以生姜为原料,采用水热法制备了荧光碳量子点(CQD)。通过透射电镜(TEM)、X射线光电子能谱(XPS)、红外光谱(FT-IR)、荧光光谱以及紫外吸收光谱(UV-Vis)等手段对制备的CQD进行了表征,探索了CQD对MnO-4的检测。结果表明:在180℃,12h的条件下制备的生姜CQD的平均粒径为2.4nm,且具有很好的分散性。CQD的荧光可被MnO-4有效猝灭,且猝灭程度与MnO-4浓度在0~1000μmol/L范围内呈良好的线性关系,R2=0.991,检测限低至0.059μmol/L。将此CQD用于环境水样中MnO-4的检测,回收率为94.72%~113.36%,结果较好。所建立的荧光方法具有简单、分析速度快、选择性好和成本低的优点。
Fluorescent carbon quantum dots (CQD) were prepared from ginger by hydrothermal method.The prepared CQD were characterized by TEM,XPS,FT-IR,fluorescence spectrometer and UV absorption spectrum,and the detection of MnO-4 by CQD was further explored.The results showed that the average particle size of ginger CQD prepared at 180℃ for 12h was 2.4nm with good dispersion.The fluorescence of CQD could be effectively quenched by MnO-4,and the quenching degree was linear with the concentration of MnO-4 in the range of 0~1000μmol/L with R2 of 0.991 and low detection limit of 0.059 μmol/L.The CQD was applied to the determination of MnO-4 in environmental water samples,and the recoveries ranged from 94.72% to 113.36%.The established fluorescence method had the advantages of simplicity,fast analysis speed,good selectivity and low cost.
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基金资助
国家自然科学基金(32160414、21961036和31971741)
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