Data from: Detection for nitrite based on fluorescent carbon dots by hydrothermal method with folic acid

A fluorescent carbon dots probe for detection of aqueous nitrite was fabricated by a one-pot hydrothermal method and the transmission electron microscope, X-ray diffractometer, UV-Vis absorption spectrometer and fluorescence spectrophotometer were used to study the property of carbon dots. The fluorescent property of carbon dots influenced by concentration of aqueous nitrite was studied. The interaction between the electron-donating functional groups and the electron-accepting nitrous acid could account for the quenching effect on carbon dots by adding aqueous nitrite. The products of the hydrolization of aqueous nitrite performed stronger quenching effect at lower pH. The relationship between the relative fluorescence intensity of carbon dots and the concentration of nitrite was described by the Stern-Volmer equation (I0/I-1=0.046[Q]) with a fine linearity (R2=0.99). The carbon dots-based probe provides a convenient method for the detection of nitrite concentration.本研究通过一步水热法制备了一种用于检测水溶液中亚硝酸盐的荧光碳点（carbon dots）探针；随后采用透射电子显微镜（transmission electron microscope, TEM）、X射线衍射仪（X-ray diffractometer, XRD）、紫外-可见吸收光谱仪（UV-Vis absorption spectrometer）以及荧光分光光度计（fluorescence spectrophotometer），对所制备碳点的性能展开研究。探究了水溶液中亚硝酸盐浓度对碳点荧光性能的影响。研究发现，碳点表面供电子官能团与受电子型亚硝酸之间的相互作用，可合理解释加入水溶液亚硝酸盐后引发的碳点荧光猝灭效应。亚硝酸盐水解产物在较低pH条件下展现出更强的荧光猝灭效果。碳点的相对荧光强度与亚硝酸盐浓度之间的关系符合斯特恩-沃尔默（Stern-Volmer）方程：I0/I - 1 = 0.046[Q]，该方程具有良好的线性相关性（决定系数R²=0.99）。该基于碳点的荧光探针为亚硝酸盐浓度的检测提供了一种便捷的分析方法。