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以太西煤为碳源,采用硝酸氧化法辅助水热合成了具有绿色荧光的碳量子点(CDs).该量子点具有良好的稳定性和水分散性,平均尺寸为3.64nm.通过透射电子显微镜(TEM)、X射线光电子能谱仪(XPS;)、傅立叶红外光谱仪(FTIR)、紫外-可见吸收光谱仪(UV-Vis)、荧光光谱仪等对碳量子点的结构和光学性能进行表征.基于荧光猝灭原理,在最优检测条件下,Fe3+在0.6x10-6～2.5x10-6 mol/L及3.0x10-6～21.0 x 10-6 mol/L浓度范围内与CDs的荧光猝灭效率呈良好的线性关系,Fe3+的检出限为6.7 x10-7 mol/L.“,”Carbon quantum dots(CDs) with green fluorescence were synthesized by nitric acid oxidation and hydrothermal method with Taixi coal as carbon source. The CDs had good stability and water dispersibility with an average diameter of 3.64 nm. The structures and optical properties of the CDs were characterized by transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), UV-Vis spectroscopy and fluorescence spectroscopy. Based on the fluorescence quenching principle, the fluorescence intensity of CDs decreased with the increase of Fe3+ concentration under the optimal detection conditions. The fluorescence quenching efficiency of CDs was in good linearity with Fe + in the concentration ranges of 0.6 x10-6-2. 5 x10-6mol/L and 3.0 x 10-6-21.0 x 10-6 mol/L, and the detection limit for Fe3 + was 6. 7 x 10-7 mol/L.