水溶性氮掺杂石墨烯量子点的合成及其对Pb2+的选择性识别研究

doi:10.7517/j.issn.1674-0475.2018.01.011

摘要/Abstract

摘要： 以氧化剥离碳纤维法制备的石墨烯量子点（GQDs）为原料，以N，N-二甲基甲酰胺（DMF）为氮源和溶剂，采用溶剂热法，制备了氮掺杂的水溶性石墨烯量子点（N-GQDs）。当反应时间小于24 h时，N-GQDs的氮掺杂量和发光量子效率随反应时间的延长而增大，同时其荧光颜色逐渐从黄色向绿、蓝转变。N-GQDs的发光量子效率最高可从GQDs的4.0%增加到30.1%。氮掺杂一方面增加了N-GQDs中C—N键含量，另一方面增强了N-GQDs的结构有序性，从而提高了其发光量子效率。作为荧光探针，N-GQDs对水溶液中的Pb²⁺具有良好的识别作用。荧光滴定实验证明，在8.0×10^-7 mol/L~1.5×10^-4 mol/L的线性范围内，以N-GQDs为荧光探针，可以有效测定水溶液中Pb²⁺的浓度。与未掺杂的GQDs相比，氮掺杂显著提高了石墨烯量子点对Pb²⁺的选择性。

关键词: 氮掺杂石墨烯量子点, 铅离子识别, 荧光探针, 溶剂热合成

Abstract: In this paper, a facile approach for producing the nitrogen doped graphene quantum dots (N-GQDs) was carried out through solvothermal treatment. The graphene quantum dots (GQDs) derived from carbon fibers in N,N-dimethylformamide. The nitrogen content and the fluorescent quantum yield (QY) could be enhanced by prolonging the reaction time, and simultaneously the fluorescent color of the N-GQDs changed from orange to green and blue. Compared with low QY of 4.0% of GQDs, high QY of 30.1% could be reached by the blue fluorescent N-GQDs with the nitrogen content of 7.7% with solvothermal treatment of 24 h. Doping with nitrogen not only increase the content of C-N bonds, but also enhance the order of the structure, thus inceasing the fluorescent QY of N-GQDs. As a fluorescent probe, the N-GQDs could selectively detect the Pb²⁺ in aqueous solution. The N-GQDs fluorescence probe could be used to determine the level of Pb²⁺ in water sample in the range of 8.0×10^-7 mol/L to 1.5×10^-4 mol/L. Compared with the GQDs, the selectivity of the N-GQDs to Pb²⁺ was enhanced by the nitrogen doping.

Key words: nitrogen doped graphene quantum dot, recognition of Pb²⁺, fluorescence probe, solvothermal

邱申保, 王素敏, 王奇观, 尚嘉茵, 张文治, 杨磊, 樊亚茹. 水溶性氮掺杂石墨烯量子点的合成及其对Pb²⁺的选择性识别研究[J]. 影像科学与光化学, 2018, 36(1): 108-116.

QIU Shenbao, WANG Sumin, WANG Qiguan, SHANG Jiayin, ZHANG Wenzhi, YANG Lei, FAN Yaru. Synthesis of Water Soluble Nitrogen-doped Graphene Quantum Dots and Its Fluorescence Recognition of Pb²⁺[J]. Imaging Science and Photochemistry, 2018, 36(1): 108-116.

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水溶性氮掺杂石墨烯量子点的合成及其对Pb²⁺的选择性识别研究

Synthesis of Water Soluble Nitrogen-doped Graphene Quantum Dots and Its Fluorescence Recognition of Pb²⁺

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