A simple one-pot synthesis of highly fluorescent nitrogen-doped graphene quantum dots for the detection of Cr(VI) in aqueous media

被引:124
作者
Cai, Fei [1 ]
Liu, Xidong [2 ]
Liu, Shuang [2 ]
Liu, Hong [3 ]
Huang, Yuming [1 ]
机构
[1] Southwest Univ, Coll Chem & Chem Engn, Minist Educ, Key Lab Luminescent & Real Time Analyt Chem, Chongqing 400715, Peoples R China
[2] Chongqing Univ Arts & Sci, Coll Mat & Chem Engn, Chongqing 402160, Peoples R China
[3] Chinese Acad Sci, Chongqing Inst Green & Intelligent Technol, Chongqing 400714, Peoples R China
关键词
CHROMIUM; SPECIATION; ROUTE; YIELD;
D O I
10.1039/c4ra09320h
中图分类号
O6 [化学];
学科分类号
070301 [无机化学];
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.
引用
收藏
页码:52016 / 52022
页数:7
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