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首页> 外文期刊>RSC Advances >A simple one-pot synthesis of highly fluorescent nitrogen-doped graphene quantum dots for the detection of Cr(VI) in aqueous media
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A simple one-pot synthesis of highly fluorescent nitrogen-doped graphene quantum dots for the detection of Cr(VI) in aqueous media

机译：简单的一锅法合成高荧光氮掺杂石墨烯量子点，用于检测水性介质中的Cr（VI）

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摘要

A new method for selective determination of Cr(VI) in environmental water samples was developed based on its quenching effect on the fluorescent N-doping graphene quantum dots (N-GQDs). The N-GQDs were synthesized by a simple one-step method using citric acid as the carbon source and ammonia as the nitrogen source with a 65% yield, showing that mass production of the N-GQDs is possible. The obtained N-GQDs with oxygen-rich functional groups exhibited a strong blue emission with a quantum yield of 18.6%, which was 7 times greater than that of graphene quantum dots (GQDs). Due to the selective coordination to Cr(VI), the N-GQDs can be used as a green and facile sensing platform for label-free sensitive and selective detection of Cr(VI) ions in aqueous solution and real water samples. Compared to GQDs, the N-GQDs as a fluorescent probe promises much improved selectivity for sensing of Cr(VI). The N-GQDs fluorescence probe shows a sensitive response to Cr(VI) in a wide concentration range of 0-140 mu M with a detection limit of 40 nM. The N-GQDs-based fluorescence method was successfully used to selectively detect Cr(VI), and discriminate it and Cr(III) as well in aqueous samples.
机译：基于其对荧光氮掺杂石墨烯量子点（N-GQDs）的猝灭作用，开发了一种选择性测定环境水样中Cr（VI）的新方法。通过简单的一步法，以柠檬酸为碳源，氨为氮源，合成N-GQD的收率为65％，这表明可以批量生产N-GQD。所获得的具有富氧官能团的N-GQD表现出强蓝色发射，量子产率为18.6％，是石墨烯量子点（GQD）的7倍。由于对Cr（VI）的选择性配位，N-GQD可以用作绿色且便捷的传感平台，用于对水溶液和实际水样品中的Cr（VI）离子进行无标记的灵敏和选择性检测。与GQD相比，作为荧光探针的N-GQD有望大大提高对Cr（VI）的检测选择性。 N-GQDs荧光探针在0-140μM的宽浓度范围内显示出对Cr（VI）的敏感响应，检测极限为40 nM。基于N-GQDs的荧光方法已成功用于选择性检测Cr（VI），并在水性样品中区分出它和Cr（III）。

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