基于百香果壳的荧光碳量子点的制备及对Fe^(3+)的检测

Preparation of fluorescent carbon quantum dots based on passion fruit shell and application in detection of Fe^(3+)

以百香果壳为原材料,采用水热法合成荧光碳量子点(CQDs),考察了碳量子点(CQDs)对Fe^(3+)的检测效果。利用透射电子显微镜(TEM)、X射线衍射(XRD)、红外光谱仪(FT-IR)、紫外-可见吸收光谱仪、荧光光谱仪等对碳量子点(CQDs)的形貌、结构、基团、光谱特性等进行了表征。结果显示,合成的碳量子点形貌和分散性良好,尺寸约为7 nm。在435 nm的激发波长下,其发射峰位于512 nm处。在反应温度为120℃,反应时间为12 h时,所得到的碳量子点的性能最好。Fe^(3+)对CQDs荧光有明显的猝灭现象,而其他金属离子的加入不会改变CQDs的荧光强度及发射峰位置,说明合成的CQDs可以实现对Fe^(3+)的特异性检测。

Fluorescent carbon quantum dots(CQDs)are synthesized from passion fruit shell by hydrothermal method.The detection effect of carbon quantum dots(CQDS)on Fe^(3+)is evaluated.Transmission electron microscopy(TEM),X-ray diffraction(XRD),FT-IR,UV-Vis absorption spectroscopy and fluorescence spectroscopy are employed to characterize the morphology,structure,groups and spectral characteristics of CQDs.The results show that the synthesized CQDs have good morphology and dispersion,and a size of around 7 nm.Under 435 nm of excitation wavelength,the emission peak is at 512 nm.The synthesized CQDs have the best performance when the reaction temperature is 120℃and the reaction time is 12 h.Fe^(3+)has obvious quenching effect on the fluorescence of CQDS,while the fluorescence intensity and emission peak position of CQDs cannot be changed by the addition of other metal ions,indicating that the synthesized CQDS can achieve the specific detection to Fe^(3+).