KMS Chongqing Institute of Green and Intelligent Technology, CAS
| A simple one-pot synthesis of highly fluorescent nitrogen-doped graphene quantum dots for the detection of Cr(VI) in aqueous media | |
Cai, Fei1; Liu, Xidong2; Liu, Shuang2; Liu, Hong3 ; Huang, Yuming1
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| 2014 | |
| 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. |
| DOI | 10.1039/c4ra09320h |
| 发表期刊 | RSC ADVANCES
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| ISSN | 2046-2069 |
| 卷号 | 4期号:94页码:52016-52022 |
| 通讯作者 | Huang, YM (reprint author), Southwest Univ, Coll Chem & Chem Engn, Minist Educ, Key Lab Luminescent & Real Time Analyt Chem, Chongqing 400715, Peoples R China. |
| 收录类别 | SCI |
| WOS记录号 | WOS:000344389000027 |
| 语种 | 英语 |
