以甘蔗渣为初始碳源制备生物质碳量子点,探究其对金属离子检测情况。采用原位掺杂一步水热法制备出掺杂氮的碳量子点,通过紫外-可见光谱、荧光光谱、X射线衍射、傅里叶红外光谱和原子力显微镜表征碳量子点,稳态/瞬态荧光光谱测定碳量子点绝对量子产率和荧光寿命。结果表明:制备的碳量子点尺寸约为10nm,绝对量子产率为1.69%,在波长365nm紫外灯照射下呈现蓝色荧光,其最大激发波长为330nm,发射波长为417nm。碳量子点对Fe3+呈现出敏感性,当Fe3+浓度小于1mmol/L时,其对碳量子点的淬灭为Lineweaver-Burk静态淬灭。可为甘蔗渣制备碳量子点及后续进一步研究其金属离子检测提供了一定的基础。
Sugarcane bagasse was used as a initial carbon source to prepare biomass carbon quantum dots (CQDs).Nitrogen-doped CQDs were further produced by in situ doping one-step hydrothermal method.The carbon quantum dots were characterized by ultraviolet visible spectroscopy,fluorescence spectroscopy,X-ray diffraction,Fourier transform infrared spectroscopy and atomic force microscopy.Steady-state/transient fluorescence spectra was taken to measure the quantum yield and fluorescence lifetime of the CQDs.The experimental results showed that the particle size of CQDs was about 10nm and the absolute quantum yield was 1.69%.Under the UV lamp irradiation at 365nm,the maximum excitation wavelength and its emission wavelength were 330nm and 417nm,respectively,which presented blue fluorescence CQDs displayed sensitivity to Fe3+.When the Fe3+ concentration was less than 1mmol/L,the quenching was Lineweaver-Burk static quenching.This study provided a certain basis for the preparation of CQDs from biomass raw materials and their application in detecting metal ions.
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基金资助
广西生物多糖分离纯化及改性研究平台建设项目(桂科ZY18076005);广西重点研发计划项目(桂科AB1850036);广西研究生教育创新计划项目(YCSW2021155);广西民族大学2020年大学生创新创业训练项目(202010608092)
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