碳量子点的绿色合成及其与Fe~(3+)的相互作用
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摘要
本实验通过水热合成法,采用生物质废弃物地瓜皮作为碳源,制备出一种简单、绿色、低成本、良好荧光性能的碳量子点(CQDs)。通过高分辨透射电镜(HRTEM)、X射线光电子能谱(XPS)、傅里叶变换红外光谱(FT-IR)、荧光光谱对碳量子点的光学性能和所含元素、官能团等进行表征。应用荧光猝灭法,研究溶液状态下Fe~(3+)和碳量子点的相互作用,以及pH、时间、温度等诸多因素对二者相互作用的影响,并在此基础上对二者相互作用的机理进行了分析研究。Fe~(3+)对碳量子点有明显的猝灭作用,其二者的猝灭机理为静态猝灭,热力学研究结果显示二者的猝灭过程是自发进行的。
In this work,a kind of simple,green,low cost hydrothermal method was used to prepare carbon quantum dots with good fluorescence by using the biomass waste-ground melon skin as carbon source.The optical properties and elements,functional groups and other structural characteristics of the carbon quantum dots were characterized by high resolution transmission electron microscopy(HRTEM),X-ray photoelectron spectrometer(XPS),Fourier infrared transform spectrometer(FT-IR)and fluorescence spectrum.The interaction of Fe~(3+)and carbon quantum dots were studied by fluorescence quenching method and some factors influencing the interaction,such as pH,time,temperature and so on were also investigated.On the basis of this,the mechanism of the interaction was analyzed.The results show that iron ion has obvious quenching effect on the carbon quantum dots,the quenching mechanism is static quenching,and the thermodynamic results further indicate that the quenching process is spontaneous.
In this work,a kind of simple,green,low cost hydrothermal method was used to prepare carbon quantum dots with good fluorescence by using the biomass waste-ground melon skin as carbon source.The optical properties and elements,functional groups and other structural characteristics of the carbon quantum dots were characterized by high resolution transmission electron microscopy(HRTEM),X-ray photoelectron spectrometer(XPS),Fourier infrared transform spectrometer(FT-IR)and fluorescence spectrum.The interaction of Fe~(3+)and carbon quantum dots were studied by fluorescence quenching method and some factors influencing the interaction,such as pH,time,temperature and so on were also investigated.On the basis of this,the mechanism of the interaction was analyzed.The results show that iron ion has obvious quenching effect on the carbon quantum dots,the quenching mechanism is static quenching,and the thermodynamic results further indicate that the quenching process is spontaneous.
引文
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