
高艺芳
路雯婧
刘洋
董川
MENG Yating;JIAO Yuan;ZHANG Yuan;GAO Yifang;LU Wenjing;LIU Yang;DONG Chuan(Institute of Environmental Science,and School of Chemistry and Chemical Engineering,Shanxi University,Taiyuan 030006,China)
出处
《应用化学》
CAS
CSCD
北大核心
2020年第6期719-725,共7页
Chinese Journal of Applied Chemistry
基金
国家自然科学基金(21874087,21475080,21575084)资助项目。
关键词
红色碳点
合成
荧光猝灭
过硫酸根
red carbon dots
synthesis
fluorescence quenching
persulfate
