以自然界中生物质为前体合成功能性碳量子点(C-CDs)是一种绿色环保的合成策略。本研究以小茴香阴干草质茎作为碳源,通过简单的一步水热法合成水溶性良好的C-CDs。该C-CDs在紫外灯照射下能够发出明亮的蓝色荧光,最佳激发波长和最佳发射波长分别为381nm和460nm。实验发现,C-CDs具有良好的抗光漂白性,以及优秀的pH稳定性。此外,C-CDs对金属Cr6+具有较高的选择性,在460nm处的荧光强度随Cr6+浓度的增加而降低,具有显著的荧光猝灭效应。C-CDs的荧光猝灭与Cr6+浓度在0～100μmol/L范围内呈线性关系(R2=0.9964),最低检出限为0.30nmol/L。在实际应用中,自来水和湖水中的Cr6+检测回收率在97.1%～100.25%。因此,小茴香C-CDs可作为荧光探针检测Cr6+。
Using biomass in nature as precursors to synthesize functional carbon quantum dots (C-CDs) is a green and environmentally friendly synthesis strategy.In this study,we used the dried grass stems of fennel as a carbon source to synthesize water-soluble C-CDs through a simple one-step hydrothermal method.This C-CDs were able to emit bright blue fluorescence under UV lamp irradiation,and the optimal excitation and emission wavelengths were 381nm and 460nm,respectively.The experimental results showed that the C-CDs had good resistance to photobleaching and excellent pH stability.In addition,the C-CDs had high selectivity for metal Cr6+,and the fluorescence intensity at 460nm decreased gradually with the increase of Cr6+ concentration,exhibiting significant fluorescence quenching effect.The fluorescence quenching of the C-CDs was linearly correlated with Cr6+ concentration in the range of 0～100 μmol/L (R2=0.9964),with a minimum detection limit of 0.30nmol/L.In practical application,the recovery rate of Cr6+ in tap water and lake water was 97.1%～100.25%.Therefore,fennel carbon quantum dots can be used as fluorescent probes to detect Cr6+.
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基金资助
国家重点研发计划(2022YFD1600302);广西科技重大专项(桂科AA22096020);广西植物功能物质与资源持续利用重点实验室项目(FPRU2020-4);桂林师范高等专科学校高层次人才项目(GCC202207)
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