通过聚乙二醇功能化钝化的甘蔗废糖蜜石墨烯量子点用于金属离子检测
Cane Molasses Graphene Quantum Dots Passivated by PEG Functionalization for Detection of Metal Ions.
作者信息
Lou Ying, Ji Jianying, Qin Aimiao, Liao Lei, Li Ziyuan, Chen Shuoping, Zhang Kaiyou, Ou Jun
机构信息
Key Lab New Processing Technology for Nonferrous Metals & Materials Ministry of Education, College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, P. R. China.
College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, P. R. China.
出版信息
ACS Omega. 2020 Mar 3;5(12):6763-6772. doi: 10.1021/acsomega.0c00098. eCollection 2020 Mar 31.
Poly(ethylene glycol) passivated graphene quantum dots (PEG-GQDs) were synthesized based on a green and effective strategy of the hydrothermal treatment of cane molasses. The prepared PEG-GQDs, with an average size of 2.5 nm, exhibit a brighter blue fluorescence and a higher quantum yield (QY) (up to approximately 21.32%) than the QY of GQDs without surface passivation (QY = 10.44%). The PEG-GQDs can be used to detect and quantify paramagnetic transition-metal ions including Fe, Cu, Co, Ni, Pb, and Mn. In the case of ethylenediaminetetraacetic acid (EDTA) solution as a masking agent, Fe ions can be well selectively determined in a transition-metal ion mixture, following the lowest limit of detection (LOD) of 5.77 μM. The quenching mechanism of Fe on PEG-GQDs belongs to dynamic quenching. Furthermore, Fe in human serum can be successfully detected by the PEG-GQDs, indicating that the green prepared PEG-GQDs can be applied as a promising candidate for the selective detection of Fe in clinics.
基于对甘蔗糖蜜进行水热处理的绿色有效策略，合成了聚乙二醇钝化的石墨烯量子点（PEG-GQDs）。制备的PEG-GQDs平均尺寸为2.5 nm，与未进行表面钝化的GQDs（量子产率=10.44%）相比，呈现出更亮的蓝色荧光和更高的量子产率（高达约21.32%）。PEG-GQDs可用于检测和定量包括Fe、Cu、Co、Ni、Pb和Mn在内的顺磁性过渡金属离子。在以乙二胺四乙酸（EDTA）溶液作为掩蔽剂的情况下，在过渡金属离子混合物中可以很好地选择性测定Fe离子，最低检测限（LOD）为5.77 μM。Fe对PEG-GQDs的猝灭机制属于动态猝灭。此外，PEG-GQDs能够成功检测人血清中的Fe，这表明绿色制备的PEG-GQDs可作为临床上选择性检测Fe的有前景的候选物。
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